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#1




Driving headphones from amplifier speaker terminals
I would like to drive Sennheiser HD 580 headphone from the speaker terminals
of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention is to wire resistors in series across the outputs of the amp to limit the voltage to the headphones thereby assuring that the headphones will not be over driven and the volume control will operate in a reasonable range. The output voltage of the amp should be about 31 volts (120 W into 8 ohms). If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across the speaker terminals, the total output power of the amp would be about 24 watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 watts) to dissipate the power and would provide about 6 volts across each resistor. Connecting the headphones across one of the resistors would provide a maximum of about 6 volts to drive the headphones. This configuration would result in a maximum power of about 120 mW (6 volts into 300 ohms) which should be plenty of power without the likelihood of destroying the headphones. The reason I chose 4 10 ohm resistors is that this value and power rating is easy to find and cheap (Radio Shack). I could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but the power rating of each resistor would have to be at least 30 watts (preferably 40 or 50) which would probably be expensive and require heat sinks. I'm assuming that the amp will perform as well into 40 ohms (or any load as long as the power output is adequate  how about 1 watt into 1 kohm?) as it will into 8 ohms (?). I know this project is trivial to most of the people on this group but I would just like some confirmation that my plan is reasonable. Thanks John 
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#2




Driving headphones from amplifier speaker terminals
"John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). 120W is probably an RMS value. This is the amount of power that the amplifier is able to put out continously. The actual power that the amplifier puts out with a speaker load is usually far less, perhaps only a watt or so. I think that you are making this too complicated. Here is what I would do: go to radio shack and get an audio taper (i.e. logrithmic) potentiomiter and put it in SERIES with the headphones. Turn the volume all the way down on both the pot and the amp and then adjust both until you get the level you want. The pot should let you adjust the volume over a usable range. Just be careful! You might also try adding a current limiting resistor, say, starting with 10k ohms, in serise with the pot just to be safe when you first try this. Maybe you could try this first with a $2 pair of head phones and then use your Sennheisers. > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#3




Driving headphones from amplifier speaker terminals
"John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). 120W is probably an RMS value. This is the amount of power that the amplifier is able to put out continously. The actual power that the amplifier puts out with a speaker load is usually far less, perhaps only a watt or so. I think that you are making this too complicated. Here is what I would do: go to radio shack and get an audio taper (i.e. logrithmic) potentiomiter and put it in SERIES with the headphones. Turn the volume all the way down on both the pot and the amp and then adjust both until you get the level you want. The pot should let you adjust the volume over a usable range. Just be careful! You might also try adding a current limiting resistor, say, starting with 10k ohms, in serise with the pot just to be safe when you first try this. Maybe you could try this first with a $2 pair of head phones and then use your Sennheisers. > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#4




Driving headphones from amplifier speaker terminals
"John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). 120W is probably an RMS value. This is the amount of power that the amplifier is able to put out continously. The actual power that the amplifier puts out with a speaker load is usually far less, perhaps only a watt or so. I think that you are making this too complicated. Here is what I would do: go to radio shack and get an audio taper (i.e. logrithmic) potentiomiter and put it in SERIES with the headphones. Turn the volume all the way down on both the pot and the amp and then adjust both until you get the level you want. The pot should let you adjust the volume over a usable range. Just be careful! You might also try adding a current limiting resistor, say, starting with 10k ohms, in serise with the pot just to be safe when you first try this. Maybe you could try this first with a $2 pair of head phones and then use your Sennheisers. > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#5




Driving headphones from amplifier speaker terminals
"John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). 120W is probably an RMS value. This is the amount of power that the amplifier is able to put out continously. The actual power that the amplifier puts out with a speaker load is usually far less, perhaps only a watt or so. I think that you are making this too complicated. Here is what I would do: go to radio shack and get an audio taper (i.e. logrithmic) potentiomiter and put it in SERIES with the headphones. Turn the volume all the way down on both the pot and the amp and then adjust both until you get the level you want. The pot should let you adjust the volume over a usable range. Just be careful! You might also try adding a current limiting resistor, say, starting with 10k ohms, in serise with the pot just to be safe when you first try this. Maybe you could try this first with a $2 pair of head phones and then use your Sennheisers. > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#6




Driving headphones from amplifier speaker terminals
John Richards....
Your assumption about the value of the resistors is a little low but OK but you do not need the big 40 Watt power rating in the headphone series resistors. Generally, all you would require is one 220 ohm @ 1 or 2 watt series resistor in each channel. In addition, the value of the resistor can be juggled quite a bit too...... I just pulled schematics from a half dozen Stereo Receivers here at my shop.... Yamahas, Kenwood, Denon, etc...... values from 68 to 360 ohms were found, most were usually @ 1 Watt except for one older Sony 75 watt per channel unit which used a 2 watt resistor rating. The 220 ohm @ 1 Watt resistor value was found in a 100 watt per channel Yamaha. The head phones at 300 ohms in series with a 220 ohm resistor will provide an amplifier load of about 520 ohms per channel..... this won't allow the amp output stages to work very hard and the relatively high resistance holds down the current to low levels.....unlike driving full power into 8 ohm speaker loads where higher current will be required and heat will be produced in the power output stages. The max instantaneous power rating just in the headphones series resistors is less than 1 watt each.... and that's at your 120 Watt output..... which you would never be anywhere near that high level, especially with headphones on . Watch your wiring and be careful that you do not accidentally short the speaker terminals..... solid state amps will try to deliver the maximum amount of current into a load..... and a low ohm or dead short will allow destructive currents in the power output stages.  Best Regards, Daniel Sofie Electronics Supply & Repair                                     "John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#7




Driving headphones from amplifier speaker terminals
John Richards....
Your assumption about the value of the resistors is a little low but OK but you do not need the big 40 Watt power rating in the headphone series resistors. Generally, all you would require is one 220 ohm @ 1 or 2 watt series resistor in each channel. In addition, the value of the resistor can be juggled quite a bit too...... I just pulled schematics from a half dozen Stereo Receivers here at my shop.... Yamahas, Kenwood, Denon, etc...... values from 68 to 360 ohms were found, most were usually @ 1 Watt except for one older Sony 75 watt per channel unit which used a 2 watt resistor rating. The 220 ohm @ 1 Watt resistor value was found in a 100 watt per channel Yamaha. The head phones at 300 ohms in series with a 220 ohm resistor will provide an amplifier load of about 520 ohms per channel..... this won't allow the amp output stages to work very hard and the relatively high resistance holds down the current to low levels.....unlike driving full power into 8 ohm speaker loads where higher current will be required and heat will be produced in the power output stages. The max instantaneous power rating just in the headphones series resistors is less than 1 watt each.... and that's at your 120 Watt output..... which you would never be anywhere near that high level, especially with headphones on . Watch your wiring and be careful that you do not accidentally short the speaker terminals..... solid state amps will try to deliver the maximum amount of current into a load..... and a low ohm or dead short will allow destructive currents in the power output stages.  Best Regards, Daniel Sofie Electronics Supply & Repair                                     "John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#8




Driving headphones from amplifier speaker terminals
John Richards....
Your assumption about the value of the resistors is a little low but OK but you do not need the big 40 Watt power rating in the headphone series resistors. Generally, all you would require is one 220 ohm @ 1 or 2 watt series resistor in each channel. In addition, the value of the resistor can be juggled quite a bit too...... I just pulled schematics from a half dozen Stereo Receivers here at my shop.... Yamahas, Kenwood, Denon, etc...... values from 68 to 360 ohms were found, most were usually @ 1 Watt except for one older Sony 75 watt per channel unit which used a 2 watt resistor rating. The 220 ohm @ 1 Watt resistor value was found in a 100 watt per channel Yamaha. The head phones at 300 ohms in series with a 220 ohm resistor will provide an amplifier load of about 520 ohms per channel..... this won't allow the amp output stages to work very hard and the relatively high resistance holds down the current to low levels.....unlike driving full power into 8 ohm speaker loads where higher current will be required and heat will be produced in the power output stages. The max instantaneous power rating just in the headphones series resistors is less than 1 watt each.... and that's at your 120 Watt output..... which you would never be anywhere near that high level, especially with headphones on . Watch your wiring and be careful that you do not accidentally short the speaker terminals..... solid state amps will try to deliver the maximum amount of current into a load..... and a low ohm or dead short will allow destructive currents in the power output stages.  Best Regards, Daniel Sofie Electronics Supply & Repair                                     "John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#9




Driving headphones from amplifier speaker terminals
John Richards....
Your assumption about the value of the resistors is a little low but OK but you do not need the big 40 Watt power rating in the headphone series resistors. Generally, all you would require is one 220 ohm @ 1 or 2 watt series resistor in each channel. In addition, the value of the resistor can be juggled quite a bit too...... I just pulled schematics from a half dozen Stereo Receivers here at my shop.... Yamahas, Kenwood, Denon, etc...... values from 68 to 360 ohms were found, most were usually @ 1 Watt except for one older Sony 75 watt per channel unit which used a 2 watt resistor rating. The 220 ohm @ 1 Watt resistor value was found in a 100 watt per channel Yamaha. The head phones at 300 ohms in series with a 220 ohm resistor will provide an amplifier load of about 520 ohms per channel..... this won't allow the amp output stages to work very hard and the relatively high resistance holds down the current to low levels.....unlike driving full power into 8 ohm speaker loads where higher current will be required and heat will be produced in the power output stages. The max instantaneous power rating just in the headphones series resistors is less than 1 watt each.... and that's at your 120 Watt output..... which you would never be anywhere near that high level, especially with headphones on . Watch your wiring and be careful that you do not accidentally short the speaker terminals..... solid state amps will try to deliver the maximum amount of current into a load..... and a low ohm or dead short will allow destructive currents in the power output stages.  Best Regards, Daniel Sofie Electronics Supply & Repair                                     "John Richards" > wrote in message news > I would like to drive Sennheiser HD 580 headphone from the speaker terminals > of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, > power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention > is to wire resistors in series across the outputs of the amp to limit the > voltage to the headphones thereby assuring that the headphones will not be > over driven and the volume control will operate in a reasonable range. > > The output voltage of the amp should be about 31 volts (120 W into 8 ohms). > If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across > the speaker terminals, the total output power of the amp would be about 24 > watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 > watts) to dissipate the power and would provide about 6 volts across each > resistor. Connecting the headphones across one of the resistors would > provide a maximum of about 6 volts to drive the headphones. This > configuration would result in a maximum power of about 120 mW (6 volts into > 300 ohms) which should be plenty of power without the likelihood of > destroying the headphones. The reason I chose 4 10 ohm resistors is that > this value and power rating is easy to find and cheap (Radio Shack). I > could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but > the power rating of each resistor would have to be at least 30 watts > (preferably 40 or 50) which would probably be expensive and require heat > sinks. I'm assuming that the amp will perform as well into 40 ohms (or any > load as long as the power output is adequate  how about 1 watt into 1 > kohm?) as it will into 8 ohms (?). > > I know this project is trivial to most of the people on this group but I > would just like some confirmation that my plan is reasonable. > > Thanks > John > > 
#10




Driving headphones from amplifier speaker terminals
A common practice is to use for each channel in series with the headphones
are a pair of 120 ohm 2 Watt resistors. Each one is for each side of the headphones. The ground is common.  Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoomone.com Electronics http://www.zoomone.com/electron.htm ========================================= "John Richards" > wrote in message news I would like to drive Sennheiser HD 580 headphone from the speaker terminals of a 120 watt amp. The headphones have a nominal impedance of 300 ohms, power handling of .2 watts and sensitivity is 97dB (at 1 mW?). My intention is to wire resistors in series across the outputs of the amp to limit the voltage to the headphones thereby assuring that the headphones will not be over driven and the volume control will operate in a reasonable range. The output voltage of the amp should be about 31 volts (120 W into 8 ohms). If I wire 4 10 ohm, 10 watt resistors in series for a load of 40 ohms across the speaker terminals, the total output power of the amp would be about 24 watts into 40 ohms and should be low enough for the 4 10 watt resistors (40 watts) to dissipate the power and would provide about 6 volts across each resistor. Connecting the headphones across one of the resistors would provide a maximum of about 6 volts to drive the headphones. This configuration would result in a maximum power of about 120 mW (6 volts into 300 ohms) which should be plenty of power without the likelihood of destroying the headphones. The reason I chose 4 10 ohm resistors is that this value and power rating is easy to find and cheap (Radio Shack). I could have used 4 2 ohm resistors to provide an 8 ohm load for the amp but the power rating of each resistor would have to be at least 30 watts (preferably 40 or 50) which would probably be expensive and require heat sinks. I'm assuming that the amp will perform as well into 40 ohms (or any load as long as the power output is adequate  how about 1 watt into 1 kohm?) as it will into 8 ohms (?). I know this project is trivial to most of the people on this group but I would just like some confirmation that my plan is reasonable. Thanks John 
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