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#1
Posted to rec.audio.tech
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Resistor Question
Hi all, forgive my lack of electronic knowledge.
My question is, running in parallel with a 47K ohm resistor in a phono stage, what value-final resistance does the addition of these particular resistors now give? 1k ohm? 200 ohm? 100 ohm? Thank you, Mark |
#2
Posted to rec.audio.tech
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Resistor Question
For any 2 resisters in parallel:
Rt = (R1 * R2) / (R1 + R2) But this only works for two resisters at a time. James. ) "Mark D" wrote in message ... Hi all, forgive my lack of electronic knowledge. My question is, running in parallel with a 47K ohm resistor in a phono stage, what value-final resistance does the addition of these particular resistors now give? 1k ohm? 200 ohm? 100 ohm? Thank you, Mark |
#3
Posted to rec.audio.tech
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Resistor Question
Sorry James, but that wasn't what I asked. If I wanted the formula, I
would've asked for that specifically! Can anyone here answer my first question please! Thank you, Mark |
#4
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Sorry James, but that wasn't what I asked. If I wanted the formula, I would've asked for that specifically! Your calculator is broken? Try the windows one, your PC obviously still works. MrT. |
#5
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Hi all, forgive my lack of electronic knowledge. My question is, running in parallel with a 47K ohm resistor in a phono stage, what value-final resistance does the addition of these particular resistors now give? 1k ohm? 200 ohm? 100 ohm? Thank you, Mark Effectively, 1 kOhm 200 Ohm 100 Ohm The 47 K in parallel with these is so much larger the small value resistors predominate. No calculator necessary. Mark Z. |
#6
Posted to rec.audio.tech
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Resistor Question
Thank you Mr T. Anyone else care to chime in? MD
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#7
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Thank you Mr T. Anyone else care to chime in? MD Yep. Are you too lazy to work out the answer yourself from the graciously supplied formula, or do you have a reason why others should do all your menial work for you ? Also the question remains - "Why ?". Do you have an unavoidable shunt resistor on a phono input for some reason ? geoff |
#8
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Thank you Mr T. Anyone else care to chime in? MD What is the tolerance of the resistor values then? MrT. |
#9
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Sorry James, but that wasn't what I asked. If I wanted the formula, I would've asked for that specifically! Can anyone here answer my first question please! Thank you, Mark The effect of your 47K resistor will essentially disappear in the presence of any of those other low-value resistors. |
#10
Posted to rec.audio.tech
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Resistor Question
Thank you Mark, and Richard.
This was the info I basically needed to know to help me understand a bit more. mark |
#11
Posted to rec.audio.tech
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Resistor Question
Yep.
Are you too lazy to work out the answer yourself from the graciously supplied formula, or do you have a reason why others should do all your menial work for you ? Also the question remains - "Why ?". Do you have an unavoidable shunt resistor on a phono input for some reason ? geoff ====================================== And thank you also Geoff for your reply. Nope, not lazy, just a lack of electronical knowledge, and understanding. |
#12
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Nope, not lazy, just a lack of electronical knowledge, and understanding. If you can't figure out how to use the formula provided, don't think about touching a turntable or amplifier's phono stage, you'll probably electrocute yourself or irreparably damage the equipment... if you can figure out which screwdriver fits the screws to get it open in the first place. |
#13
Posted to rec.audio.tech
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Resistor Question
If you can't figure out how to use the formula provided, don't think
about touching a turntable or amplifier's phono stage, you'll probably electrocute yourself or irreparably damage the equipment... if you can figure out which screwdriver fits the screws to get it open in the first place. ====================================== Gee Dave, thanks for the great tips, and advice, especially the important tip on which end of a screwdriver I should maybe try to use! :-) Just for yours, and other's info, the Table is a VPI 19 Mk-IV, with hi-output 1.8Mv Glider Cart (output Impedance is 85ohms), the Phono Stage a McCormack Micro Phono Drive, and I have bought an assortment of 5 watt Metal Film Vishay Resistors, that will run in parallel with the default 47K factory setting. The insertion of add on resistors with this Unit is quite simple in fact with ports to accept them, and even a electronic "dummy" as myself shouldn't have much problems. As I understand, much won't be gained by using resistors below 1000K, and the supposed target range I should try would be around 2.2K. (25X Output Impedance) It is more or less unpredictable which will work best, and it will be trial, and error by ear to ultimately select the right loading for the said MC Cartridge, extracting it's best performance within my system. It is said in general, that hi-output MC's above 1MV generally perform just fine at 47K, but some improvemnts may be had by additional loading. mark |
#14
Posted to rec.audio.tech
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Resistor Question
"Mark D" wrote in message ... Just for yours, and other's info, the Table is a VPI 19 Mk-IV, with hi-output 1.8Mv Glider Cart (output Impedance is 85ohms), the Phono Stage a McCormack Micro Phono Drive, and I have bought an assortment of 5 watt Metal Film Vishay Resistors, that will run in parallel with the default 47K factory setting. The insertion of add on resistors with this Unit is quite simple in fact with ports to accept them, and even a electronic "dummy" as myself shouldn't have much problems. If it was me, I'd simply use a potentiometer for testing, then measure the optimum resistance. It is more or less unpredictable which will work best, Not at all, if measurements are performed. and it will be trial, and error by ear to ultimately select the right loading for the said MC Cartridge, extracting it's best performance within my system. In the absence of any test equipment perhaps. MrT. |