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#1
Posted to rec.audio.pro, sci.electronics.equipment, rec.audio.tech,rec.radio.amateur.homebrew, sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (toplug into pc speaker headphone jack)
I would like to build an analog volume meter (moving needle type)
using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? PS I would also be interested in building a frequency meter (also would be plugged into computer speakers and display the pitch/ frequency of a pure sin wave coming from the computer's sound card). I got several replies but they were pretty technical and I have not found any complete plans for such a device. If any can suggest a good web site or book that would be great. Thanks BobG: That's a tachometer. A lo pass filter, a comparator, a oneshot, a capacitor, and a meter on a trimpot. Every zero crossing, the comparator fires the oneshot, the cap integrates the pulses, and the meter shows the freq. Cal it with sine waves.... no harmonics. linnix: Or a $2 micro averaging the DCT, FFT or XYZ (forgot the name of that spectral analyser). whit3rd: Phase-lock loops like 74HC4046 can lock onto an audio frequency, and the follower in it has an output voltage proportional to frequency. That's about $0.60 from your budget; a good analog moving-needle meter will suck up the rest of it. |
#2
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
wrote in message
... I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. Why do you need this, or think you need this? It might look nice, but will it tell you what you need to know? |
#3
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
wrote ...
I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? It is a pretty simple circuit, but it greatly depends on exactly what your meters are. Get youself a couple of meters first, and then come back and ask specifically for how to hook them up. It would be very helpful to know what they came out of, and for bonus points, the circuit diagram of where they came from. PS I would also be interested in building a frequency meter (also would be plugged into computer speakers and display the pitch/ frequency of a pure sin wave coming from the computer's sound card). I got several replies but they were pretty technical and I have not found any complete plans for such a device. If any can suggest a good web site or book that would be great. Thanks Forget it. It is neither practical nor particularly useful. Unless you can give us a good explanation of what you think you want to do with it, nobody can help you. (posted from rec.audio.tech) |
#4
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
William Sommerwerck wrote:
wrote in message ... I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. Why do you need this, or think you need this? It might look nice, but will it tell you what you need to know? And if you really need an actual VU meter, you won't find it on too many consoles being scavenged these days, sad to say. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
wrote:
I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? How about LED bar-graph VU meter? Fairly easy to make, using these: http://www.national.com/mpf/LM/LM3915.html or http://www.national.com/mpf/LM/LM3916.html Check the full datasheet for example circuits. |
#6
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
wrote in message
... I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? I believe I published a design for a buffered VU meter somewhere around 1993 in Audio Amateur magazine, which is now known as audioXpress. It's really very simple; for an unbalanced line (like the headphone jack) all you need is an opamp (half of a TL072 works fine), a couple of resistors, and a pot to adjust the calibration. Connect the output of the opamp to the VU meter through a 3.62k resistor and you're home free (okay, you need something to power the opamp like a cheap balanced power supply or a couple of 9V batteries). If you have a real VU meter, there you are. Of course, we don't know if your "VU" meter is a real VU meter, which has certain defined ballistics that are specified in ANSI technical standards. Can you tell us from what broken mixer you scavenged the meter? PS I would also be interested in building a frequency meter (also would be plugged into computer speakers and display the pitch/ frequency of a pure sin wave coming from the computer's sound card). I got several replies but they were pretty technical and I have not found any complete plans for such a device. If any can suggest a good web site or book that would be great. Thanks Probably the easiest way to do that is not to build it. Instead, go buy a digital voltmeter (DVM) which has a frequency scale on it. Peace, Paul |
#7
Posted to rec.audio.pro, sci.electronics.equipment, rec.audio.tech,rec.radio.amateur.homebrew, sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter(to plug into pc speaker headphone jack)
On Jan 4, 9:09 pm, dizzy wrote:
wrote: I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? How about LED bar-graph VU meter? Fairly easy to make, using these: For small displays, LED is difficult to have fine resolutions. Color backlite LCD is a much better option. For example: http://linnix.com/lcd-meter.jpg is a color LCD display for one of our customer. You can drive it with an LCD uC running a Goertzel filter on the selected frequency. uC + LCD for $5 in volume. |
#8
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
dizzy wrote:
How about LED bar-graph VU meter? Fairly easy to make, using these: http://www.national.com/mpf/LM/LM3915.html Comes only vaguely close to meeting VU ballistics specs, which can be very annoying at times. Fine for rough work, though. Vellemann makes some inexpensive LED meter kids. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
"Scott Dorsey" wrote in message
... dizzy wrote: How about LED bar-graph VU meter? Fairly easy to make, using these: http://www.national.com/mpf/LM/LM3915.html Comes only vaguely close to meeting VU ballistics specs, which can be very annoying at times. Fine for rough work, though. Vellemann makes some inexpensive LED meter kids. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." If the OP is determined to build something to use his analog meters, I suggest the project at http://sound.westhost.com/project55.htm. Seems to be a reasonable circuit and gives a decent description as well. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) "In theory, there isn't any difference between theory and practice. In practice, there is." - Yogi Berra |
#10
Posted to rec.audio.pro, sci.electronics.equipment, rec.audio.tech,rec.radio.amateur.homebrew, sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter(to plug into pc speaker headphone jack)
On Jan 5, 5:23 pm, "DaveM" wrote:
If the OP is determined to build something to use his analog meters, I suggest the project athttp://sound.westhost.com/project55.htm. Seems to be a reasonable circuit and gives a decent description as well. My humble apologies. I thought I was reading the same question that he asked a few days ago when he wanted to use an analog VU meter to display pitch. I see that here he's looking to display level. Different question, different answer, and this one has an easier answer. |
#11
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
wrote in message ... I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? PS I would also be interested in building a frequency meter (also would be plugged into computer speakers and display the pitch/ frequency of a pure sin wave coming from the computer's sound card). I got several replies but they were pretty technical and I have not found any complete plans for such a device. If any can suggest a good web site or book that would be great. Thanks BobG: That's a tachometer. A lo pass filter, a comparator, a oneshot, a capacitor, and a meter on a trimpot. Every zero crossing, the comparator fires the oneshot, the cap integrates the pulses, and the meter shows the freq. Cal it with sine waves.... no harmonics. linnix: Or a $2 micro averaging the DCT, FFT or XYZ (forgot the name of that spectral analyser). whit3rd: Phase-lock loops like 74HC4046 can lock onto an audio frequency, and the follower in it has an output voltage proportional to frequency. That's about $0.60 from your budget; a good analog moving-needle meter will suck up the rest of it. test |
#12
Posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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seeking schematics or plans to build a stereo analog volume meter (to plug into pc speaker headphone jack)
"Dave" wrote in message news:bBBwj.58078$C61.44082@edtnps89... wrote in message ... I would like to build an analog volume meter (moving needle type) using moving needle gauges like this http://en.wikipedia.org/wiki/Image:VU_Meter.jpg scavenged from a dead mixer's VU meter. It would plug into the headphone jack on a set of computer speakers and monitor the right/left sound volumes independently. Can anyone point me to a good website or book with schematics or plans on building this? PS I would also be interested in building a frequency meter (also would be plugged into computer speakers and display the pitch/ frequency of a pure sin wave coming from the computer's sound card). I got several replies but they were pretty technical and I have not found any complete plans for such a device. If any can suggest a good web site or book that would be great. Thanks BobG: That's a tachometer. A lo pass filter, a comparator, a oneshot, a capacitor, and a meter on a trimpot. Every zero crossing, the comparator fires the oneshot, the cap integrates the pulses, and the meter shows the freq. Cal it with sine waves.... no harmonics. linnix: Or a $2 micro averaging the DCT, FFT or XYZ (forgot the name of that spectral analyser). whit3rd: Phase-lock loops like 74HC4046 can lock onto an audio frequency, and the follower in it has an output voltage proportional to frequency. That's about $0.60 from your budget; a good analog moving-needle meter will suck up the rest of it. test A crystal controlled monostable multivibrator driving an analog meter. that is more like 10 bucks without the meter. It can be calibrated without an input signal. or by inputting a signal beyond its range. Bob Bob |
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