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Old 4th July 2013, 05:25 PM   #21
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Apparently, your meter is not very sensitive. You can improve the sensitivity by using a 1N34 (or similar) germanium diode to feed the meter rather than a silicon diode. Silicon diodes do not conduct until there is about .7 volts across them. Germanium diodes will conduct at a much lower voltage.
You can improve the performance even more by using four 1N34 germanium diodes in a bridge configuration to feed the meter.
Other than that suggestion, you may need to build a buffer stage to feed the meter.
It's possible to build such a stage using a transistor or two. It's easier to use an op-amp.
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Old 4th July 2013, 06:05 PM   #22
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Quote:
Originally Posted by Frank Berry View Post
Other than that suggestion, you may need to build a buffer stage to feed the meter.
It's possible to build such a stage using a transistor or two. It's easier to use an op-amp.
So.....I could have used the original one-trans. circuit (s.Pic) had I just fed it from the output? I think I' ĺl try the germanium diode first.
Happy July 4!
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Old 4th July 2013, 06:17 PM   #23
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The circuit will give you no voltage gain. There are better circuits.
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Old 4th July 2013, 07:19 PM   #24
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For the diode, can I use a Schottky BAT 43?
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Old 6th July 2013, 03:29 PM   #25
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P { margin-bottom: 0.08in; } I tried a 1N60 (1N34 equivalent) diode, meter registers a little earlier but the sound still needs to be turned way up. I'm going to try a bridge with 4 x Schottky's 43/46, they're low-voltage similar to 1N60. Ordered online, wating...............zzzzzzzzzzzzzzz.............. ...
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Old 15th July 2013, 09:05 PM   #26
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Other than that suggestion, you may need to build a buffer stage to feed the meter.
It's possible to build such a stage using a transistor or two. It's easier to use an op-amp.
Well I've tried the diode bridge, it didn't bring any improvement, meter still only registers at high volumes. Could you possably point me towards a very simple op-amp circuit that works on 15 volts, no negative rail. I don't need complicated circuitry to calibrate or anything else, as long as it registers at a reasonable level. Much obliged

Last edited by stoppage; 15th July 2013 at 09:07 PM. Reason: grammatical
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Old 15th July 2013, 11:18 PM   #27
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Stoppage, which meters did you get ?.
It may be that they have an internal resistor.....what is the measured resistance of your meters ?.

Dan.
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Old 16th July 2013, 12:17 PM   #28
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Stoppage, which meters did you get ?.
It may be that they have an internal resistor.....what is the measured resistance of your meters ?.

Dan.
The meters are „Mitec Joler“ see Attach.
Measured resistance is 680 Ohms
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File Type: jpg VU Meter Ebay.jpg (135.6 KB, 193 views)
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Old 18th July 2013, 11:21 AM   #29
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Originally Posted by Max Headroom View Post
Stoppage, which meters did you get ?.
It may be that they have an internal resistor.....what is the measured resistance of your meters ?.

Dan.
.....so I take it the measured resistance is o.k., then, or???
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Old 20th July 2013, 12:55 AM   #30
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...is there anybody out there?
Was it something I said?
Hello?
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