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Old 2nd April 2013, 04:06 PM   #101
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Any suggestions ?
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Old 3rd April 2013, 11:39 PM   #102
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This is just eye-candy, so it is kind of up to you to figure out how to use whatever meter you happen to find and like. You are probably going to have to find something on eBay or similar. There is software out there to print out new legends for various meter styles.

All D'arsonval meters work on the same principals. They are current measuring devices...usually very low currents. Some sort of shunt or series resistance is required to scale the meter's movement the way you'd like. Most meters that you'll find are roughly similar. A 2V and a 200V meter is usually the same meter with a different series resistor. Meters for measuring current use a shunt instead. Some meters you'll find already have the shunt while others expect you to provide it.

I suggest you use Google and start reading.
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Old 4th April 2013, 12:50 AM   #103
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meterscale software

Meter - meterscale drawing program from Tonne Software
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Old 4th April 2013, 01:48 AM   #104
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Yes, that is the software that Peter Millett used on his power supply.

Also, I should mention that the only time you typically see meters on a power amplifier is to guesstimate power output in Watts (FWIW). So if you assume an 8 ohm load and you want the meter to read full scale at a certain RMS power output, then you can calculate roughly what voltage to setup the meter for...at least for a sine wave.
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Old 10th April 2013, 07:32 PM   #105
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Hi Guys.
Today I checked all the configurations of the Simple SE.
The UL is not working good . When I am configuring to UL I hear whistle like a siren .
Did you heard something like this before ? ( the triode is working OK )
Thanks
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Old 10th April 2013, 08:20 PM   #106
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Sounds like something may be hooked up backwards. Are you using cathode feedback, by chance?
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Old 10th April 2013, 08:28 PM   #107
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I am not sure, when I heard the sound, if I were using CFB or not. Arent they work together?
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Old 10th April 2013, 09:18 PM   #108
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They are two different things, but you typically want to use CFB with UL. For CFB to work, you actually have to invert the phase of the OPT secondaries so that you get negative feedback and not positive feedback. If you get it backwards, your amp becomes an oscillator.
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Old 11th April 2013, 04:02 AM   #109
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As Russ mentioned, you want negative feedback. Positive feedback makes an oscillator that quickly sounds like a siren.....

You may have a polarity reversed somewhere.
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Old 11th April 2013, 02:37 PM   #110
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Hi.
Isn't the CFB switch in charge of inverting the polarity of the OPT's secondaries?
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