Where do most experimenters fail?

[Kokomoj0]

They do not know how to measure their work.

Digital meters can be notoriously inaccurate for reading complex waveforms when one needs to split hairs.

Now the one thing we know that all these meters can do well is read DC voltage, so why not convert your input and output to a DC voltage?

I use 2 of these circuits, one for the input and one for the output.

First I hook them both up to the input.

Then I use the pots to adjust them to give identical readings.

Then put one on the output.

The 10meg input is high enough so that it is unlikely to load your circuit and sends a sample to the amp, is rectified and converted to DC.

Frankly I never believe peoples experiments out here that use digital meters for that reason. anyway.... hope this helps people get more reliable results.

[toranarod]

rocket science

Thanks for the tip.
but its not rocket science when it will not run its self . you don't need a meter for that?

[Kokomoj0]

sure but how do you know your present mod is any better than your last 5 mods? The wave form changes a bit each time and your digital gives erroneous measurements and ya think you made improvements and its really meter error.

Thats just a down and dirty circuit, can put a ladder of 1% resistors for the Vth to scale the input.

So there is a lot of "in-between" between getting it to work and getting it to work OU. Just trying to save people headaches.