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I would ask the same. The first asset of voltages all seem good.? The higher the stages the less current available thus the Meter can load it down.? I have fluke 87 that has a 20M input impedance.? I’ll measure full set of voltages later today and post.? If you boaught the JLI board there is a test point that should be about 80VDV. That is before a final RC filter that has a 1M resistor in it. ?

Best Regards,

Jules Ryckebusch?

On Apr 9, 2022, at 10:39, Jerry Lee Marcel <jerryleemarcel@...> wrote:

?

What are you using to measure the voltage?
It is essential to use a high impedance meter (at least 10 Megohms)

Le 09/04/2022 à 16:09, londekpolska@... a écrit?:

Hello,
I am currently going through mental breakdown because of this circuit! I have no idea why it's not working, I'm beginner with electric circuits, simply following guides out there, schematics, so incase you want to help me out, please keep that in mind.
Circuit is giving me only 32V on last diode, all my connections are good, I've replaced diodes 2 times and IC itself 3 times, trying 2 different models. I am currently using CD40100BE IC, same that is in instructables guide, previously I've tried MC14584BDR2G.

I have also measured voltages throughout whole circuit.

All voltages are referenced to ground.

I think the problem is that 7V here is detected as HIGH by IC and being inverted back to 0V, but then why people didn't have problems like this before?
And how can I solve it once for all.

Voltage from Alice zeners is 12.33V (previously on 200V range it measured 12.2V, thats the reason why it's different in graphic)
Both XLR pins measure 20.9V

^^^^ All voltages here were measured with DC setting on multimeter

Thanks for any advice
Wiktor Molak