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 No sound from theremax 
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Joined: Mon Aug 26, 2013 1:15 am
Posts: 1
Post Re: No sound from theremax
osterac wrote:

I just finished building my theremax kit. When I first tried it I got no sound, so I turned it off and did a visual check. I found a loose capacitor, so I soldered it on, but still no sound. So I followed the troubleshooting steps and found that the voltage was reading 8.5V at R1. There is no smoke, can the theremax handle this? The Vr voltage is 4.2V instead of the listed 4.1V. Is this okay? I get 7.37V from Q1-Q4.

To be clear, as I adjust oscillator coil L3 the gate
led light does turn on and off as the manual says it should. Also, I can get the gate light to respond to me moving my hand closer or farther away from the volume antenna. I sometimes can hear a faint crackling noise as well. I have gone back through the manual and checked every part and connection and I can't find anything wrong with what I did.

What should I do? I'm completely stumped.

Please help


hello friend were you able to build theremax kit? I am working on similar project so can you help me with some sort of circuit diagram

Last edited by MosesHarmon on Wed Aug 28, 2013 10:29 am, edited 1 time in total.

Tue Aug 27, 2013 5:31 am
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Joined: Sun Nov 09, 2008 2:49 pm
Posts: 732
Post Kit and plans for building your own Theremax
The Theremax kit may be purchased here:

To see all that's involved, the manual for the kit is posted here:


Scott Lee

Tue Aug 27, 2013 9:59 am
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