Threshold Pot doesn't work

[h9361]

close R10 by wire jumper and try to get working board.

Thanks

[Carl-NC]

After a lot of trying, i found a 32R-0.25W speaker in my country, is it OK?

You can try it but I doubt this will solve your problem. You have something wrong with your circuit. You should be able to drive an 8-ohm speaker and if you cannot then you probably can't drive a 32-ohm speaker, either.

[h9361]

Hello
Dear Carl.
After a lot of trying, i found a 100R speaker, it works and now i can hear audio. But my audio is very unstable so that i have very bad noise when i near my hand to circuit or heatsink-Q3.
In addition, i also have noise when i move my coil in air or up/down over ground, while i tested my circuit in non-motion mode and it was very very stable and it didn't detect any noise or ground field.
Do you think it's normal such noise for VCO version?!

[kt315]

you have not to touch your coil and move it in air because it is NOT SHIELDED. i wrote that million times

[h9361]

you have not to touch your coil and move it in air because it is NOT SHIELDED. i wrote that million times

Thanks, but i have not any problem with non-motion mode! My coil without any shilding was very stable. Do you think noise is different in vco than non-vco?

[surfdetector]

Thanks, but i have not any problem with non-motion mode! My coil without any shilding was very stable. Do you think noise is different in vco than non-vco?

There is no instability in the VCO circuit that I built for the HH1. I built my circuit according to the schematic with no modifications. Please post some clear, high definition photographs of your PCB ( both sides) that you are working on so that we can see what it looks like.

[Carl-NC]

If you are testing indoors then get it outside. Also, you will eventually need a shielded coil.

[kt315]

There is no instability in the VCO circuit that I built for the HH1. I built my circuit according to the schematic with no modifications. Please post some clear, high definition photographs of your PCB ( both sides) that you are working on so that we can see what it looks like.

he uses long unshielded wires to the pots. so he gets much influences and aside noise.
main problem of all beginners is ununderstanding of basic electronics principles.

[h9361]

he uses long unshielded wires to the pots. so he gets much influences and aside noise.
main problem of all beginners is ununderstanding of basic electronics principles.

Thanks dear Kt315.
Today, i ordered the shield wire and will change my wiring to POTs.

[h9361]

If you are testing indoors then get it outside. Also, you will eventually need a shielded coil.

Thanks Dear Carl,
What is interesting is that i tested the Non-VCO version at a place and with a coil, and it was very very stable (actually i enjoyed it)!
I just changed its audio part as VCO and i have very noise and instability at the same place and with the coil!
Off course, my PCB is No-VCO version (Rev C2, Opt 2) and i had to build manually its VCO part (after R36) in a separated board.

[h9361]

Hello
Dear Carl.
I have a request, is it possible to check the 4-sampling (attached)?
Do you see any error?
Thank you.

[Carl-NC]

As far as I can tell it looks like it will work. You will need to adjust RC values to get the right timing delays. Don't ask me what they need to be because I don't know, that's something you'll have to figure out.

[h9361]

As far as I can tell it looks like it will work. You will need to adjust RC values to get the right timing delays. Don't ask me what they need to be because I don't know, that's something you'll have to figure out.

Thanks dear Carl.
I'm going to find the RC values with tests. But before doing, i need to be sure from correctness of my schematic.

[Carl-NC]

As far as I can tell it looks like it will work.

[h9361]

As far as I can tell it looks like it will work.

Hello
Dear Carl.
As you know, your main sample delay is 10 - 75 us. I want to decrease its range to 10-35.
Do you think i can do it if i change R42 pot from 10K to 5K?
Thanks.