Voodoo Main Discussion

[ivconic]

I also have 4 questions for Don, i put circles on schematic where i need clarifications.
Corrected:

[dfbowers]

You can remove the 1k resistor.. just a leftover from a previous drawing. It works without an offset because it get filtered out later on but good idea to add one. The other two, I Donno but will check my original board.
also, playing around, its best to keep the sample width a little smaller. I changed R47 from 22k to 15k.

[ivconic]

Done:

[surfdetector]

You can remove the 1k resistor.. just a leftover from a previous drawing. It works without an offset because it get filtered out later on but good idea to add one. The other two, I Donno but will check my original board.
also, playing around, its best to keep the sample width a little smaller. I changed R47 from 22k to 15k.

Could R47 be a Pot instead?

[6666]

Done:
[ATTACH]54139[/ATTACH]

Great work, for U1, I would use a normal 555 with a 100uF across it.

[dfbowers]

Yes.. that would be a great idea. If nothing else this has been a fun experiment, I will probably try to move everything off my breadboard onto a copper version next and try real world. Also looking forward to assembling the VooDoo!

[6666]

Don, I would have expected a capacitor after the CD4066B to hold the sampled voltage; it's really missing?

Hi Don, did you catch this question ?

[dfbowers]

Hi Don, did you catch this question ?

Work fine without one. It?s getting averaged out but ideally should have one.

[6666]

Work fine without one. It?s getting averaged out but ideally should have one.

Thanks.

[Altair]

Work fine without one. It?s getting averaged out but ideally should have one.

Ivconic, I think is better left space for a capacitor on PCB (if you agree)

[ivconic]

Ivconic, I think is better left space for a capacitor on PCB (if you agree)

No sweat:

[green]

No sweat:

[ATTACH]54142[/ATTACH]

What does C31 do?

[ivconic]

What does C31 do?

Don, I would have expected a capacitor after the CD4066B to hold the sampled voltage; it's really missing?

I put 100nF, it can be higher value.

[ivconic]

What does C31 do?

U2b,R24,C31 = Sample And Hold, SAH.
Although i am not sure about the value.
100nF shall do.
So C31 is "Hold capacitor".

[6666]

No sweat:

[ATTACH]54142[/ATTACH]

Could you also include a series idiot diode in power line , needs slightly bigger holes thanks