Problem with Dirtbag deluxe VS3205

[marcfrom]

Hi Guys,

I just build a Dirtbag Deluxe with VS3205.

There's Dry signal at the output, but there's no wet signal.

I puted 47K resistors for R11 and R12.

For R21 and C14 i replace both for 100K resistors.

Do i have to ommit D2 and C17 ?

Thanks

Marc

[Scruffie]

This should help - http://www.madbeanpedals.com/forum/index.php?topic=3366.msg29412#msg29412

[marcfrom]

Thank you, It will help to get the best sound when my Dirtbag will be working.

But i have read the entire post and did'nt see anything about D2 and C17.

So, we keep D2 and C17 or not with VS3205 ?

Thanks

[madbean]

Yes, you must use D2 and C17 when building the v3205 version. If you are getting no wet signal, you should audio probe pin7 of IC4 first to make sure you are getting signal to the first BBD. If so, then probe pins3 and 4 while adjusting the BIAS1 trim to see if you are getting the delayed output. Then repeat for IC5.

If you are getting input at IC4 but no output, at that point I suggest taking some voltage readings on it and posting them.

[marcfrom]

Actually,

when i probe at IC2 (NE570) pin 5 and 6 signal is ok, but there is no signal at the output pin 7 .
i mesure 8 volts at pin 13.

So there's no more signal after IC2.

Have you an idea?

Thank you.

[madbean]

If you have signal at pin5, but not pin7 then I would check the following carefully for solder bridges, bad joints, or faultiness: R12, C9 and R13.

[marcfrom]

I have to remove C8 and link with a wire both points of R12 to bring the signal to V3205.

I follow the signal untill the input 14 and 15 of NE570 IC, but there's nothing at pin 10 and 11.

So, i suspect the NE570, it's a NE570N version. Is it ok with it ?

How can i check if this IC is ok? i don't have any spare.

Thank you

Marc

[marcfrom]

Hi have a little time to come back on this project.

There is the signal until between R10/R11, between R11/R12 there is no signal, At R12/R13 the signal comes only when i play strongly but it's saturate.

Have you an idea ?

[marcfrom]

Actually, the saturation is at pin 7 of the NE570