sharkfin IC4 Values

[mrsmith]

Hi, the sample/hold feature setting of my sharkfin is not working; the filter is fine. The sample/hold was working, and I think I blew out IC4. Does anyone have the voltage values for that IC? I'm getting what I think are some weird readings, and I want to compare. Thanks.

[peAk]

I can't get to it now but if someone hasn't helped you by tomorrow, I can get them for you

I am guessing you already tweaked the trim pots?

[mrsmith]

Yes, and I'm not getting any sound out of the sample/hold side.

[mrsmith]

Thanks for your help.

[peAk]

Yes, and I'm not getting any sound out of the sample/hold side.

When I first built it, I had the opposite. My s&h was working but my filter sounded terrible. I reflowed everything and that fixed it.

I can get you those values tomorrow if someone can't help you before then.

Also, you can try slightly twisting your pcb and see if it changes anything.

[mrsmith]

ok, thanks.

[mrsmith]

Both sample/hold and filter settings worked first try, but I was attempting to mend a volume drop in my filter setting and replaced R15 with a 100K resister, which I read about someone trying on this forum. It didn't work, and in the process of the swap, I think I blew out IC4. I'm getting quite different readings between IC4 and IC5 and some "0" and low voltages on IC4 that I don't think are correct.

[peAk]

Hey, not sure if you still need them but I got them for you just in case.

1. 9.07         8. fluctuated
2. 1.2           7. 9.21
3.   0            6. 33.2 mv
4. 9.07         5. 9.07   

Hope this helps

[mrsmith]

Thanks!

[peAk]

No problem, hope you get it working.

I love the Sharkfin. I will say that there is a fairly big volume drop on the sample and hold section...if you haven't already noticed.

[mrsmith]

Mine drops volume on the filter section, and I haven't found a remedy for it yet. It might just be the way it is.

[peAk]

Cortexturizer did some mods one of them being a clean blend/mix that seem to help with his volume drop. I believe though that his volume drop was also on the sample and hold section.

I didn't notice a drop on the filter section on mine.

I just built a Nautilus before the Sharkfin and sometimes I get them confused when I am thinking about the filter.