SFX Thumpinator

[mikejoyce]

This would be an awesome addition for all of us bassists.

http://www.musiker-board.de/attachments/f3-musik-instrumente-know-how//f76-bass-forum//f190-effekte-bass//244812d1352336591-sfx-thumpinator-ist-drin-tpn_schematic-incomplete.png

[Silver Blues]

Do you know what C1 to C9 and IC3 are? (I suspect IC3 is a 7660S or one of its equivalents.) I could probably do that if I knew all the values.

[mikejoyce]

Unfortunately, I have no idea what they are. Do you know of any circuits that are similar to this?

[Silver Blues]

Eh... no, not really, sorry  I could try a general layout without knowing the values if you like.

Although I am now sure that IC3 is a 7660s as I checked it against the datasheet.

[Silver Blues]

All right, here's... something, anyway... It's perhaps not quite as graceful as one of Mark or Miro's.



I apologize for that haphazard stack of resistors and caps in the bottom right, but they can all be fit in that space.

[mikejoyce]

Thank you so much!! I've just now found a gutshot, but unfortunately I'm still clueless as to cap values.
http://img856.imageshack.us/img856/7156/1000176x.jpg

[Silver Blues]

Lol yeah, that's not a very useful gut shot... C4 will only be revealed via a test, as those SMD tantalum caps (which I think that is) don't have markings AFAIK. There might be markings on the sides of those box caps but of course the pic is top down

[johnk]

it's the red box caps that are setting the rolloff frequency. looking at the pic, there's two different sized ones.my guess, judging by the resistor values, is that the larger ones are probably close to 100n or thereabouts for a 27Hz high pass..