Messages

Hey everyone. I wonder how I can implement an LED indicator that'll "pulsate" (not just go on and off) with the LFO of an LM324 & 13600-based Small Stone. The current layout that I have is just goes hard on and off, I'd prefer more of a fading effect if possible.

Is the polarity of the tantalum cap reversed in the spec in the slurpee doc? That seemed to get me a somewhat functional auto wah. Still doesn't blow me away or sound like some of the bassballs clips I hear online.

Hi, have u got any news on this project?

Morning all,

Last night I finished my 2nd project with great hopes, however all I got was a DI sound mixed with a rather feint hi-freq filtered sound, and nothing else. Pots are not changing anything either. I've followed the below project. Also the dist. switch (which is an on/on, 3-pin switch) totally kills the sound when switched on one side.

http://dirtboxlayouts.blogspot.com/2022/10/electro-harmonix-bassballs-pedalpcb.html

This project seems the same as the schematics on PedalPCB and the one here (Slurpee). The only difference between Slurpee is the 100n cap between + and - lines. There were some flaws with the original stripboard design above , and I fixed them by tracing everything one by one (and reported the author to do so, you can see the dirtbox posts). I'm adding the PDF file I've redrawn, renamed the parts, and proof-traced everything according to Slurpee as attachment just to be clear. Even now, C11&C12 caps should be exchanged with C9&10, but that's not a big deal for now I believe.

I've measured the voltages for both ICs, which are;

IC-1 (MC 1458P)

1- 4,52
2- 4,52
3- 4,42
4- 0
5- 0
6- 7,53
7- 8,54
8- 9,05

IC-2 (JRC 4558)

1- 4,52
2- 4,52
3- 4,51
4- 0
5- 4,53
6- 4,51
7- 4,5
8- 9,05

I assume that the voltages of IC-1's 5-6-7 pins being somehow different than the other one, would be a sign.

I've used 2n5088 transistors (and tried on both ways), not helped. ICs are also the same, and so are the diodes, pots, and everything. The switch is an SPDT on-on.
These are the corrections I've made, yet I got no result.

Here are some pictures (don't mind the 2n2219, the pinout is the same, just there for trial purposes)

https://photos.app.goo.gl/FeRecArThsTEyZnX7

Any help would be most appreciated!