Search found 6 matches

P.S.: In case you may wonder - I omitted the second CV input and the Line/Mic switch, as I'm sure I'd never have used them.

Oh daaaaamn, I finally figured it out!
In case anyone is still reading:

I rebuilt the VCF circuit on a breadboard and... it still didn't work. So I started checking for bad components. Since the s ...

Oops, sorry, of course amp bias pins 1 and 16 stay negative, since they're current biased!

I'm getting closer to the problem it seems: If I just leave out Q1, feed the oscillator and LFO to VCF, se ...

Found the reason for the noise issue - the voltage was too high! I feel so stupid... didn't expect the circuit to be so picky. Now running off a 9V battery, delay/LFO mod works. Still, no sound coming ...

I got a little further:

- if I remove R27, R34 and R22, the voltages get symmetrical, so the voltage drift is due to malfunction of VCF. Still, Im sure that everything between R1/R2 and C3/C4 is as ...

Hi there,

I just built the Echo Rockit, and am having some issues that I can't seem to fix myself! I have a multimeter and a scope.

Input buffer, LFO and oscillator are working fine. However:
...

Author	Message
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Sun Dec 02, 2018 6:23 pm Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	P.S.: In case you may wonder - I omitted the second CV input and the Line/Mic switch, as I'm sure I'd never have used them.
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Sun Dec 02, 2018 6:18 pm Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	Oh daaaaamn, I finally figured it out! In case anyone is still reading: I rebuilt the VCF circuit on a breadboard and... it still didn't work. So I started checking for bad components. Since the s ...
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Thu Nov 08, 2018 6:12 pm Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	Oops, sorry, of course amp bias pins 1 and 16 stay negative, since they're current biased! I'm getting closer to the problem it seems: If I just leave out Q1, feed the oscillator and LFO to VCF, se ...
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Thu Nov 08, 2018 3:34 pm Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	Found the reason for the noise issue - the voltage was too high! I feel so stupid... didn't expect the circuit to be so picky. Now running off a 9V battery, delay/LFO mod works. Still, no sound coming ...
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Thu Nov 08, 2018 1:44 pm Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	I got a little further: - if I remove R27, R34 and R22, the voltages get symmetrical, so the voltage drift is due to malfunction of VCF. Still, Im sure that everything between R1/R2 and C3/C4 is as ...
Topic: Echo Rockit VCF fault... troubleshooting
muffin_man Replies: 8 Views: 8253	Posted: Thu Nov 08, 2018 8:57 am Subject: Echo Rockit VCF fault... troubleshooting Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
muffin_man Replies: 8 Views: 8253	Hi there, I just built the Echo Rockit, and am having some issues that I can't seem to fix myself! I have a multimeter and a scope. Input buffer, LFO and oscillator are working fine. However: ...