Q-vibe

[DLW]

I having trouble getting a vibe effect from my etched and assembled board. I followed the build doc without any deviations. The charge pump kicks out 18V. The board passes sound when hooked to my test rig. The lamp lights up fine and when I rotate the gain trimmer back and forth it changes the brightness of the lamp. Changing the lamp brightness also dampens the sound, which is how I think the vibe effect is done.

The weird thing is for a few seconds when voltage is first applied to the circuit, the lamp "vibes". However, the lamp eventually "locks up". I have R16 and R17 socketed, as suggested in the build doc. I tried values from 1k8 to 4k7, but that doesn't seem to help at all.

Does anyone have any experience with this circuit that could shed light on the problem?

[peterc]

Do you have a link to the project? i could not find it on Etchers Paradise.

Check your component values, sounds like it could be a wrong resistor or cap. Also check for solder bridges and make sure the solder flux has been cleaned off.

Hope this helps
Peter

[somnif]

I'm assuming he's referring to the quadrovibe?: http://www.madbeanpedals.com/projects/Quadrovibe/Quadrovibe.pdf

[DLW]

Yes, it's the quadrovibe.