[SOLVED] Caesar Chorus High pitch Noise problem!

D

d.d.sound

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Hi! I'm new to this forum! I have a problem with the Caesar Chorus I built. When I turn up the Lag potentiometer, a high pitched noise appears. Synchronized with the Rate pot.
What could be the problem? Can someone help me? I used the "mn" integrated instead of the Cool Audio "v". I don't know if this could affect it. Thanks in advance!
D.

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d.d.sound said:
Hi! I'm new to this forum! I have a problem with the Caesar Chorus I built. When I turn up the Lag potentiometer, a high pitched noise appears. Synchronized with the Rate pot.
What could be the problem? Can someone help me? I used the "mn" integrated instead of the Cool Audio "v". I don't know if this could affect it. Thanks in advance!
D.

View attachment 24190View attachment 24191
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Did you use a Plastic Dust Cover on your Blend pot???
 
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First see if you can insulate the pot from the board with a piece of non-conductive material. (Tayda supplies pot dust covers for future reference). See if that eliminates the clock noise (surmising here). Have you tried tweaking the trimpot a bit? There may be an optimal setting where you get the chorus effect but minimal noise. Perhaps try the tweak with the lag pot producing the noise and see adjusting if the trimmer affects this. This board is next on my never ending list of PPCB orders. Will be keen to know how you get on.
 
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Have a look at the generic troubleshooting guide maybe. Next step would be to provide pics of both sides of the board. There may be an incorrect component value somewhere. Then measure voltages with a DMM and provide these if possible.
 
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fig said:
Well it certainly looks nice. There are folks with way more experience than me, so I'll not get in the way. Hope you get it sorted quickly! :)
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Yes indeed, @fig. My suggestions are based on what I’ve been reading up on regarding BBDs and the so-called ‘clock whine’ issues associated with them. I’m waiting for my five pairs of 3102/3207s to reach here and will order the Caesar boards once I’ve checked them (the chips) to see if they are ok. So I’ll gladly defer to folks who have actually built the board successfully :cool:
 
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d.d.sound said:
Good news!!! Checking the components for the third or fourth time I realized that I have put c11 of the wrong value!
470pF instead of 47 pF!
Thanks to everyone for the advice! Good advice is always needed!
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Good news! That's why I quintuple check every value before soldering.
 
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So, this is great timing for a 15% off PPCB opportunity too good to miss. I ordered one each Caesar and Cepheid PCBs. Just waiting for the BBD chips to arrive, which could take awhile but hell, Patience is my middle name after all. Thanks for all the feedback on the Caesar (pun intended).
 
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