Annimator and Ring Mod Question

[jmcecil]

I'm working on several of the Yusynth projects. Wow, thanks a ton. I can't believe how awesome and informative these things are to those of us just starting. THANK YOU!

1) On the Saw animator there are 12 100k resistors listed on the BOM. On the PCB I received from bride chamber the one nearest the edge of the PCB (R13?)is shown as a 10k on the PCB. Unfortunately, I can't read the circuit well enough yet to know which R# it really is. It's the one just to the right of CV1 and at the edge of the PCB. Anyhow, is that a typo on the PCB, or did that get turned into a 10K?

2)On the Dual Ring Modulator, I couldn't find 220 Ohm trimmers. Is something larger like a 250 or 500 ok?

Thanks for any help you can provide
Jeff

[capicoso]

For the saw animator, http://yusynth.net/Modular/Commun/SAWANIM/sawanim-COMP-LAY2.jpg
i suppose it's 100k. On the schematic R13 is 100k, usually the typos are in the pcb layout, always refer to the schematic since it's the original... the others are adaptations from the schematic, and errors can happen

for the ring modulator 250 is fine

[yusynth]

As capicoso says

[jmcecil]

thank you!

[jmcecil]

hmm ... closest trimmer I can find is 500 ohm. Is that to far out of range?

[yusynth]

yes it's too high

[jmcecil]

figured you'd say that

No one seems to carry them in the US. The only ones in the 200->400 ohm range are the tripod kind. I have a bourns part number, but they don't seem to be carried by anyone.

Anyone know where you can get a 220 ohm trimmer in the US?

[jmcecil]

sorry to resurrect this topic, but I still can't find a 220 ohm trimmer anywhere. I've even tried contacting Bourns directly ... I can buy a lot of 1000 from them

Anyone have a clue where to source a couple 220 ohm trimmers? I've tried 200 ohm, but can't get it to go anywhere near silent during the trimming process. Any help would be appreciated.

[yusynth]

You may try using a 500 trimmer and use a 270 ohm resistor connected between the extreme legs of the trimmer, this way the circuit sees the good resistor value.

Otherwise I checked on the Mouser's site and there are some product references :
652-3296W-1-221ALF
652-3296W-1-221LF
652-3296Y-1-251LF
652-3296X-1-221LF

[jmcecil]

[gregcomposition]

Hi!
Maybe I'm wrong, but I think the popular 200 ohm trimmers could replace the 220 ohm? I used them in my Ring Modulator and they do the trick.
Ups, you wrote that you have tried it and it doesn't work. Sorry, I missed your previous post.

If not - I've done a little research - here you have a 250 ohm trimmer with a 1 piece minimum order quantity:
http://www.newark.com/bourns/3299w-1-251lf/trimmer-pot-250-ohm-10-25turn/dp/06X8985

Best regards,
Greg

[jmcecil]

[gdavis]

[gregcomposition]

Yes, I made this module a couple months ago as the one of first modules made by myself. I reduced it to the only one ring mod (AxB), then connected all parts on a common universal PCB using just the schematic diagram. As you can see, there is a 200R trimmer among its. I don't remember yet if I've got some problems with trimming it but it's working as is.
All my best,
Greg

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[jmcecil]

I appreciate the information. I should mention that I am getting Ring action. I just have a lot of bleed. So that's why I thought it was a trimmer problem. But, I'll go back through and see if I have something else screwed up.