Thing Modulator

[{ antonio }]

I wanted to know if anyone has built the thing modulator.  I have had some trouble with.  I have let it sit for months unfinished.  its about time for me to get it done.  but as i looked at it again tonight i dont see what i have dont wrong.  

i just wanted to see if anyone has finshed it and maybe they could give me some hints.  

http://www.geocities.com/tpe123/folkurban/fuzz/thing.gif

thanks.

[brett]

Hi.  Sorry, but can't really help with the Thing Modulator.  But I can say that the Ring Frobnicator and most other modulators are less than ideal for guitar work (with the possible exception of the 1496-based designs).  With that in mind, I've been working on a simple modulator.  I've designed and tested the circuit, and have designed a PCB for the final version.  Sometime over the next few days I'll build it on the PCB to test the layout.  If all goes well, in a week or two I'll have the design on my web-page and a notice in this forum.  I'm thinking of calling it the "Modulatron".

Sorry that doesn't answer your question.

cheers

[Tim Escobedo]

What's the problem?

[mattv]

It works great for me. Double check your wiring and connections. Make sure your using the specified LMC567 chip and not the regular LM567.

[{ antonio }]

tim, could that be the proplem?

i am using an lm instead of the lmc.

i didnt know that would be a big deal.  but thanks for the help.  i will get myself a new chip today and see if that works.

thanks.

[Tim Escobedo]

Yes, the LMC567 is absolutely necessary if you want the circuit to behave. That includes a reasonable amount of carrier rejection.

The more common LM567 may not even work with the 100k resistor in series with the power pin, as it's much more of a power hog than the LMC567.

Keep in mind that this is no Blue Ringer. The internal oscillator is fairly limited in range and tone. There's no wet/dry mixing. Carrier rejection is fairly decent considering the simplicity. But any high gain effect after the device will audibly amplify the carrier to possibly annoying levels.

[{ antonio }]

thanks so much for your help.  i am on my way to get the new chip.  

thanks again.

[mattv]

...The more common LM567 may not even work with the 100k resistor in series with the power pin...

It doesn't.

[mattv]

Anyway, if you can't find a LMC567, just use the LM and remove the RC network from V+. It's noisier this way, but IMO also does weirder things.

[nightingale]

very cool~
thanks mattv!