lm339.... in a fuzz?

[Aph]

Would using diodes in parallel with the 100k (nfb)make it musically fuzzy? If that's a thing?

Gives a slightly different character, of course. Makes the highest notes of the guitar "sing" just a touch better.
The sample I posted is without the diodes.

[PRR]

> the chip output can swing most of 0 - 9v (*)..... * it isn't an active swing to +9v.

470nFd against 15K means full swing to 22Hz, 1/10th swing at 220Hz, 1/100th swing (40mV!) at 2KHz.

And asymmetrical, so with output biased at 4.5V any huge signal will slam the average output bias to 0.1V and trash the other half of the wave.

[Kipper4]

Nice work.
Sounds very synthy.
I like it.

[anotherjim]

LM339 sounds like a fine crunch fuzz but probably not a sustaining-singing effect?
Can't get my head around the bargraph one - is it just one LED output heard from an otherwise standard meter circuit?

Here's a chip I plan to play with....

TL594 (also TL494) block diagram.
Osc has a sawtooth on the timing cap.
Flip-flop is hard wired as divide by 2

[Aph]

Not only that  when it clips the output is going to be a saw-tooth as the o/p transistor will short out the cap quite easily in the negative direction but the cap can only charge slowly in the positive direction.

And asymmetrical, so with output biased at 4.5V any huge signal will slam the average output bias to 0.1V and trash the other half of the wave.

Looking at a scope, it is indeed a sawtooth with a flattened bottom. Adding diodes, of course, makes it more square. With diodes, on the higher notes, it's stays like a sawtooth until the note "blooms" and you can see the waveform slighly flatten the saw peaks... compressing ever so slightly. I guess this explains the "singing" I was refering to.

[Rob Strand]

Can't get my head around the bargraph one - is it just one LED output heard from an otherwise standard meter circuit?

I don't think it can be done.  Before the dedicated chips the LM339 was often used for bargraph circuits.   However you can't use bar graphs chips for opamps as the opamps are hardwired (well unless the chip actually has a free opamp inside.)

[Aph]

Nice work.
Sounds very synthy.
I like it.

Yeah!

[PRR]

> I don't think it can be done. .... you can't use bar graphs chips for opamps

No; but I thot the idea was a FUZZ. If the bottom LED lights your cone moves forward, else back. A comparator with a small offset.

Dreading Aph's threatened demo.

[EBK]

Ok, so how about a LM3914 pseudo-bitcrusher while we at at it?   

[Rob Strand]

No; but I thot the idea was a FUZZ. If the bottom LED lights your cone moves forward, else back. A comparator with a small offset.
Dreading Aph's threatened demo.

Ah, that's going to be angry.

Maybe a crude digitizer.

[Aph]

Here ya go... the sweetest sounds this side of metal Motown. With some incredibly delicious virtuosic playing by yours truly.

https://soundcloud.com/nicenportly/lm3914-fuzz-demo

[Aph]

Can't get my head around the bargraph one - is it just one LED output heard from an otherwise standard meter circuit?

Here's a chip I plan to play with....

>>>>TL594 (also TL494) block diagram.<<<<

Osc has a sawtooth on the timing cap.
Flip-flop is hard wired as divide by 2

The internal drawing of the LM3914 just shows basically a buffer hooked up to several comparators which I figured just pulsed the LED's. Pulse = sound (in this case).

I actually picked up a TL594, too. Let us know what you come up with! 

[Rob Strand]

Here ya go... the sweetest sounds this side of metal Motown. With some incredibly delicious virtuosic playing by yours truly

Gates a bit on the small signals but it sounds a lot better than I expected! 
I could smooth it out a bit with my sound card EQ.


I wonder if adding a dither signal (with noise) helps at all.

[Aph]

I wonder if adding a dither signal (with noise) helps at all.

Yeah, I never thought of that. Maybe I'll keep playing with it a little.

[pinkjimiphoton]

Here's a demo of the LM339 fuzz circuit:

https://soundcloud.com/nicenportly/lm339-fuzz-demo

Complete with unintelligible guitar playing by yours truly.
I may also upload a sample of the LM3914 fuzz... yeah, that's a threat.

dude, your playing is fine. and that fuzz has a pretty cool tone!!!! i can dig it. has a really cool kinda almost muted fuzz kinda tone. the reverb helps for sure.

intrigued!! hopefully can spend some breadboard time when stuff slows down... thanks brother!

[Aph]

Thanks, jimi.
Try the diodes across the output pot as per Kipper4's suggestion. It's very subtle, but I think I prefer it.