PWM - JRC386 vs LM386N-1?

[smnm]

Hi

[EDIT - sorry, got lazy and didn't check archives first - question changed]

I've bult a PWM using an LM386N-1 rather than the JRC386 op amp used in Tim's schematic at http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html

At the moment the effect is very very quiet,  sputtering into loud heavily gated crackly fuzz only when the heavy strings are hit hard - I'm wondering if the problem is that the the LM386N-1 is too puny, or was damaged by the the battery voltage.

I tried it with another fuzz feeding the input and it was ok, so it seems to be a prob with the op amp.



Simon

[Gripp]

As you said, the another fuzz test seems to indicate a problem with the LM386N or an early wiring error. Did you run the fuzz in front of the entire thing, LM386N and all?
The word is that the LM386N can be temperamental and that the JRC386 is much more well behaved. Haven't tried myself. My PWM is on a breadboard and I've only tried it with the JRC386 (from Banzai actually), but that works just fine.
I've tried running Tim's Simple Square Wave Shaper Made Simpler (set for square) directly into the CD40106 and that works fine as well.
Best!
Pelle G

[smnm]

As you said, the another fuzz test seems to indicate a problem with the LM386N or an early wiring error. Did you run the fuzz in front of the entire thing, LM386N and all?

I just plugged another fuzz into the input as a boost, through the LM386N. It still sounded gated, but I liked it.

I just started using lead free solder and seem to be getting a lot more bad joints with it as it flows less easily, so I'll check the IC pins again, and go back to some old-fashioned solder. I'm working on plain perfboard, which I'm finding tricky.

S

[smnm]

Yay-uh!
I'm ressurecting this dull thread to say I FIXED MY PWM! and I think it's immediately my favourite noise fuzz - I love the Uglyface and think the Parallel Universe is pretty cool, but with only two knobs, the PWM is much easier to use and still makes mental squelchy synthy fuzz noise. Tim Escobedo - we salute you!
The clip on the Circuit Snippets site makes it sound quite subtle compared to the crazy noise it's capable of! Another monster pedal. If I had a pedalboard it's be straight in there.

[Gripp]

We certainly salute Tim Escobedo, the master of musical-unexpected-minimalistic -functional electronics design!!
And congrats to you too! Try sweeping the pwm with something, hand, foot, lfo, sequencer what have you. You're in for a treat 
Now on to breadboarding the Uglyface