EHX microsynth squarewave fuzz (or suggest another squarewave fuzz)

[the3secondrule]

Hmmm. I think I'm going to try and build this as per the schem I have now. If I'm only using one half of of the OTA, I might as well go with a 3080 instead? Still in production, and cheaper than a 3094. Aside from the different pinout, is a 3080 a direct sub for half a 13600?

[Scruffie]

No it lacks the output buffer darlington, you need to add that in.

[twin1965]

Yes. But it tends to be noisier.

You could do this and compare:

http://2.bp.blogspot.com/-P7jqffl_ejk/UHVUB0pXl-I/AAAAAAAAC-k/p2HwRW-52S0/s1600/LM13700+Daughterboard.png

13700 and 13600 basically the same.


Sent from my GT-I9100 using Tapatalk 2

[the3secondrule]

No it lacks the output buffer darlington, you need to add that in.

Ah ok. Would I need to do anything with the unused half of the 13600? I saw a thread reccomending connecting unused opamp to ground to stabilise them. Would I need to do something similar?

[Scruffie]

Hmm, as far as I remember, you don't need to do anything special but you can ground the current input... but you might want to do a bit of research as i'm not certain.

[the3secondrule]

just working on a layout for this one, and I had a bit of an idea...

I assume the squarewave signal will need some sort of filtering / tone control. i was thinking about having a couple of pads for send / return after the OTA. would most likely leave them jumpered, but it would mean I could send the square wave to a graphic EQ for some tone shaping. Any thoughts on whether this would be best going before or after the level pot for the squarewave signal?

[thesameage]

Love seeing the progression of this!

[the3secondrule]

i think this is good to go:

[the3secondrule]

Ordered. Once this is verified I'll have a couple of spares if anyone's interested

[GrindCustoms]

Ordered. Once this is verified I'll have a couple of spares if anyone's interested

I'm still in!

[lars]

If you successfully figured this one out, I'll be in for one too! I have a microsynth, but only use it for the squarewave and octave features. It's the Siamese Dream sound in a box .

[thesameage]

Me too!

[the3secondrule]

Sweet. Depending on interest, I might look at getting a small run of boards done (assuming the proto's work)

Rej, you'll be pleased to know my next board will be the AD9. Will start on the schem tonight...

[kothoma]

assuming the proto's work

Good luck for this!

I'm really curious how it'll sound.

[lincolnic]

Yep, also interested.