Frantone Brooklyn Overdrive

[MobyOctopad]

Adding yet another Frantone circuit to the wishlist. The Brooklyn OD seems pretty hard to come by even by Fran's standards. A Fran original with four cascading LM386s. Crowd-sourced schematic from an old FSB post.

 

[cdwillis]

This is the first time I've seen the schematic for this one. I'm guessing Q1 is something to do with Millennium Bypass (or whatever she called her version) and that's a crowbar voltage protection at the power input?

 

[jimilee]

What in the hell is going on there? Is she using 3 opamps as buffers? Why not just use transistors, they'd take up less space and make everything much easier.

This is the first time I've seen the schematic for this one. I'm guessing Q1 is something to do with Millennium Bypass (or whatever she called her version) and that's a crowbar voltage protection at the power input?

Hell, I don't even know. It looks like a whole lot of nothing.

 

[cdwillis]

LM386 is not an op amp, it's a power amplifier. Each one is set up for 20db of gain. If you put a cap between pins 1 and 8 you can get up to 46db.

The Millenium Bypass

 

[Bricksnbeatles]

What in the hell is going on there? Is she using 3 opamps as buffers? Why not just use transistors, they'd take up less space and make everything much easier.


Hell, I don't even know. It looks like a whole lot of nothing.

Lm386 isn’t really an op amp. It’s a power amp chip and it puts out a pretty big output as well as overloading very easily for some pretty gnarly distortion. If you adjusted the circuit to work with some TL072s instead of the 386s, it wouldn’t be such a gnarly fuzz

 

[Fama]

I might be interested in this since I got a bunch of extra 386's from the one Acapulco Gold related build I did, and I don't know what else would use those that I could build.

But most of the demos I found just don't sound very good, did anyone find any good demos or examples? Or is it just a taste thing?

this one was decent, best I found so far.

 

[jwin615]

If this gets pulled off, Fran recommends, in a way, 386N-1s in frantone pedals. I'm guessing that's because they were designed for 9v operation.
And yes, crowbar on the power input. If someone tries to put 18v to N1s, poof!