Queen Triggered wah IC's

[Sauerkret]

annyone know what IC's are used?

[Mark Hammer]

You can populate the whole thing with 4558s most likely.  The trickier part is the JFETs, which I think are 2N4302.

[Sauerkret]

i found this info.

Thank you Mark. The Queen has three 4558's, one LM324 and a bunch of 1N925's. It has an AC jack with two wires - one goes to a 1N925 and the other to the base, (i think), of a 2N5088. There are three (of the same) semiconductors that i have no clue about. They only have 'SCOTT' written on them.

can annyone confirm??

Thx, eric

[Mark Hammer]

The 1N925s can easily be replaced by 1N914/1N4148, with the possible exception of the one at the AC adaptor jack, which could probably stand to be a 1N4001 or similar.

Op-amps A, B, and C are 4558, and op-amp D is the 324.  "Scott" is Mike Matthew's son ( http://www.ehx.com/member/5/ ), so those FETs might simply be labelled by who sorted/selected them - kinda like "inspected by #12".  If you look at other pedals of the same era, however, the most commonly used JFET was the 2N4302.