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Artec - Twinhead rev 1.22  [traced]

Posted: 28 Dec 2014, 15:41
by deafbutpicky
Hi,
I'm not shure if this is the right place for this pedal, as it is not boutique, but it was gooped so anyways...
I had this laying around for some time now and thought I'd better post it as is before it gets lost in my pile of layziness :)
So, sorry for the scibbling but it should be good enough for a curious look.
I find this interesting as there are no clipping diodes on the board, even though it's an opamp circuit.

-The opamps are U1: JRC074, U2:TLC2264C
-Caps are not labled
-the strange gainpot is a fourpin, the fourth tapped off at the middle between cw and ccw, numbers around it show the resistance
measured at the extreme settings. I don't know if it makes much sense but was the best I could get :whappen:
-skipped the led circuit (including some low voltage indication) and the bypass switching (millenium).

Image

Re: artec twinhead rev 1.22

Posted: 28 Dec 2014, 21:01
by The G
It's a Sansamp GT-2 with the AMP switch replaced with the 200k blend pot between "Tweed" and "British" settings and the MOD and MIC switches replaced by fixed components.
BTW, R24 should be 100k and C17 is probably 2n2.

Re: artec twinhead rev 1.22

Posted: 28 Dec 2014, 21:46
by deafbutpicky
Thanks for the info.

I checked the label and measured R24 and R23 again. They're just as drawn.
Strange but true. C17 reads 9.7n measured in circuit.