KAY UNIVOX EFFECTOR FUZZ

[SpencerPedals]

No chromed plastic on the one in the picture I attached, only chromed steel or brass.  The arched top is indeed laminated, and there's a ply reinforcement where the bridge attaches, but the solid back portion that comprises most of the guitar body is actually not laminate.  That's solid mahogany.  I have all of the hardware and neck removed (neck is getting a refret) and all wood is plainly visible. 

[Bambalam]

Sorry to resurrect this topic, but I'm trying to create a fuzz pedal of the one in the Effector circuit. I have drawn a schematic, but I'm not sure that it is correct. I'm hoping that someone here may be able to confirm or correct my drawing.

Thanks!

[antonis]

I have drawn a schematic, but I'm not sure that it is correct.

For unity gain make R4=R3 (at the expence of max gain..)
R100 might be ommited (although it makes no harm..)

[amptramp]

There is no connection for the second half of the TL072 and without applying fixed bias within the active input range, the second section can oscillate.  In this circuit, you could use a TL071 but if you want to use a TL072, connect the unused op amp with the non-inverting input to the non-inverting input of the active section and connect its output to the inverting input.

[Bambalam]

Thanks for the responses! Much appreciated. Having difficulty locating a confirmed schematic, there's comments about the MS Paint drawing earlier in the thread being most accurate. I have made a sudo schematic of it to improve on. I'm trying to create an accurate full schematic as well as how to break out each effect into its own pedal. The phase and fuzz seem most interesting. I'd probably put them together in one.

C18 seems like a weird value .47uF. I'm wondering if that's an error and it's a nonpolarized 47nF?

[ElectricDruid]

C18 seems like a weird value .47uF. I'm wondering if that's an error and it's a nonpolarized 47nF?

.47uF would be 470n not 47n. But yes, you'd expect such a value to be nonpolarised.

For the op-amp, given the vintage of the thing, I'd want to stick an old 741 in it.

[Bambalam]

This is what I can make out of the MS Paint and other schematic snippets.

[antonis]

Sorry but I'm confused a bit..

Are we trying to verify your schematic diagram correctness according to which source..??

[Bambalam]

Sorry but I'm confused a bit..

Are we trying to verify your schematic diagram correctness according to which source..??

Sorry for the confusion. I jumped ahead of myself and now I'm trying to take a better approach.

I haven't found a confirmed schematic for the Effector circuit to work from for the Fuzz pedal I'd like to make based on this. There was a "MS Paint" drawing that comments on the web lead me to understand that it was an accurate trace of the PCB. I decided that I should draw a schematic from that first. I have added the MS Paint drawing to my post.