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Super SUPER cheap fuzzkit

Posted: Thu Feb 25, 2010 10:17 pm
by Mark
So, I'm gonna be ordering this soon

https://mmm1127.verio-web.com/grayma/catalog/138.htm

basically, when I was in my first-year electronics class, learning how to solder and all about components and PCBs and stuff like that, we had these Graymark kits to do as projects. Our teacher gave us catalogues, told us to pick 3 kits, and he would order them and we would do them and be graded on them. Well, this was one of my kits, and I was really eager to make it, so it ended up being the first PCB I ever soldered. Needless to say, I didn't know what I was doing, and it turned out horribly. It didn't work at all. Obviously I've come a long way from those good old days so I've decided to buy one, build it, see how it is. Actually, I might buy two, one to keep stock and one to modify completely. Once I get it I'll post the schematic and any modifications I do. It should be noted that there is only three controls. There's one gain/level knob, an on-off switch, and a Fuzz1/Fuzz2 switch. I emailed the company to see if I can get the schematic. Then I can take a look at it. Strangely, it seems as though there are 2 op-amps in the circuit. Could that be what the switch switches b/w? I'll of course be modifying it to have a separate Level knob, put everything on a stomp switch (with TB and an LED), maybe make the fuzz switch a stomp too...IDK, I really just need to see the schematic first :P Maybe the PCB layout would help too...

Re: Super SUPER cheap fuzzkit

Posted: Thu Feb 25, 2010 10:21 pm
by Scruffie
Well they'll send you the schematic with it i'd assume... kinda needed for building properly...

My guess, 386 fuzz with a buffer using a Dual Opamp to make it behave properly, the switch is probably just to go inbetween two values in the circuit to change the tone, But that's just speculation.

Pretty damn cheap though, but the main cost of pedals is the hardware usually... they don't skimp on the details either.

Re: Super SUPER cheap fuzzkit

Posted: Fri Feb 26, 2010 11:49 am
by Mark
Scruffie wrote:Well they'll send you the schematic with it i'd assume... kinda needed for building properly...

My guess, 386 fuzz with a buffer using a Dual Opamp to make it behave properly, the switch is probably just to go inbetween two values in the circuit to change the tone, But that's just speculation.

Pretty damn cheap though, but the main cost of pedals is the hardware usually... they don't skimp on the details either.


Of course they send you the schematic with the kit, but I wanna take a look at it before ordering it.

386 fuzz? It's not like its a Dual Opamp in a single 8-pin package, I just see two 8-pin DIPs... I'm assuming they're opamps, but I could be wrong. I don't have the schematic :whateva: ....

Yeah, its 11 bucks with all the parts, a PCB, and the hardware, but no enclosure (not a problem). I know everything is like, shit-tier quality but, hey, it's just to check out the circuit... If I really like what I come up with I can always get some good PCBs, good components, good hardware, etc...

Re: Super SUPER cheap fuzzkit

Posted: Fri Feb 26, 2010 12:07 pm
by Scruffie
A 386 is a 8 Pin DIP... the same package as a dual op-amp, it's used in lots of fuzzes & distortions and also small 1/2 watt amps so the possibility of it being one of them, is likely as I can't think of too many Fuzz designs that just use dual op amps, especially as there doesn't appear to be any diodes on that board to give any kind of clipping but, I could be wrong, it is speculation as I said, but it would be my first guess.

I just noticed something about the image though... it appears to have 2 battery clips yeah? So it's a bipolar power supplied fuzz...? or is it literally two seperate fuzzes and they didn't bother to connect the 9Vs rails.

Re: Super SUPER cheap fuzzkit

Posted: Fri Feb 26, 2010 7:37 pm
by Mark
Scruffie wrote:A 386 is a 8 Pin DIP... the same package as a dual op-amp, it's used in lots of fuzzes & distortions and also small 1/2 watt amps so the possibility of it being one of them, is likely as I can't think of too many Fuzz designs that just use dual op amps, especially as there doesn't appear to be any diodes on that board to give any kind of clipping but, I could be wrong, it is speculation as I said, but it would be my first guess.

I just noticed something about the image though... it appears to have 2 battery clips yeah? So it's a bipolar power supplied fuzz...? or is it literally two seperate fuzzes and they didn't bother to connect the 9Vs rails.


I literally have not a single clue... I wouldn't put it past them to do that...Will have more info on this soon, I promise! :P