Installing a fuzz in a jazzmaster

^ I think it is too. My guitar had a pop when I turned on the switch when it was wired like this. You could try wiring it with the switch on the ground side, and such that the input of the PCB is grounded when it's off. I'm wondering if you would also need coupling caps as well
 
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Try this IMG_5948.jpg

the idea being that grounding the input when the effect is off will allow the caps to discharge into ground. But I'm not sure how the PCB will like having its ground lifted. A 4pdt switch would allow for power application as well as grounding when off. But try it this way and see how it works
 
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falco_femoralis said:
Try this View attachment 98157

the idea being that grounding the input when the effect is off will allow the caps to discharge into ground. But I'm not sure how the PCB will like having its ground lifted. A 4pdt switch would allow for power application as well as grounding when off. But try it this way and see how it works
Click to expand...
I followed this diagram and it's working with minimal pop! Thanks so much!
 
ragamuffin said:
So I have a 1n cap, where exactly would I be putting it? From the signal input on the effect board to ground?
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What is likely happening is the electrolytic caps in C3 and possibly C1 are leaking DC voltage to ground and causing the pop. Elec caps leak more than others. This means they let DC thru when they shouldn't. If you want to experiment a little, find a 2.5uf film, MLCC, or tantalum cap and install that instead of C3. If you use a tant, just make sure to get the polarity right.
 
ragamuffin said:
So I have a 1n cap, where exactly would I be putting it? From the signal input on the effect board to ground?
Click to expand...
Yes, first component in the circuit and going to ground. It just takes some high end off, including radio and hiss, if you have them. It won't solve your popping issue, however.
 
So last night after I put the pickguard back on I realized that I had not removed the direct ground wire to the circuit, so the circuit was getting power all the time and that's why there was so little pop. This morning I opened her up and removed that ground wire (so relying on the switched ground wire) and there was a little more pop but still acceptable in my book.

I also installed the 1nf input cap and a 100pf miller cap on Q1 (that I saw recommended for reducing noise in Electrosmash's Fuzz Face article) and things there is significantly less hiss!



One last thing before I shove it all back in the guitar: My trim pot will not reach -4.5v on the Q2 bias. The lowest it will go to is around -5.2v. I'm sure -5.2v is probably close enough, but I 'd kind of like to be able to set it a little lower. What would I change to solve this? Would the R3 value be relevant to this?

I bought the transistor pair from Amplified parts and they came with some resistor in values that they suggested (slightly different than the schematic) and my R3 is currently a 560ohm, as opposed to the stock 470ohm.
 
falco_femoralis said:
What is likely happening is the electrolytic caps in C3 and possibly C1 are leaking DC voltage to ground and causing the pop. Elec caps leak more than others. This means they let DC thru when they shouldn't. If you want to experiment a little, find a 2.5uf film, MLCC, or tantalum cap and install that instead of C3. If you use a tant, just make sure to get the polarity right.
Click to expand...
Unfortunately I don't have any close non-electrolytic caps to play with, I could orders some though
 
I don't know where you put a trim pot. It's not part of the circuit. And there is only Q1.

I buily mine stock.

Anyway Increase the resistance between VCC and the collector to lower the voltage.
 
andare said:
I don't know where you put a trim pot. It's not part of the circuit. And there is only Q1.

I buily mine stock.

Anyway Increase the resistance between VCC and the collector to lower the voltage.
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This is the layout that I used from Amplified Parts. The trim pot is in place of the 8.2k resistor that connects with the Q2 collector.

Yeah I guess I'll not worry about it (y)

one_knob_ff_Figure1.webp
 
I got the pickguard on and all strung up and the fuzz sounds really great! Thanks guys for all the help! 🤘

The hiss is still pretty loud, so next time that I order components I will get some non-electrolytic caps to try and replace C1 and C3

But overall I'm stoked!
 
sticky1138 said:
Don't mean to derail, but what bridge do you have on there (and how is it)? I'm a huge offset fan but haven't seen that one before
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Hey there it's a Tuffset bridge; it's an expensive part, but really well made/designed. It retains the rocking function of the original offset bridges, has adjustable individual string height, everything locks down tight so there's no rattling etc, sounds good, and most importantly it stays in tune well! I really like it! I choked a little on the price tag when I bought it, but that's the honestly the only thing about it that I can knock.
 
ragamuffin said:
Hey there it's a Tuffset bridge; it's an expensive part, but really well made/designed. It retains the rocking function of the original offset bridges, has adjustable individual string height, everything locks down tight so there's no rattling etc, sounds good, and most importantly it stays in tune well! I really like it! I choked a little on the price tag when I bought it, but that's the honestly the only thing about it that I can knock.
Click to expand...
Is this a J Mascis JM that you stripped? The vibrato plate looks to be closer to the bridge than normal.
 
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