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BetterOffShred wrote:Are you saying when it was all three circuits separate it wasn't noisy, but with the 2 combined in the wah it is?
Interesting
It's just running off a battery. The red + goes to the wah board and then I took the boost v+ from that. The battery black- goes to the stereo input jack and connects to the chassis ground point. The boost ground goes to the top left lug of the dpdt switch, which then goes to ground.crochambeau wrote:How are your formerly separate grounds and power rails connected to one another in the single enclosure?
crochambeau wrote:Regarding ground reference, are there additional links based around signal path, or did you simplify where you could?
crochambeau wrote:I'm ASSuming the unwelcome noise is constant like a ground loop and does not change frequency as you actuate the wha.
MechaGodzilla wrote:It's just running off a battery. The red + goes to the wah board and then I took the boost v+ from that. The battery black- goes to the stereo input jack and connects to the chassis ground point. The boost ground goes to the top left lug of the dpdt switch, which then goes to ground.
Should I just connect it to the chassis ground? Is there a problem with powering it this way?
MechaGodzilla wrote:I don't know how but could it be a problem with polarity? I'm pretty sure the fuzz is PNP and the wah is NPN, which isn't an issue for the boost mosfet bs170 but perhaps they don't want to be friends for some reason?
Alright, I got it finally figured out... an SHO-style MOSFET boost with NO CRACKLE!!!
I came up with a new gain control for it that allows for the same range of gain adjustment without having to adjust the Source. Since the Source stays fixed, there is no crackling.
While thinking about how to solve this problem, I realized I could treat the basic gain stage as an inverting opamp. So, I set a fixed max gain and tried a variable resistance in series with the input and voila, works perfectly.
Check it out and give it a try; it's a great improvement over the SHO and it's easy to tweak the sound to taste.
MechaGodzilla wrote:Yeah it's like 7 ohms measuring across the sleeves
crochambeau wrote:I'd also hard wire the sleeve of the input jack to the sleeve of the output jack (and I'll use either jack as the sort of "master" ground plane, since battery powered stuff typically isn't really current hungry).
eatyourguitar wrote:crochambeau wrote:I'd also hard wire the sleeve of the input jack to the sleeve of the output jack (and I'll use either jack as the sort of "master" ground plane, since battery powered stuff typically isn't really current hungry).
this is the only part I would disagree with you.
eatyourguitar wrote:and don't forget to put a 100R, 10nF, 10uF in the power input of the PCB. standard RC lowpass power input filtering.
crochambeau wrote:I'm curious, are you disagreeing with tying the output jack sleeve to the input jack sleeve or just the part about treating the ground connected output jack as a suitable ground reference tie in point?
BetterOffShred wrote:I always use a huminator on multiple circuit stuff.
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