Search found 388 matches

by plush
Yesterday, 14:49
Forum: Pedal Debugging & Troubleshooting Support
Topic: 9v battery goes to 4.5v when plugged into a stompbox
Replies: 2
Views: 55

Re: 9v battery goes to 4.5v when plugged into a stompbox

I'm an amp guy and I don't usually work on pedals, but my guess is - this should be some standard behavior for a typical fault in guitar pedal. Sadly I don't know what may causes the problem. The process stays the same for both amps and pedals: you see voltage drop on your power supply - you look f...
by plush
13 Jan 2021, 12:22
Forum: Software Room
Topic: 3PDT KiCAD footprint.. OVAL HOLES!!!
Replies: 2
Views: 130

Re: 3PDT KiCAD footprint.. OVAL HOLES!!!

pilotedge wrote: 13 Jan 2021, 10:47 or any ideas?!
You can create your own footprints in Kicad or edit existing ones.

Check build-in footprint editor
by plush
02 Jan 2021, 20:31
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) Clusterfuzz [traced]
Replies: 38
Views: 14768

Re: Function f(x) Clusterfuzz [traced]

Either they adjusted the volume in editing, or they have some kind of automatic level control going on. There is a MASSIVE volume difference between the schottky diodes and LED/FET or no clippers. Should anyone have troubles with volume levels in this one, it's quite easy to fix this by adding resi...
by plush
02 Jan 2021, 09:00
Forum: Pedal Debugging & Troubleshooting Support
Topic: Big Muff Low Output
Replies: 1
Views: 289

Re: Big Muff Low Output

Something is not right, those collector voltages are way too high. The bias is probably messed up. Post detailed build pics.
by plush
19 Dec 2020, 22:17
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Does anyone know what pedal this is?
Replies: 8
Views: 633

Re: Does anyone know what pedal this is?

Edwards Light Beam volume pedal

Image
by plush
18 Dec 2020, 09:30
Forum: Pedal Debugging & Troubleshooting Support
Topic: BOSS DS-1 led not lighting up
Replies: 11
Views: 395

Re: BOSS DS-1 led not lighting up

It seems that the transistors are doing their job (switching). Also the voltage is changing at the LED, although I think 200mV is a bit too low. Q4's collector gets a bit of +9V from R30 too. Did you measure the voltages along the whole circuit, the +9V D2 pin, the junction of D2 and R35, the junct...
by plush
17 Dec 2020, 16:07
Forum: Pedal Debugging & Troubleshooting Support
Topic: BOSS DS-1 led not lighting up
Replies: 11
Views: 395

Re: BOSS DS-1 led not lighting up

I have an old DS-1 that I've had for years, everything works fine including switching the effect on and off. The problem is the LED does not turn on even though the LED itself is fine (i pulled it out of the circuit). I've replaced the zener diode (D2) and resistor (r35) but still doesn't work. If ...
by plush
16 Dec 2020, 23:06
Forum: Pedal Debugging & Troubleshooting Support
Topic: better bias pot than alpha?
Replies: 19
Views: 544

Re: better bias pot than alpha?

cspar wrote: 16 Dec 2020, 19:14 I moved the 37k output resistor to the other side of the output cap. It's really a hot 36k...

What are you trying to achieve with such a large output resistor value? What is it here for in your case?
by plush
16 Dec 2020, 15:54
Forum: Pedal Debugging & Troubleshooting Support
Topic: better bias pot than alpha?
Replies: 19
Views: 544

Re: better bias pot than alpha?

Well I suppose I should start a new thread about the schematic but since mouths are watering I might as well post a prerelease of the concept. I've been working on cascading between decades and complementing values to get a single transistor to do a little of everything. This is the Tone Trickler v...
by plush
16 Dec 2020, 09:24
Forum: Pedal Debugging & Troubleshooting Support
Topic: better bias pot than alpha?
Replies: 19
Views: 544

Re: better bias pot than alpha?

A schematic would help to answer your question. But here's an approach to fixing it on the pedal Intripped referred to: Should also note that this approach will alter the tonal characteristics due to mosfet's input capacitance. With input pot being set to 50%, you'll get up to 3khz cutoff, dependin...
by plush
15 Dec 2020, 15:36
Forum: Pedal Debugging & Troubleshooting Support
Topic: better bias pot than alpha?
Replies: 19
Views: 544

Re: better bias pot than alpha?

Sorry, but you can't achieve non-scratchiness with mechanical bias pot.
by plush
13 Dec 2020, 02:37
Forum: Boutique Stompboxes dissected...
Topic: Hudson Sidecar
Replies: 7
Views: 570

Re: Hudson Sidecar

Ratimus wrote: 13 Dec 2020, 00:35 Ge diode is Russian NOS, but the one I looked at appeared to have a transistor part number.
I guess, because it is not a dode, but a transistor, used as a diode :)
I also doubt it's russian-made. We've never manufactured this type of housing, afaik.
by plush
07 Dec 2020, 15:40
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) Clusterfuzz [traced]
Replies: 38
Views: 14768

Re: Function f(x) Clusterfuzz [traced]

FeVeR2112 wrote: 07 Dec 2020, 04:29 Here is a variation with the selector switch connections on the bottom which can be perhaps easier to read the labeling
.

10R put from V+ to ground is a no-no, dude.
Otherwise you need to rename your brand to "funny smoke effects".
by plush
29 Nov 2020, 14:59
Forum: Circuit Blocks
Topic: arduino tap tempo for pt2399 ?
Replies: 2
Views: 573

Re: arduino tap tempo for pt2399 ?

Why use DAC and LDR, when you can use digital potentiometer? :)
by plush
26 Nov 2020, 07:58
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss OS-2 Self Oscillating
Replies: 15
Views: 509

Re: Boss OS-2 Self Oscillating

Scope looks like: https://i.postimg.cc/wTxrm7dH/DS1-Z-Quick-Print6.png With effect on https://i.postimg.cc/xj378Lht/DS1-Z-Quick-Print7.png With effect off Hey, can you also probe the gate of jfet, just for reference, please? Adding the extra capacitor after the 10k input resistor as suggested made ...
by plush
25 Nov 2020, 16:20
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss OS-2 Self Oscillating
Replies: 15
Views: 509

Re: Boss OS-2 Self Oscillating

Yes, I have a scope, how should I go about testing? I'd start with turning AC coupling on your scope, setting probe to x10 and probing on those points (w/ your cord plugged and fx in active and bypass mode) Also, do check your cord for possible shorts. In some cords, there is additional black carbo...
by plush
25 Nov 2020, 15:40
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss OS-2 Self Oscillating
Replies: 15
Views: 509

Re: Boss OS-2 Self Oscillating

Hey, it is not supposed to oscillate under described conditions.

IMO you should check input buffer stage. It may be faulty.
Do you have a scope?

Also, placing small 100-200pf cap to ground after 10k input resistor might also solve the issue.
by plush
24 Nov 2020, 11:34
Forum: Pedal Debugging & Troubleshooting Support
Topic: Fuzz War Mk 1
Replies: 4
Views: 282

Re: Fuzz War Mk 1

The volume pot wiring is incorrect
It should be wired like this

I dunno if this is designer's flaw, or someone, who was tracing it, was smoking crack.

Also, the tonestack values is a mess...
by plush
24 Nov 2020, 07:57
Forum: Pedal Debugging & Troubleshooting Support
Topic: Does Ground reference always need to be 0 Volts?
Replies: 4
Views: 281

Re: Does Ground reference always need to be 0 Volts?

If you are planning to daisychain your pedal with others through the same non-isolated power supply and one of them has a different refference rail, then you'll have a trouble. If your PSU has isolated outputs and you are not planning to share them, then you can build your pedal referenced to almost...
by plush
23 Nov 2020, 15:43
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Topic: How to Convert single supply voltage circuit to Dual +/- voltage supply???
Replies: 10
Views: 633

Re: Topic: How to Convert single supply voltage circuit to Dual +/- voltage supply???

twotees wrote: 23 Nov 2020, 08:41 I am thinking easiest solution would likely be just hook the +18volt to the pcb + and the -9volt to the pcb (- ground) and let the resistor divider circuit do the Vref , (vdd/2 voltage)
You don't want to do this. Trust me.