Search found 1928 matches

by mictester
27 Jun 2020, 16:47
Forum: DIY Stompbox designs
Topic: What are the purpose of multiple transistors ?????
Replies: 4
Views: 281

Re: What are the purpose of multiple transistors ?????

Hello Guys :D !! I am really excited that I found this awesome forum and helpful community, as I am starting to build my first pedal, which is a distortion pedal. I read the (Design Your OwnDistortion By Rikupetteri Salminen) and I understood every bit in it, when when I started to look into other ...
by mictester
11 Jun 2020, 17:48
Forum: Ready-To-Build Effect Projects
Topic: Really Cheap Compressor [verified]
Replies: 411
Views: 27039

Re: Really Cheap Compressor [verified]

Where did you find the perfect LDR? Do you have a part number for it? I used to use the RPY58A, which worked perfectly (without Jimi's "fuzzy goodness"!).
by mictester
23 Apr 2020, 12:23
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 162
Views: 55677

Re: Solo Dallas - SVDS Replica [traced]

The mod that I made to a few wireless guitar rigs (for some very well-known guitarists) was to disable the expander on the receiver - they preferred the compressed output from the receiver. That's all that was done to Angus Young's gear. I frequently modified the expander in the receiver to be a no...
by mictester
20 Apr 2020, 10:32
Forum: Parts Sourcing & Trading
Topic: Resistor type in Eric Johnson Fuzz Face?
Replies: 6
Views: 1038

Re: Resistor type in Eric Johnson Fuzz Face?

You could do what a friend of mine did recently: He built a tiny Fuzz Face board using small plastic silicon transistors with small value capacitors base to collector of each transistor, and wired this to the front panel pots, the jack sockets and the footswitch. The battery connector went to the "d...
by mictester
20 Apr 2020, 10:14
Forum: Pedal Debugging & Troubleshooting Support
Topic: Weird behavior Dunlop JH-2S Classic Fuzz Face
Replies: 6
Views: 340

Re: Weird behavior Dunlop JH-2S Classic Fuzz Face

Check the voltages around the op-amp package: Pins 1, 2, & 3 should be 4V5, and so should 5, 6 & 7. Pin 8 should be close to 9V and pin 4 should be at 0V.

Check the continuity of TP4
by mictester
20 Apr 2020, 00:09
Forum: Parts Sourcing & Trading
Topic: MN3007 GENUINE
Replies: 2
Views: 370

Re: MN3007 GENUINE

Wow! £10 each! I have several tubes of 50 per tube.... I'm RICH!!!
by mictester
19 Apr 2020, 01:13
Forum: Boutique Stompboxes dissected...
Topic: Fulltone - OCD [traced]
Replies: 570
Views: 181843

Re: Fulltone - OCD [traced]

D4 is a schottky diode, 3v3, 5v6 or so. Nope. You mean ZENER diode. A Schottky diode is a completely different beast - low forward voltage drop and low reverse leakage. A zener diode is designed to be used reverse biased, and when the marked threshold voltage is reached, it starts to conduct.
by mictester
16 Apr 2020, 02:23
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 162
Views: 55677

Re: Solo Dallas - SVDS Replica [traced]

FFS!!! You've all missed the obvious. I put a circuit up here several years ago, using the halves of an NE/SA 570/571 as a compressor first (actually as an ALC circuit - see the datasheet) and as a noise gate second. Set up correctly, this gives plenty of clean sustain, but shuts off the objectiona...
by mictester
14 Apr 2020, 12:22
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 162
Views: 55677

Re: Solo Dallas - SVDS Replica [traced]

FFS!!! You've all missed the obvious. I put a circuit up here several years ago, using the halves of an NE/SA 570/571 as a compressor first (actually as an ALC circuit - see the datasheet) and as a noise gate second. Set up correctly, this gives plenty of clean sustain, but shuts off the objectionab...
by mictester
12 Mar 2020, 04:08
Forum: Boutique Stompboxes dissected...
Topic: Keeley - Fuzz Bender [traced]
Replies: 39
Views: 5198

Re: Keeley - Fuzz Bender [traced]

Here is an updated schematic with cap values. Caps C11, C12, and C17 have * to indicate that they are best-guess values based on their locations in the circuit, as the Tone Bender and Metal Zone do not have analogous capacitors. C11 is a bright cap on the Fuzz control, C12 is an additional power su...
by mictester
09 Mar 2020, 21:28
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread CB30 [traced]
Replies: 84
Views: 25070

Re: Catalinbread CB30 [traced]

Nobody noticed the missing capacitor in the input to the second µ-amp - it needs to be between the 100k resistor and the gate of the lower FET in the second µ-amp. Put 100n in there (like the input to the first stage, and the thing springs to life, since turning the "Gain" control no longer screws u...
by mictester
02 Mar 2020, 03:07
Forum: Boutique Stompboxes dissected...
Topic: Keeley - Fuzz Bender [traced]
Replies: 39
Views: 5198

Re: Keeley - Fuzz Bender [traced]

C7 is unlikely to be in series with R27 - the first op-amp bias wouldn't happen with the capacitor in the way.
by mictester
27 Feb 2020, 18:17
Forum: DIY Stompbox designs
Topic: Anyone successfully tried the Coda Effects relay switching?
Replies: 25
Views: 8152

Re: Anyone successfully tried the Coda Effects relay switchi

Hello please could you explain why you've removed the freewheel diode on the relay? Usually this diode is mandatory to protect the relay against feedback voltage. Thanks. Because the pins for the coil "swap voltages" when the relay is activated, and "swap back" when it's deactivated. It's NOT a nor...
by mictester
30 Jan 2020, 13:08
Forum: Ready-To-Build Effect Projects
Topic: Really Cheap Compressor [verified]
Replies: 411
Views: 27039

Re: Really Cheap Compressor [verified]

I just dropped the LCR0202 straight in and it worked right away. I've even etched a PCB to accommodate this part (it's just a minor tweak of my old PCB). Sounds fine!
by mictester
30 Jan 2020, 12:43
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Colorsound - Supasustainer compressor
Replies: 4
Views: 4

Re: Roland - AS-1 Sustainer

I built another one of these for a friend who'd destroyed one by letting batteries leak inside it.... I used a generic Ebay LDR and an ordinary low efficiency green 3mm LED. I breadboarded it first, since I wanted to tweak the bias for a different supply voltage. The critical thing is to get the col...
by mictester
04 Jan 2020, 17:57
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Rams Head Big Muff FS36999 hFE measured
Replies: 15
Views: 8948

Re: Rams Head Big Muff FS36999 hFE measured

I have built various versions of Big Muff with lower gain transistors - 2N2222A and 2N3904 - and really liked the results. But then I usually play them at lower gain levels, ie gain not much further up than 8-9.00. The lower gain trannies give a smooth, fat buttery sound rather than the buzz saw of...
by mictester
29 Dec 2019, 06:29
Forum: Ready-To-Build Effect Projects
Topic: Really Cheap Compressor [verified]
Replies: 411
Views: 27039

Re: Really Cheap Compressor [verified]

BIG NEWS!!! I've finally found a Vactrol that's cheap and works well in this compressor! the part is the LCR0202 . I built two compressors using this part, and they sound really good. These boxed Vactrols don't let light in, so testing the board outside the case is easy! I got mine from Ebay (for a...
by mictester
29 Dec 2019, 05:55
Forum: Ready-To-Build Effect Projects
Topic: A Switching Scheme
Replies: 245
Views: 20081

Re: A Switching Scheme

Can anyone (calling out mictester) comment on why no coil suppression is employed here? Hi. If you look at the original circuit, you'll see that the relay coil is fed with a series electrolytic capacitor. The current flow through the coil is in one direction during "set" and the other during "reset...
by mictester
29 Dec 2019, 05:23
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Schaller - Fuzz (Germanium) [schematic]
Replies: 24
Views: 10057

Re: Schaller - Fuzz (Germanium) [schematic]

Use a 10k fixed resistor in series with a 25k preset trimmer wired as a variable resistor. Start with the trimmer shorted out, so the resistance is 10k. Increase the trimmer resistance slowly while playing through the thing. You'll soon find the "sweet spot"! One build I did recently for a friend of...
by mictester
26 Dec 2019, 23:22
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Pédale de Vibrato et de Super-Aigues [schematic]
Replies: 6
Views: 2601

Re: Pédale de Vibrato et de Super-Aigues [schematic]

It's NOT a vibrato - it's a badly designed germanium TREMOLO. It might (sort of) work, but there are LOTS of better circuits around to do this. The treble booster is also poorly designed and will have more hiss than signal!