Search found 1927 matches

by mictester
15 Feb 2021, 01:55
Forum: DIY Stompbox designs
Topic: Treble Booster - Everyday with Practical Electronics 1995
Replies: 2
Views: 1222

Re: treble booster everyday with practical electronics 1995

It's a great little circuit. You can add more capacitors (switched in as necessary) to shift the frequency of operation.
by mictester
15 Feb 2021, 01:53
Forum: Davidoff Library
Topic: R. Penfold, 'Soft Distortion Effects Unit,' in: Everyday Practical Electronics, January 1993
Replies: 1
Views: 199

Re: R. Penfold, 'Soft Distortion Effects Unit,' in: Everyday Practical Electronics, January 1993

There are a few improvements that can be easily made to this circuit: Make R3 a 50k or 100k pot in series with a 10k resistor - this will give variable sensitivity / distortion. Put a resistor in series with the diodes - 1k up as high as 10k - which will further soften the nature of the clipping. In...
by mictester
14 Feb 2021, 23:56
Forum: Open Source Projects
Topic: 1972 Baby Phaser [documentation]
Replies: 0
Views: 582

1972 Baby Phaser [documentation]

The circuit I've just drawn up (see below) was my first attempt at a phaser way back in 1972. The circuit was developed at Texas Instruments in Manton Lane, Bedford (where I worked for a while as a student). In those days, I used 741S "low noise" op-amps. The whole circuit works from a sin...
by mictester
11 Oct 2020, 23:06
Forum: Pimp-My-Cheap-Pedal
Topic: "MXR distortion iii " Any tips for modding and improving tone
Replies: 1
Views: 348

Re: "MXR distortion iii " Any tips for modding and improving tone

Buy or build an OCD. It's a trivially simple circuit, and should cost about £10 to build if you have to buy all the parts. The circuit and layouts are on this site.
by mictester
11 Oct 2020, 23:04
Forum: Boutique Stompboxes dissected...
Topic: J. Rockett Ape - tiny tape heads??
Replies: 6
Views: 1024

Re: J. Rockett Ape - tiny tape heads??

We really are scraping the bottom of the barrel for ideas if all they can come up with is a tape recorder emulator!
by mictester
24 Aug 2020, 03:05
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Schematic for weird vintage homemade fuzz box found on eBay.
Replies: 10
Views: 1573

Re: Schematic for weird vintage homemade fuzz box found on eBay.

It goes between the wiper of the pot and the common of the switch. When in "Fuzz" mode, the capacitor is connected to the junction of the output resistors. It stops the bias of the transistors being changed as the control is rotated in "Fuzz" mode, and also applies a measure of f...
by mictester
23 Aug 2020, 03:14
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Schematic for weird vintage homemade fuzz box found on eBay.
Replies: 10
Views: 1573

Re: Schematic for weird vintage homemade fuzz box found on eBay.

Your C2 is in the wrong place. It should be in series with the wiper of the pot. It's worth experimenting with the value of C2 - 1n (as recommended) gives a thin, reedy tone. Increasing it brings you towards Fuzz Face territory, though with a different edge to the sound. The 68k and 10k resistors at...
by mictester
11 Jun 2020, 16:48
Forum: Open Source Projects
Topic: Really Cheap Compressor [documentation]
Replies: 414
Views: 47342

Re: Really Cheap Compressor [documentation]

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, 11:23
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 167
Views: 66951

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, 09:32
Forum: Parts & Tools Sourcing & Trading
Topic: Resistor type in Eric Johnson Fuzz Face?
Replies: 6
Views: 1717

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 &q...
by mictester
20 Apr 2020, 09:14
Forum: Pedal Debugging & Troubleshooting Support
Topic: Weird behavior Dunlop JH-2S Classic Fuzz Face
Replies: 6
Views: 787

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
19 Apr 2020, 23:09
Forum: Parts & Tools Sourcing & Trading
Topic: MN3007 GENUINE
Replies: 2
Views: 731

Re: MN3007 GENUINE

Wow! £10 each! I have several tubes of 50 per tube.... I'm RICH!!!
by mictester
19 Apr 2020, 00:13
Forum: Boutique Stompboxes dissected...
Topic: Fulltone - OCD [traced]
Replies: 570
Views: 207115

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, 01:23
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 167
Views: 66951

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, 11:22
Forum: Boutique Stompboxes dissected...
Topic: Solo Dallas - SVDS Replica [traced]
Replies: 167
Views: 66951

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, 03:08
Forum: Boutique Stompboxes dissected...
Topic: Keeley - Fuzz Bender [traced]
Replies: 39
Views: 8030

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, 20:28
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread CB30 [traced]
Replies: 85
Views: 30118

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 longe...
by mictester
02 Mar 2020, 02:07
Forum: Boutique Stompboxes dissected...
Topic: Keeley - Fuzz Bender [traced]
Replies: 39
Views: 8030

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, 17:17
Forum: DIY Stompbox designs
Topic: Anyone successfully tried the Coda Effects relay switching?
Replies: 25
Views: 10023

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 deactiv...
by mictester
30 Jan 2020, 12:08
Forum: Open Source Projects
Topic: Really Cheap Compressor [documentation]
Replies: 414
Views: 47342

Re: Really Cheap Compressor [documentation]

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!