For your tracing pleasure. I've labeled as many caps as I could. Will work on resistors when I get the chance

mofaux.rar

I can post pics to thread if needed

For your tracing pleasure. A really cool Klon variant I believe. Would love to make one of these with more real components

hippy.rar

If you like I can post the pics in thread as well.

Power supply design using calculation and diagrams.
This procedure is taken from the AUDIO HANDBOOK published by National Semiconducter in 1976.
There is also a design example in the paper.
I used these procedures many times professionally before computer aided design was available.
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PSU-Design 1-10.zip

Is this a pedal?

It does not need any power but has jack inputs.

It is a ground loop / hum destroyer (Ultra-Compact 2 channel hum destroyer) and is pretty cheap.

And the schematic:
Behringer - HD400.JPG

Full project PDF: Sperimentare-1978-07-08 Fuzz Wah.pdf

Sperimentare-1978-07-08 Fuzz Wah 02.jpg Sperimentare-1978-07-08 Fuzz Wah 03.jpg Sperimentare-1978-07-08 Fuzz Wah 04.jpg Sperimentare-1978-07-08 Fuzz Wah 05.jpg Sperimentare-1978-07-08 Fuzz Wah 06.jpg

Full article in PDF: Amaterske Radio 2004-10 Rocky heat Fuzz.pdf

Amaterske Radio 2004-10 Rocky heat Fuzz 01.jpg Amaterske Radio 2004-10 Rocky heat Fuzz 02.jpg

Fuzzes are generally distortions that produce a series of higher harmonics to the fundamental frequency. Often they are supplemented by other correction circuits.

Description
The circuit diagram of the rocky head fuzz is shown in Fig. 1. An isolating capacitor and a RF interference filter R1, C1 and C2 are connected behind the...

Full article in PDF: LED106_03-1993 Pedale Analog Echo.pdf

LED106_03-1993 Pedale Analog Echo 1.jpg LED106_03-1993 Pedale Analog Echo 2.jpg LED106_03-1993 Pedale Analog Echo 3.jpg LED106_03-1993 Pedale Analog Echo 4.jpg LED106_03-1993 Pedale Analog Echo 5.jpg LED106_03-1993 Pedale Analog Echo 7.jpg LED106_03-1993 Pedale Analog Echo 8.jpg LED106_03-1993 Pedale Analog Echo 9.jpg LED106_03-1993 Pedale Analog Echo 10.jpg LED106_03-1993 Pedale Analog Echo 11.jpg LED106_03-1993 Pedale Analog...

Hi all!

Got this pedal cheap as it 'didn't work' ==> turned out that the LED resistor was loose. The pedal works fine, just the LED didn't work.

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The schematic:
As you can spot it is a Ross Compressor clone; as I marked in RED the changes they made to the schematic. These changes don't sound really good...... my unit was really bright and 'Boring' sounding!!

EnjoY!
Joyo - Dyna compressor.JPG

Full PDF: Practical-Electronics-1972-04 Russell Treble Booster.pdf

Practical-Electronics-1972-04 Russell Treble Booster 01.jpg Practical-Electronics-1972-04 Russell Treble Booster 02.jpg

Full book in PDF: Mullard-Circuits-for-Audio-Amplifiers.pdf

Mullard-Circuits-for-Audio-Amplifiers cover.jpg Mullard-Circuits-for-Audio-Amplifiers contents.jpg

Full PDF: Everyday-Electronics-1984-06 Channel Selector.pdf

Everyday-Electronics-1984-06 Channel Selector 01.jpg Everyday-Electronics-1984-06 Channel Selector 02.jpg Everyday-Electronics-1984-06 Channel Selector 03.jpg Everyday-Electronics-1984-06 Channel Selector 04.jpg

Full PDF article: Everyday-Electronics-1980-06-07 Autowah Autophase.pdf

Everyday-Electronics-1980-06-07 Autowah Autophase 00.jpg Everyday-Electronics-1980-06-07 Autowah Autophase 01.jpg Everyday-Electronics-1980-06-07 Autowah Autophase 03.jpg Everyday-Electronics-1980-06-07 Autowah Autophase 04.jpg Everyday-Electronics-1980-06-07 Autowah Autophase 05.jpg Everyday-Electronics-1980-06-07 Autowah 01.jpg Everyday-Electronics-1980-06-07 Autowah 02.jpg Everyday-Electronics-1980-06-07 Autowah...

I really enjoy this pedal! I have it now for some years and I'm drawn to the sound, the ease of use and the way you can store 2 presets very easily.
It has a really big range with the boost switch and the hi / lo switch.

By idea, this pedal is a very early DSP Pedal..... so very little to mod or adjust. Even the switches on the back do alter something in the DSP section

(and I think all pedals from this range have the same PCB, just a different program running)

On guitar it is quite OK...

After publishing the weird article about the Harmonaphone, I googled the name of the designer and found a family website. Part of the website is written by Malcolm P. Hamer and details some of his guitar effect inventions , among which this automatic wah circuit. He writes:

AUTOMATIC WAA-WAA OPERATION

The wah-wah pedal (sometimes spelled waa-waa) was created by Brad Plunkett at Warwick Electronics Inc. in November 1966. A patent for the pedal was filed on 24 February 1967 and, that same...

Full article in PDF: Practical-Electronics-1983-09 Active Tone Controls.pdf
Practical-Electronics-1983-09 Active Tone Controls 01.jpg Practical-Electronics-1983-09 Active Tone Controls 02.jpg Practical-Electronics-1983-09 Active Tone Controls 03.jpg

aspen-duotonic-620x420.jpg
An audio equipment designer, consultant, and long-time guitarist, 34-year-old R. Aspen Pittman is the president of Groove Tubes , which supplies tube sets based on the philosophy that matching their functional characteristics optimizes an amp's performance. He was the sales manager at Los Angeles' Guitar Center for four years, director of marketing and artist relations for Acoustic for seven years, and through his firm, Aspen & Associates, he has served as equipment...

PDF: Le Haut Parleur N°1078 aout 1964 Vibrato.pdf

Le Haut Parleur N°1078 aout 1964 Vibrato 01.jpg Le Haut Parleur N°1078 aout 1964 Vibrato 02.jpg

Full article in PDF: Practical-Electronics-1969-08 Spring Reverberation Unit.pdf

Practical-Electronics-1969-08 Spring Reverberation Unit 01.jpg Practical-Electronics-1969-08 Spring Reverberation Unit 02.jpg Practical-Electronics-1969-08 Spring Reverberation Unit 03.jpg Practical-Electronics-1969-08 Spring Reverberation Unit 04.jpg Practical-Electronics-1969-08 Spring Reverberation Unit 05.jpg Practical-Electronics-1969-08 Spring Reverberation Unit 06.jpg

Great sound overdrive

I use this in all my active instruments, and also in some outboard 9V battery powered boxes. The Indicator flashes green about once per second to remind you that your electronics are powered on. When the battery drops below 7 volts, the light turns solid red.

The Indicator draws a very tiny amount of current from the battery (just 30 microamps while the battery is good), so it won’t drain it while monitoring it.

I think it would make a fun first-time surface mount project, since only one...

Full article in PDF: Practical-Electronics-1979-07- Switched Tone Treble Boost.pdf

Practical-Electronics-1979-07- Switched Tone Treble Boost 1.jpg Practical-Electronics-1979-07- Switched Tone Treble Boost 2.jpg Practical-Electronics-1979-07- Switched Tone Treble Boost 3.jpg Practical-Electronics-1979-07- Switched Tone Treble Boost 4.jpg Practical-Electronics-1979-07- Switched Tone Treble Boost 5.jpg

The Kmise Hot Plexi is a cheap mini pedal that I've seen being sold under various brand names.
The metal enclosure is nice and sturdy.
It has a JRC386 and a JRC4558D.
It's closest inspiration is obviously the Joyo Hot Plexi (see the Joyo - JF32 Hot Plexi thread).
So it looks like it's a clone of a clone (of a clone?).
Soundwise it's exactly like the YT demos of the Joyo Hot Plexi.

Here's some photos
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Full article in PDF: Led 166 July-Aug 2001 - JazzWah.pdf

Led 166 July-Aug 2001 - JazzWah 1.jpg Led 166 July-Aug 2001 - JazzWah 2.jpg Led 166 July-Aug 2001 - JazzWah 3.jpg Led 166 July-Aug 2001 - JazzWah 4.jpg Led 166 July-Aug 2001 - JazzWah 5.jpg Led 166 July-Aug 2001 - JazzWah 6.jpg Led 166 July-Aug 2001 - JazzWah 7.jpg

Is this the correct schematic for a Fender Deluxe 90 Footswitch? If so what is the input at +/- ? Since I'm trying to figure out how this switch works...

If Someone has the schematic of Vox tone garage pedals, please share It here.

Thx