PDF : Everyday Electronics 08 1979 9V supply.pdf

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Full article in PDF: Everyday-Electronics-1983-06 Bass Envelope Shaper.pdf

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Just noticed a 'do it all' pedal called the Baatsin that has a rotary switch, supposedly pre-configured for 8 different overdrive sounds.
Supposedly:
T.OD: Timmy OD,
Sweety: Sweet Honey,
B.Boost: BB Preamp,
T808: Tube Screamer,
Overdrive 1: Nobles ODR-1,
Crunchy JCM? AC30?
Rioter: Riot
O.C.Drive: OCD

I say 'supposedly' cause it seems unlikely that such different topologies could be covered by a single rotary switch. And of course a single tone control won't cover the multiple...

I'm seeking for this pedal since a while. I only know it's a relative of the Roland AF100 BeeBaa (fuzz only, without the booster).
I was able to find a gut shot on reverb, and by roughly comparing it with a regular Roland BeeBaa schematic, I came to the conclusion that it shall be something like this.
PCB is double sided, so I can 't properly tell all the connections.
What do you think?

Full PDF: Practical-Electronics-1970-07 Waa Waa.pdf

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I have just finished up another project for the DIY community that I am calling the Spare Room. It is based on valvewizard's Equinox II reverb, but with a few notable changes. The first is that I take the output of the first delay stage, low pass filter it, and feed that into the input of the second delay stage to create an additional delay stage to help thicken the reverb a little. The second thing I did was address the metallic ringing effect that it has. I did this by introducing an LFO on...

I finally caved and bought a MojoMojo to trace (also to test out, but mostly to trace). I knew it was the same overall design & PCB as the Dark Matter which I traced about a year ago so I figured I might as well give it a go to see what the differences are.

I also wanted to test a claim TC Electronic made. They say ...the fact that we use a special circuit that ramps up the voltage to more than 3 - 4 times the amount of your typical drive pedals , it turns out this is a lie. The whole circuit...

Full article in PDF: Everyday-Electronics-1974-01 VCO.pdf

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Traced this Kay Effector PCB layout from Google. Sorry it's a bit cramped.

I believe the op-amp is an MC1458, there is an unknown transistor in the LFO section that the PCB layout labels K9. I assume it's a PNP BJT just I can't say for certain. The speed pot is an unknown value though I assume it's similar to the one found in a Vox repeat percussion. Volume and tone values are also unknown, as well as the placement of the tone pot in the circuit though I assume it's on the volume pot input....

I've had this one for a while, was working perfectly but now i get low output and the effect drops volume when engaged, bypass works, the Chorus/Vib/Trem modes all work but the sound has a very loud bass thump to it.

I've attached a schematic i've found, I suspect the first Transistor because the LFOs all work and the leds behave normally, anything other i need to check just in case ?

Complete article in PDF: Radio Elettronica 1979_09 Fuzz preampli.pdf

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I have been given a Boss NS 2 Noise Suppressor which is damaged, 4 wires are not connected to their respective tags on the jack's. Is this correct

Green from 6 on the PCB to Send jack

White from 2: to Output jack

Red and black to 9v Battery connector

This is another cheap Plexitone clone like the Mosky Plexi-m and the Caline English Man.
I'd say this is the best of the bunch, IMHO.

There are two interesting things with this pedal:
1. The PCB says CP-14 Caline CP14 v2.1 2018/11/12 .
2. To generate the -9V from a 9V supply, it uses an XLSEMI XL6008E1 instead of the usual 7660 or 1044.
I haven't seen one of these in pedals before.
Note the inductor in the photos. This thing's oscillator frequency is 400kHz.

Since the components are SMD, I...

Trace of a 'Stax Master' designed by Lee Anderton & Sean Michael. The printing on the enclosure suggests that it's painted by Tayda or a company which uses the same printing method.

Op-amps are SMD 4558s. Whole board is SMD actually so I couldn't get capacitor values for everything.

The TS side is pretty boring but the BB side is cool if not a little dark.
White side is first in the chain, and is followed by the Black side.

Overall it's extremely average in all regards.

PDF: HP1665_02-1981 Frequency Doubler.pdf

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Translation published in; Haut-Parleur, 1981

PDF: Practical-Electronics-1965-09 Tube Tape Echo.pdf

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Full project in PDF: RC-1971-12 Vibratron Vibrato Unit.pdf

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Complete PDF for this project
Guitar: Practical-Electronics-1965-01 electronic guitar part 1.pdf
Amplifier: Practical-Electronics-1965-02 Electronic Guitar Part 2.pdf

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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

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

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

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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...