Hi,
Assembled choral board
Choral.jpg

I'm getting ready to put it together as kit in the future.
There will be two versions in preparation: MN3007 and MN3207.
Rgds,
box

Dissertation by Helmut Haas describing the Haas Effect. It includes a detailed description and diagram of a very early magnetic tape echo generator (magnetophone, a precursor to the Echoplex) that he used in the his experiments. This is the English translation, pubished in the Journal of the Audio Engineering Society.

Hi all!

I got this Headrush E1 in due to some noise. There is a lot of 'clock noise' going on: a high pitch noise that is always in your signal and can't be dialed out. Quite loud, quite apparant, quite annoying. On the mix output the noise was loud; on the 'seperate head outputs' the noise was bearable.

I fixed part of it by replacing all filter caps with new versions. With this, the noise was bearable, but still in the signal. In the end I fixed the noise by adding 10n caps to ground on the...

Hi everyone.

Since I have the Bandit 112 I Wanted to do something about the attenuation.
The amp starts breaking up (transtube) at Vol 6-7 at 25% of power level but still, too loud for home use.
I have the 2-silver stripes version:

I found on a post from 2020 a guy saying he added a master volume after the T dynamics circuit and said: it is a 47k / 50k pot in series with the feedback tail. At 50k and T dynamics at 10% one now has 0.65 crancked Watts
He also added this Schematic (red...

Just the schematic -

PDF:
boss-bf2-flanger.pdf

JPG
boss-bf2-flanger.jpg

Complete 12 page service notes in PDF:
BOSS-BF-3-SERVICE-NOTES.pdf

Full Patent Text in PDF: US3223936.pdf

US3223936 Transistor limiter amplifier.jpg

The source for this information is here . I did not discover this, but trying to create some sub text...

The patent being applied for on 23rd of October 1962, and published on the 14th of December 1965, make it a very likely source for the EHX Big Muff circuit:

big-muff-pi-schematic.jpg

PDF 24 page service notes:
Boss-dd-7-service-notes_2008.pdf

Complete 5 page Services Notes in PDF: Boss-AC-2-Acoustic-Simulator-Service-Manual.pdf

boss-ac2-acousticsimulator2.jpg

Full service notes in hi-res PDF (14 pages): Boss-PW-10-V-Wah-Service-Manual.pdf

Boss-PW-10-V-Wah-cover.jpg
Boss-PW-10-V-Wah-Schematic.jpg Boss-PW-10-V-Wah-exploded.jpg

I found no thread on the Colorsound Wow Swell, in the video below just referred to as Colorsound Wah. Nor is there a thread on the Solasound Wow Swell, which is, if I'm not mistaken, an earlier, internally different circuit with some deviations in the circuit.

Luckily AG traced the circuit, but from a pink unit?

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titukqov7yrf7zblqbye.jpg uzfyvwxsulrvegserj9y.jpg rrjev3aue9fwmd55pdpo.jpg rc6kbqzbehlkynpprzt8.jpg titukqov7yrf7zblqbye.jpg...

I'm curious about the Lyndhurst. Anyone?
Pic's aren't mine, found them here , nothing else on the internets.
Some controls appear unused on the mainboard. Dark / Flat mode and Release potentiometer.

Hi!

Just got this unit in as it didn't function anymore. Turned out to be a faulty diode.
The unit runs on a 15V power supply that is center positive.

PIcs:
20220103_092249.jpg
20220103_092258.jpg
20220102_234032.jpg
20220102_234035.jpg
20220102_234042.jpg

And the schematic:
Eden - Astroflange.JPG

Hi all,

My MXR Delay System 2 stopped doing what it should do - the signal still passes, but no delay is added.
The previous owner had it services by Charlie Chander. Capacitors and memory chips were replaced, this must have been around 8 years ago.

When I switch it on, delay shows around 2800ms, or around 1400 when I remove th extra memory module. No matter how I twist the knobs, it always stays around that same range.
I tried replacing the memory modules today, but no change whatsoever....

I have completed a new project for this wonderful community. Riptide is a real spring reverb utilizing a blue Accutronics tank. The circuit is actually rather straightforward, but I haven't seen any fully documented DIY projects for one, so I figured I would make one. The decay time is something in the 2.3-2.4 second ballpark, if I remember correctly. The tank is cheaper than a brick or an FV-1 and you can do things like tank splash if you want to. You won't get the massive splashy sounds of a...

PDF: Practical-Electronics-1967-06 Vibrato.pdf

Practical-Electronics-1967-06 Vibrato 01.jpg Practical-Electronics-1967-06 Vibrato 02.jpg Practical-Electronics-1967-06 Vibrato 03.jpg Practical-Electronics-1967-06 Vibrato 04.jpg

dudes......
wire the input and output of the board to the input and output jacks.break the connection at the c17 r8 node. add a spdt switch.
BOOM!
d'lay suddenly has tails. the thing has enough buffers in it so switching that one connection works mint.
try it and tell me what ya think.
sounds great like this. extra added bonus it's always a buffer on for the end of your chain. couple wiring mods. done.
PjP

Everyday-Electronics-1978-09 Tone Booster.pdf

Everyday-Electronics-1978-09 Tone Booster 01.jpg Everyday-Electronics-1978-09 Tone Booster 02.jpg Everyday-Electronics-1978-09 Tone Booster 03.jpg Everyday-Electronics-1978-09 Tone Booster 04.jpg Everyday-Electronics-1978-09 Tone Booster 05.jpg Everyday-Electronics-1978-09 Tone Booster 06.jpg

PDF: EPE-1993-03 Microphone compressor.pdf

EPE-1993-03 Microphone compressor 01.jpg EPE-1993-03 Microphone compressor 02.jpg EPE-1993-03 Microphone compressor 03.jpg EPE-1993-03 Microphone compressor 04.jpg

PDF : Everyday Electronics 08 1979 9V supply.pdf

Everyday Electronics 08 1979 9V supply 01.jpg Everyday Electronics 08 1979 9V supply 02.jpg Everyday Electronics 08 1979 9V supply 03.jpg

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...

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

Practical-Electronics-1970-07 Waa Waa 02.jpg Practical-Electronics-1970-07 Waa Waa 03.jpg Practical-Electronics-1970-07 Waa Waa 04.jpg

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

Everyday-Electronics-1974-01 VCO 01.jpg Everyday-Electronics-1974-01 VCO 02.jpg Everyday-Electronics-1974-01 VCO 03.jpg Everyday-Electronics-1974-01 VCO 04.jpg Everyday-Electronics-1974-01 VCO 05.jpg Everyday-Electronics-1974-01 VCO 06.jpg