Hello all.

I recent spent a Whopping $10 for a UT-300 Ultra Tremolo.

Great sounding tremolo, but does anyone know how to modify it to make the LED flash at the tremolo rate?

Thanks

I traced Exar FL-1 Flanger from my collection 🎉. The unit should have been made in 1989 or later due to the dates on the pots (09-89). I even have the box 😅.

PXL_20221219_211836112.jpg

This trace was quite challenging due to amount of components on the small single-sided PCB.

PXL_20221217_195623135.jpg
PXL_20221217_191615264.jpg

As I started, I immediately realized that it was based on... Boss BF-2. But when I went to the LFO section, it was completely different. So it is definitely...

Hi all!

Just got this wah for cheap as the switch was dead.

Inside is a nice wah pedal! I replaced the switch with a qualitu TPDT, now it rocks!

(pics are on my instagram)
Rocktron - Classic Wah.JPG

I'm continuing to trace Exar pedals from my collection. This time it's FL-1 Enveloper filter. I have 2 of them, both made in 1993. I traced the one with the worse cosmetical condition because its paint was very fragile. The nicer one is on photos, with the box, warranty card, and instructions.
PXL_20221206_135104506.jpg
PXL_20221206_135123013.jpg
PXL_20221206_135143814.jpg

The PCB is a small single-sided; I traced it pretty quickly. It has two HEF4069UBP by Philips and one Motorola...

If a moderator wants to delete this thread for not being stompbox related then I totally understand.
Could you please let me know your specific reasons though?
Why am I posting this here?
[] I don't think that posting this to a computer-related forum would succeed - business interests would prevent it from seeing the light of day.
[] This forum supports the free exchange of information AFAIK.
[] It might benefit some forum members that use Windows Media Player.
[] Tenuous link - When you listen...

Hi all,

I picked up a faulty EBS Octabass pedal. It works, but when you are not playing, there are constant blips/bops. Essentially, if you even touch a string, you get some signal being generated. Sounds as if the issue I have is very similar to the one described in

I've done a fair amount of reading, and recall somewhere that it could be a pull down resistor (which seems logical to me). Is there an easy way to find which resistor it is from a schematic (the schematic is on the forum)?...

I needed an expression pedal and boy, this one is cheap!

M-audio - EXP pedal.JPG

EDIT: I found that I did already have a cable but I'd still like to know if the connector is something I can buy so I can make a 2nd cable.
Condor_Cable.jpg

I'm already searching doggedly, but I can't find a circuit diagram for this device. Maybe someone has such a circuit?

Hi.
A friend lent me this pedal, I wanted to see what it was.
Basically a rat with input buffer and two separate controls for dry and wet volume, and probably an extra output boost too (that I didn't trace).
The most interesting part was the gain/frequency resistor and capacitor (330 ohm and 6µ8, to save you some time) but what took me a really long time is what looks to me as a very elaborate clipping switch and volume control for LED clipping (controlled by the internal trimpot, described by...

Le HAUT-PARLEUR 18 Avril 1968 Générateur de distorsion.pdf

Le HAUT-PARLEUR 18 Avril 1968 Générateur de distorsion.jpg

PDF: RP219_01-1966_A_REFAIRE Reverberation modulation.pdf

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01 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 02 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 03 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 04 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 05 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 06 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg

Radio-TV-Experimenter-1967-12-01 Universal Reverb.pdf

01 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 02 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 03 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 04 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 05 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg

PDF Poptronics-1968-01 Meyer Reverb Adapter.pdf

01 Poptronics-1968-01 Meyer Reverb Adapter.jpg 02 Poptronics-1968-01 Meyer Reverb Adapter.jpg 03 Poptronics-1968-01 Meyer Reverb Adapter.jpg 04 Poptronics-1968-01 Meyer Reverb Adapter.jpg

PDF: RC-1963-03 Simple Echo Chamber.pdf

01 RC-1963-03 Simple Echo Chamber.jpg 02 RC-1963-03 Simple Echo Chamber.jpg 03 RC-1963-03 Simple Echo Chamber.jpg

PDF: Radio-Electronics-1962-01 Reverberation.pdf

01 Radio-Electronics-1962-01 Reverberation.jpg 02 Radio-Electronics-1962-01 Reverberation.jpg 03 Radio-Electronics-1962-01 Reverberation.jpg

Full article in PDF: Pop-1960-12 Controlled Reverberation.pdf

Pop-1960-12 Controlled Reverberation schematic.jpg

PDF: Electronics-World-1966-10 Simplified Tremolo.pdf

Electronics World Vibrato.jpg

PDF: Radio-Electronics-1951-02-OCR-Page-0082.pdf

Radio-Electronics-1951-02-OCR-Page-0082.jpg

PDF: Radio-Electronics-1966-11 Thunderbox Booster.pdf

Radio-Electronics-1966-11 Thunderbox Booster 01.jpg Radio-Electronics-1966-11 Thunderbox Booster 02.jpg

PDF: Hobby-Electronics-1982-12-S-OCR Phase Four.pdf

01 Hobby-Electronics-1982-12-S-OCR Phase Four.jpg 02 Hobby-Electronics-1982-12-S-OCR Phase Four.jpg 03 Hobby-Electronics-1982-12-S-OCR Phase Four.jpg 04 Hobby-Electronics-1982-12-S-OCR Phase Four.jpg 05 Hobby-Electronics-1982-12-S-OCR Phase Four.jpg

Edit: in the drawn PCB view the polarity of the unidentified protection diode was upside down, now it is corrected.
I replace it with a 1N4001 diode
I bought this defective Amiko NSG-2 noise gate pedal, it is identical in design to the PSK NSG-2 pedal.
Since I could not find a schematic, I drew it out by tracing the circuit board.
This pedal is a BOSS NF-1 noise gate clone.
Differences are:
External power supply through a DC adapter instead of a DC adapter.
C=47n instead of C=100n and R=470k...

Hi guys. I am trying to replace an Alpha 9mm D-shaft PCB mount C500k pot on a pedal, anyone knows where can I order one? I have been googling for two days with no luck :(

Similar to this design but D-shaft version:

Thanks for the lead in advance.

Hi!

I just got one in, and as being a fan of these CMOS pedals, I needed to trace it!

For pics just take a look at my instagram; User: bernardduur

Hot Tubes Nano.JPG

PDF - Radio-TV-Experimenter-1966-06-07 Audio Compressor.pdf

Radio-TV-Experimenter-1966-06-07 Audio Compressor 1.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 2.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 3.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 4.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 5.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 7.jpg