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I am battling a client's science project amp repair (1970's Sunn Beta Lead solid state), where I get proper signal right up to the inverter circuit, which is clipping on both half's of the push-pull and phase cancelling the output. Thus the amp output to the speaker is almost nonexistent and...

Just a public service announcement that I discovered while building an Angry Andy: Page 1 shows the electrolytic capacitors C101, C7 and C100 with the plus side facing the bottom (switch side), which is incorrect. The PCB has the polarity correct. Go with that.

More of a question for the @Robert 's of the forum, who have the patience to reverse engineer double-sided SMD pedals. I was traded a Jetter Grissom Overdrive pedal for some repair work. It is one of the most useful OD's for those who get their sound from putting a tube amp on '7' and...

An easy way to turn your Arachnid multi-effects pedal from an 8 program effects, to 17 effects, on the fly! The stock pedal design gets its stored program instructions from IC2 24LC32A, but the FV-1 (IC3) also has 7 internal effects that are useful and musically nice. The internal effects can...

After building the Arachnid, I am finding myself wanting to expand a bit down that path. A few questions: 1.) On the Arachnid: if I install a SPDT switch and send the EV-1 pin#13 to ground via where it connects to R5, will I be able to switch between the EEPROM and the FV-1's internal...

I completed and tested a Maleficent Mids parametric EQ build today. The only change is I substituted an OPA2134 for the NE5532, because it is what I had on hand that was HiFi ish. It is a good pedal. IMHO, it needs a 'Q' control (broad or narrow on the center frequency) and I am going to take...

To @Robert or any other FV-1 experts: My first 'DSP' build is almost alive: An Arachnid V2, with a Module 8 and a custom EPROM 24LC32A (both from Pedal PCB). Additional info: FV-1 and 32.768HZ crystal from Amplified Parts. I used static protection, which includes a Spidel ground wrist strap...

Just finished an Angry Andy for a friend. Never heard the original and was impressed with the sound of this. The boost sounds like a bit of a treble boost in the sweet spot and IMHO, needs a little more dB. However, my friend wanted it built to original specs.

A friend of mine has been on a quest for the tone of a loud Fender Black panel amp, at about 70dB of real volume. Think of a Vibroverb or Super Reverb on '4' to '7'. We have tried pedals, master volume mods, speakers, expensive attenuators and various amps. Nothing got close to the nuance of a...

I watched a video about Tom's Bukovac (Nashville studio session player / sideman), and really liked how he uses the Vertex Boost with an expression pedal as a volume / boost. So, I borrowed one from a local music store that I repair for, tried it and liked it. I could not hear any difference...

I built this Marble Drive in 2022, which is based on the 'Marvel Drive', to which I call mine 'Prodigy'. It was built to the schematic and bias values people cited, which is pretty much a Marshall model 1987 / 1959 (50w / 100w), except using J-201 FETS instead of tubes. It was really hard to...

Somehow, I accidentally dropped a Spin FV-1 DSP IC into my cart while making a purchase at my electronics supply company. I had no preconceived use for this. What PedalPCB would you build with this chip?

@RobotZombie23 asked me to post this modification to a wah-wah effect pedal, as manufactured by the Jim Dunlop company (Cry Baby, Dunlop, Vox, etc). The relay is a an HK19F-HP-5V, which can be purchased on Amazon for a few $. Here is the schematic: And here is the Layout:

The two shortcomings are: 1.) 'Is it on or off,' and 2.) 'Why does it suck my tone when it is off?' This was precipitated by a client who loves his wahs. Each one he gets, he immediately asks me to put an 'on' indicator LED, which some models I can get away with replacing the DPST stomp switch...

I've seemed to run dry on sources for M7 internal-tooth lock washers, for use with 16mm potentiometers, commonly used on pedals. Any suggestions?

My DoD Chorus 690 wasn't working. The LFO, Flip-flop SAD512D bucket-brigade chip and the compression half of the NE571 compandor was operating, but the expansion wasn't and the Vcc was about +14.2VDC (below the threshold of the LM78L15 regulator). I assumed the electrolytics were all bad and...

Since this area is designated for 'reviews,' I was wondering if anyone has a pedal or two (a build or a buy) which you really thought was going to be great, but turned out 'meh'? For me, I build a Wampler Tweed '57 clone which I like the graphics I came up with, but cannot gel with the pedal...

Built to PedalPCB spec (unusual for me). Having used many UREI 1176 compressors and being underwhelmed with traditional guitar compressors (yes, even my 1982 Ross that I kept for 34 years), this pedal hits what I want in a guitar / bass compressor: big, natural sustain, with a hint of country...

Does anyone have a solution to what to use for the lead pins ('legs') on a SO-8 to DIP-8 adapter, once the SOIC-8 type IC is soldered to the adapter? I've seen some adapters sold with staged pins and I've used reclaimed resistor leads in the past. Just wondering what other builders are doing...

As you can see from the pictures below, I have the Median Compressor populated and loaded in the enclosure for functional test. FYI: I am calling my build, the 'Spirit of 1776' - a little play on the UREI 1176 it borrows from. I had a few challenges so far: - Reviewed the design, compared it...