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Yep - not all the LT1054's are the same and not all the 7660's are the same, when it comes to hearing sub harmonics of the internal clock / switching oscillator. IDK if it is shielding, filtering or both. All will step up the voltage exactly the same, but only particular suffix types will be...

I've restored one around 2017. Any parts in specific?

If you are looking to learn via a science project, keep following the prior advice. However, if you are just in need of a quick and reliable signal generator, there are a few good free phone apps. I use 'PA Tone' with 1/8" plug into my phone's headphone jack, terminating to an RCA / 1/4" plug...

FWIW: I typically measure the forward voltage of the clipping device using the diode setting of a DMM and make decisions on matching, symmetry, how high, etc.) on that. Again, I am not a 'curves' guy with pedals, as the range of signal voltage and amperage is low making the audible (feelable?)...

I have not tried the SiC Schottky diodes, which seem to have a slightly higher Vf than he 1N4148 Si diodes. When I want a subtle increase to Vf, I generally put a 1N5817 Schottky in series with the original clipping device. FWIW, I am not one of those who can hear or feel the difference...

Hey @jcpst, the 5F2 with a 12" is a pretty decent start and a very useful amp. Will rock with or without pedals! Always keep in mind 'Danger - High Voltage.' Pedals don't bite, but tube amps can take away yoru birthday very easily. Double check your work, especially the electrolytic...

I wonder if they sell something similar for a Weller WLC100? That looks mighty useful.

No problem - I assumed (wrongly) that the schematic on the first page was that. R9 on your schematic cannot be omitted and the resistor being talked about here is already omitted from that Muroidea design. The Mouridea looks somewhat like a clone of a Rat 1.

Omit R15, not R9. R15 is a 10K resistor between signal in ground, in parallel with the Volumen pot which is 100K signal to ground. R9 (1K5) in the filter circuit can be eliminated by using a jumper wire, but that would just shift the frequencies to be a bit brighter. IMHO, it is already too...

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...

Thank you for the compliment! Actually, the finish started with scuffing the pedal diagonally to achieve a consistent shine with a 400 grit wet sand. Degreased with Naptha and washed with water. Then, three light coats of Krylon Fusion 'Gloss Red Plum', let cure for four days. Then...

This is a gut shot during functional test, before I swapped out the TL072 ICs for the Burr-Brown OPA1678 ICs.

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...

@jwin615 had the correct answers, IMHO. FYI: Like the original RATs, I typically do not build my versions of RATs with R15. For my taste, it drives output impedance to around 9K. I go with the straig up 100K level (volume) pot and enjoy the extra boost at lower gain settings. I personally...

That concept can be expanded, from utilizing relays to venturing into digital switching and pre-set memory storage. An example of the latter, would be the JHS 'Muffelletta.'

I am a 'keep it simple - keep it musical' player, recommending you don't bother with strapping the pot with a resistor to make it more like a 250K and get fast on the tone pot instead. Quickly setting it on '8' from '10' will achieve the same effect as strapping the pot. Theory behind that...

Having one source to ground and using the 'star' technique reduces the likelihood of ground loops. That said, eddy currents which are exasperated by ground loops, are a condition of mixed metallurgy (copper meeting aluminum, for instance), either different metals or different density (an alloy...

Exactly. I understand slew rate to be how much voltage can change in a uS and stay linear and not sag. Most dual op amps are rated between 28VDC and 36VDC, with many exhibiting crossover distortions as the signal goes rail-to-rail. 40V / uS in theory, means the device is not capable of going...

Great and informative reply! It is amazing that some of these slew rates are higher than the IC's rail to rail max voltage supply. At 61, my hearing is flat to 12KHz and through countless hours of studio work, I can focus on minutia. That said and simply in the realm of effect pedals, I find...

The JRC4559D is made from unicorn dust and the RC4559D is made from dehydrated dragon's breath. Kidding aside, 4558s are pretty much made today from bi-polar substrate, die and film clones of either the Texas Instruments RC4558 (briefly LM4558) or Japan Radio Company (JRC) NJM4558's. New old...