Hi all,

I'm keen on building the Solid Metal Pro. Going through the needed parts right now and I'm stuck at the jacks.

The build doc is here .

The doc just says 2 audio jacks in the shopping list. But there are also the following jacks which can be connected to the PCB:

Sidetrack loop jacks
Universal loop jacks
Boost Loop jacks

I'd definitely like to add these jacks as well. But I'm not sure what jacks are needed.

Can I use 2 normal mono jacks and 6 stereo amp style jacks? Or do I need...

Добридень or hello everyone!
I decided to make an overdrive on 2n7000, because apart from Zvex SHO, I no longer met the use of these transistors in guitar circuits. The circuit is built on 3 transistors, a green LED is used for bias.
At first, I designed the circuit in LTSpice, but then I adjusted the sound by ear.
I don't play the guitar well, but you can get some ideas about the sound from the video :D I also speak Ukrainian in the video, so maybe not everyone will understand :D
The initial...

Hi to all.
Fuzzface has undergone so many modifications, so only mine is missing :D
I set out to redo the fuzzface in a way that would be easy to repeat and not sound as sharp as the silicon transistors. Therefore, I decided to add zener diodes between the base and the collector and it softened the sound. Also, the capacitor at the input is also of reduced capacity so that there is no excess of low frequencies.
Here is the modification scheme:

And here is the video:

Criticism and...

Good day L & G,
I was looking for suitable candidate for my bench amp and I found schematic of Roland Jazz Chorus JC-20 from this japanese website :

Looks like this is the one and only JC-20 schematic on the interweb. Anyway, from his article, I got impression that the guy who trace it are surprised that this kind of circuit are released into final products, so probably there's something weird into this circuit.

I did my research based on several another article & gutshot pictures of the...

I went on to try to find a matching pair of diodes for one of my built.
Long story short, I ended up measuring and testing a good part of all odd diodes I have had accumulated over the decades of tinkering.

Some are germanium, some are silicon, including Schottky, etc. I won’t talk about whether any of these sound “smoother”, “warmer”, “rounder”, “fuller”, etc. I don’t believe in tone wood either; nor that a measured 33nF cap will sound different than any other. Disclaimer being out of the...

Hi good folks,

I have the present circuit on my breadboard, and I would like to submit it to more experienced minds to see if there is any major flaw. My knowledge in electronics is purely DIY, on-the-go acquired, so even though my reasoning appears, ahem, reasonable, I'm always afraid to miss something crucial. So far it sounds nice to me, will probably mess with the tonestack and a few other values, but before going any further I hereby submit it here for criticism and observations.

I was...

I've made a huge mistake.

I wanted to be able to use the power plug instead of the battery, but the power jack wasn't working. These have a plug style that looks like a headphone plug. I opened it up, made some very minor changes to the power wiring and now that power jack works.

Fast forward a few months and one day my PDS 1700 makes no sound. I try battery power, and plug power, and I desperately try and remember exactly what I changed with the wiring. I don't remember what I did. I have...

Maybe I am blind, but how are IC1 and IC2 biased? IIRC the original schem has them at bipolar 15V, but on the build docs they seem to be at 24V-gnd. I cannot see any Vref connection. Will it work as intended without a midpoint bias?
Thx in advance!

Guys,

below some line6 M9 gutshots. I need to opened it to replace a bad LCD and took some pictures.
The M9 schematic is attached as well.
Maybe it help somebody.

Cheers,

Vanderson

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Everything works great!

Except...the LED won't light up.

I cant see why, I've tried different leds, and verified they worked before and after install but I cant get the led to work in circuit.

that's the schematic. I really cant figure out why it wouldn't light up.

Are the inputs and outputs reliant on ground to make sure the led lights up? I'm just using the main I/O not the stereo, there is nothing on those solder pads.