I had wanted to make a compressor circuit for a long time, because it's a popular and somewhat easy to make effect, but the existing DIY offer left something to be desired. You should be ready to accept some compromise, in the form of: noisy and hard to find OTA chips; expensive and hard to find (in THT at least) VCA chips; hard to find (again in THT) and fiddly JFETs; circuits that underperform in some way or another, or; circuits that aren't well translated to instrument input and stompbox...

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.

Bender 1.jpeg Bender 2.jpeg Bender 3.jpeg Bender 4.jpeg JHS Bender Schematic.png

Here is my trace of the JHS Bender. I was interested in the way that he got germanium sound from silicon transistors so I thought I would give tracing it a go. I measured all of the resistors in the circuit, and the values seemed to make sense so I didn't cut any traces. I did however, cut all the traces around the capacitors to measure them so I know they are correct.

While tracing, I removed Q2 in order to...

Hi,

i'm the founder of LEMON Amps , and here is the schematic of the Fly Classic. A 40w classic amp in a 125b
CF04F668-6F3A-4921-829A-677874B3FDC0.jpg
64E85B13-517E-4C02-985B-CAD0955C8875.jpg
Fly Classic-Schematic.pdf
Fly-Classic-layout.pdf

Cheers

Hi all,
I own since ages this Dunlop CBM95 Mini Crybaby, which I love it as it is super compact and space friendly.

Lately I opened it to apply few mods (beside the 3DPT switch with bypass status LED which I already did years ago).
I didn't really trace the circuit, but from the components and values I saw, I think the schematic is the same one as the Crybaby CB95 with the input buffer and MPSA18 transistor.

In general I wasn't able to have a reading of the capacitors (beside the 220nF and...

ul_tds1.GIF
ul_td1.GIF

ECC83/12AX7 real tube inside, high quality components make it much different with other overdrive pedals, transparent and warm sound with extremely low noise, try the tube drive if you're fans of Gilmour or Johnson. For sophisticated user, the board level bias trim could adjust the tube plate voltage to have different experience.
The wall warts power adapter is removeable, it's convinient to pack up the pedals.
Moreover, it could be the smallest real tube drive...

Hi,

i'm the founder of LEMON Amps , and here is the schematic of the Hammer Fuzz.

Hammer Fuzz.pdf

Cheers

Here is the latest - the Baja 59 Tweed Bassman 9v pedal.
Enjoy :wink:
bajaman
Baja 59 Tweed Bassman amplifier overdrive 9v 090318.GIF Baja 59 Bassman layout 090318.png Baja 59 Bassman vero cuts 090318.png parts not on board.GIF

I read somewhere that this was a bd-2 clone or variant. Looks and sounds like a modded blues breaker with more distortion. There’s alot of gain in tap. I was suprised to see the two trim pots when I opened it up. Suprised they went through the trouble of sending the ic as well. Not sure if I’m gonna keep it or not As I don’t really need it and definitely doesn’t sound like a bd2 to me. Atleast not one I’ve played.

Thoughts?

Hi,

i'm the founder of LEMON Amps , and here is the schematic of the Night Screamer.

Night Screamer-V2.pdf

Cheers

Hi,

i'm the founder of LEMON Amps , and here is the schematic of the T bone Distortion.

T-bone.pdf

Cheers

Hi,

i'm the founder of LEMON Amps , and here is the schematic of the Dirty Booster.

Dirty Booster.pdf

Cheers

I am looking for carbon comp 1/4w 1k ohm resistors and am unable to find any online. Can anyone point me to a supplier for these. I really only need one for a pedal repair but figured I would pick up some extras to have on hand.

Thanks,
George

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...