Howdy

I would need help to understand if this pedal that was sold to me, has or not a problem
Basically if I connect in a series guitar amp effect, the mono output has a fairly low volume.
If I plug in the output next to stereo, the volume is ok.
There is a pronounced decrease in volume both in bypass and with the pedal on, the trimmer gain compensates for this drop.
But, as mentioned, the volume on the stereo input is ok.

In case I connect the pedal in loop instead everything seems ok.
The...

Hi,
I bought a PCB for an overdrive. When I have the PCB fully loaded I want to be able to swamp out different transistors to see which ones measure and sound best. The transistors will be in TO-92 format. Does anyone make a solderless socket I can initially attach to the PCB to use to swap transistors? Then I'd remove the socket and solder the best ones in.
Thanks
Lee G.

Built out a janglebox using the lm13700 layout and not getting expected behavior.

Getting a mis-biased type sound, with sound only kicking in with louder notes and decay sputtering out then abrupt silence.

Video here:

Pictures of top and bottom of board:

Pins 3 and 4 are giving me an expected voltage reading of about 2.92v with a .02v max differential between them. Pin 1 is 1.31v with attack at max and 1.20v at min.

Issue seems to stem from pin 5. Getting a voltage reading of...

Hi all !
The pedal has no effect when engaged. It also has a big volume drop.
There was a shortcut due the bad shape of the Color switch. I cut the common leads and the ones at the down position and put together.

One of the transistors was dead, I put a bc239 (same pinout as the bc309's.)

I guess I can use ca3094's instead of eh1048 wich are completely impossible to find. Now there are five ic sockets for the op amps.

The ca3094 near the pot area measures 0.70v @ pin 6 with the...

Hallo everyone,
Here Gebrey
Im an expert of diy and electronic diy and Ive succesfully made more than 30 effects and some amps.

Whats going on with SHO??
Maybe my chinese supplier gave me fake BS170? Maybe almost all SHO schemes are wrong?

The problem is... volume. It seems that voltage supplied is too less even at 15V.
I barely hear something ONLY if I push 2 Tubescreamer is series into SHO (forced FET by large input voltage signal)

Ive made 5 times this circuit and every time this...

PDF: 1979-4 Guitar Expander - Electronics Today International.pdf

1979-4 Guitar Expander - Electronics Today International 1.jpg 1979-4 Guitar Expander - Electronics Today International 2.jpg 1979-4 Guitar Expander - Electronics Today International 3.jpg 1979-4 Guitar Expander - Electronics Today International 4.jpg

Hello people.

I am trying to fix a Fender practice am with a loud hum noise.
the amp works but it has a hum noise (50hz) loud even when the guitar is unplugged.

- Volume, Contour, Reverb doesn't affect the noise.

I had attached the schematic for the amp Fender R.A.D. that is the same without the reverb circuit.

I tried to connect the preamp output to another amp and the noise still there. My first thought the issue is in the power supply I changed all the electrolytic capacitors in the...

windgabgutz.jpg Hello,
I'm building a VFE Windbag and I'm having an issue.
Everything seems to be working fine, but I get a steep volume drop and a muffled under-the-blanket sound when engaged. If I crank the volume, I can hear everything doing what it's supposed to do delay, reverb, envelope, etc...just at a very low and muffled volume like a hi pass filter.
I checked the voltages, and they are a bit off, but I'm not sure what to do about that. If it matters, I subbed a TL072 for the OPA2134...

Like the F1x, was browsing and recalled that I actually bought the schematic for the Alembic onboard dual filter preamp (older version of the series onboard electronics, I think).
I'll post it here for posterity.
Quite elaborate, these basses have two pickups and a dummy coil, which needs to be carefully adjusted. They also have a second order low pass filter per pickup, with either a switch or a pot for Q . In the old days, they used a separate outboard power supply, not sure if that is still...

Hello,
I m a beginner in diy kit pedal, and I ve try the octavius kit from pcb mania.

I have some problem like no sound when I activate the pedal.

First question, how should I put the diode 1n34a ?

the two lines on the side indicated on the circuit?

it seems polarized upside down?

and I have a doubt about the connection of my switch.

if not where to look?

Thanks for your help...

Radiopratica 1970_08 Bizar Sounds.pdf

Radiopratica 1970_08 Bizar Sounds 01.jpg Radiopratica 1970_08 Bizar Sounds 02.jpg

Hello future home to my serious nerdy mind :)

I'm pretty new to circuitry. I have built some kits and recently re-housed and modified a JHF1 Dunlop Fuzz Face. Works awesome. I'm a germanium transistor collector and have learned a bunch over the past year. I just bought a Newmarket Transistor amplifier circuit (pre-made) from the 60's. The Reverb ad said something about being a Deacy amp. It has a basic schematic diagram for the wiring but I've tried a bunch of different things an I can't get...

Hallo everyone,
I started my amp builder career with ROG Ruby, then Noisy Cricket, then Tube Cricket, then I moved to higher voltage amp IC: TDA 20x0.

I've built a bridge dual supply TDA2050 AMP. Until I supplied with 36V and voltage divider (low current, ±18V) it worked as expected and louder.

tda2030-bridge-amplifier.jpg

Then I moved to transformer ±18V and 6 elna 10mF filter caps and... probably I cooked my ICs.

20230206_171832.jpg

A bit disappointed, I bought 2 modules from...