PDF: Hobby-Electronics-1983-12-S-OCR Bassman.pdf

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PDF: Pop-1972-07 Optimum Fuzz.pdf

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PDF: Hobby-Electronics-1983-07-S-OCR Soft Fuzz.pdf
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This beloved amp is getting old or tired of my playing.
Plugging in into High Input and turning preamp pot from 8 to 10 behaves weirdly

loud squeal if cable is plugged in without an instrument;
with single coils middle pickup squeals and with bridge or neck pickup it has harsh sound when distorting;
with single coils turning down the tones remove the squeal;
With humbuckers there is no squeal at all;

Power tubes have been already replaced with matched EL34, bias 8uf caps replaced....

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I would have reported it as spam except that the poster has been registered for 12 years. I suspect that the account may have been hacked.

PDF: Practical-Electronics-1980-05 Split Phase Tremolo.pdf

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First post from this long time lurker. I've had this bass distortion pedal for many years, but I still haven't seen anyone checking out its circuit, so I decided to try. It's handmade in Norway by the small pedal builder OnkartGromt. Info:

Getting the PCB out of the enclosure was quite a challenge, at least without de-soldering the DC input and the two mini-switches. But I wrestled it out and took decent pictures of both sides. Figured out the circuit, whose design is far from a typical TS...

I want to make a tails switch for a DBD. There are multiple examples on the internet, but I just can not seem to get it to work correctly. Must be my lacking knowledge of transistors, so I am here to be taught :D

Attached a picture by R.G. Keen with a basic jFet switch as in boss/ibanez. If I am not mistaken when Vgs > V cuttoff the switch will be closed and if Vgs Closed
V control = ground (0V), Vref 4,5V makes Vgs 0-4,5 = -4,5V which is in the Vcuttoff range -> Open

However... which ever...

I apparently have a thing for delay/reverb circuits. I decided to do a true stereo reverb using PT2399. It's based on my Spare Room design, but it takes advantage of of the ability to cross feed the left and right signals and to do some cool cross channel-dependent modulation. It's not a small circuit by any measure. In fact, it may be the most complicated single knob pedal in the DIY world, but it's a fun one. The schematic is too big to post at reasonable quality here, but I put the short...

PDF: ETI-1980-04-80 UK Preamp and Power amps.pdf
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Total newbie here. Never used a PCB layout app in my life. I can read schems, I can build some electronic devices and paint by number DIY pedals. I'm pretty good at soldering and reworking. But I've never delved into PCB layout apps.

Here's my question:

Can PCB layout software/apps now take a schematic and Automatically create a PCB layout from it? If so do free apps do this? Do any do this? Is it possible? I get that there will always be constraints. Like: I/O placement, PCB shape, footprint...

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I like the sound of this one, sorry about the crappy pics.
I can try to take better ones when i get the time.
Forgot to take pics on the potz boards other side...

Looks like charge pump, relay switching, 3 smd jfets, two 5k trimpots for the jfets.

Pots are:
Tone a500k
Output a25k
Volume a500k

Funny double decker board.

Hi,

I've been trying to figure out how Way Huge did the Series/Parallel toggle switch in the Camel Toe, either in the original or reissue. Has anyone traced that part of the circuit?

Thanks!

hey guys
i just built one, i tried a lot of transistors and finally got some nice sound out of it. bias voltages are ok, no ugly noises on the decay
its gated in a nice way, with a hint of octave up when i back the guitar vol pot a little....
what bothers me is on a certain combination on the guitar volume pot and the fuzz''/ bias pot in produces a kind of octave down sound which is actually very pleasant
my question is whether this is normal. i havent heard of a zonk pedal doing this

i...

So I have a DL-4 that powers on maybe 1 out of 10 times. When it does power on, it works totally fine and indefinitely. Sometimes if I unplug it after working then plug it back in, it works. Most of the time it doesn't. After that, it seems like 2 consecutive times powering up is the limit. I've reseated the Eprom several times and thoroughly cleaned the pins. I reflowed all of the pins of the socket. I reflowed a few ICs around the Eprom to see if something was just making a bad contact. I've...

Hello all.

I'd really appreciate some help with my build please, if possible. I have followed the troubleshooting steps in the FAQs but nothing seems to have had any effect. This is my first build with a PCB rather than a veroboard which I though would be more straightforward. That was certainly the kiss of death!

The kit is the Supreme Compressor from Effect Pedal Kits. It is based on the Valvewizard Engineer's Thumb, with 4 control knobs.

A lot of fuzz-like distortion is being produced...

I have built an old favorite from this board, the Highway 89 from Doug Hammond. This pedal kills. The tone is rocking and ballsy and the clean up is great!!

I was trying to let the other guitar player in my band use it and I discovered a really strange issue that we have tracked down to a power issue generally but do not know specifically what the problem is.

When it is powered from my old dinosaur SKB pedalboard the pedal works fine, as it does when I use a single Boss PSA 120 style...

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Here is my latest original build. The enclosure came from a 3-knob AliExpress zendrive clone kit by Landtone. I first used it for a DIY Friedman Golden Pearl, which is why there are two extra switches. It turned out that keeping these let me design a bit more flexibility in.

MOStache schem.PNG

It's a fairly straight forward amp-in-a-box type of deal, but here I'm using P-Mosfets (hence the name) instead of Jfets because they are much more...