PDF: ETI-1980-04-80 UK Preamp and Power amps.pdf
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Hello folks,

I just modded my Boss MT-2 Metalzone to the Diezel Mod specs, but I keep seeing 2 different values for C42 cap posted in various posts online.

The posted values are either:

C42 - 0.1uf

or

C42 - 1uf

Which one is correct? I currently have .1uf in the pedal. If I change it to 1uf, how will it change the sound?

Thanks!

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....

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...

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...

20200614_163920.jpg 20200614_163414.jpg
20200614_164905.jpg

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...

IMG_20220518_204027.png IMG_20220518_204114.png

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...

Hi all, I am building a dual overdrive. I would like to include effects order toggle switch to change which effect is first. I am clear on how to do this using a 3PDT toggle.

I would also like to be able to insert an external pedal in between the two circuits. I am not clear on how to do this and still retain the order switch. I could do it manually with two independent circuits, individual input and output jacks, using a switching jack and patch cables to insert an external effect AND/OR...

Did a search and can't see anything specific for this

Here are some Pics
IMG_0195.jpg

IMG_0197.jpg

IMG_0201.jpg

Discofreq please feel free to use these on the effects database

Hey folks!

Andy and I have been working on the Guyatone Fuzz Monster. I did a thread on some of the Guyatone FLIP series pedals a few weeks back at diysb, and one by one, we'll dissect them, and post the traces as we go. I have a Fuzz Monster, and Hell Monster on hand, and a Funky Box on the way from Japan. I'll be cracking them open as we go down this FLIP'd journey (pardon the pun :mrgreen: ).

For now, here is the schematic, courtesy of UKToecutter (Andy);

Please note that the power...

Got it from someone that said they used the wrong power supply. What is the label on D6? Is it 5A9D?

6E75F7BF-6761-4771-AB0E-DF85838F9AC6.jpeg

I have extra boards from some pcbway orders that I've decided to offer up stateside.
●●●this is for USA shipping only●●●

They are all verified.

There's multiples of each pictured.

$5 shipping included will get you whatever boards you want, up to one of each design.

To be clear for $5 you can get all 5 boards shipping included.

●●●this is for USA shipping only●●●

I'm open to trades for boards that you have extras of.

Pm me if interested.

20220520_144152.jpg
MXR Blue Box

Mesa...