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Topics - JackSkellington

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General Questions / Engineer's Thumb: Is this issue normal?
« on: November 05, 2018, 11:27:11 AM »
Hello, I have a problem with the Engineer's Thumb using Sabrotone layout.
All the informations about it, here:

The effect seems work, a sort of, indeed I get the compression, but with some weird issues.
When I don't hit the strings I can hear the hiss and the volume rise up, and when I hit the strings I get a loud attack, then the compression act and I can play normally, though I got another strange thing: depends by the settings, but if I hit the strings harder the compression low the volume more than when I play softly.
I think this depends from the volume that rise up too much, it cause the loud attack and the loud volume when I play softly.
This issue cause a third problem. When I wired it into the box with footswitch and all the rest, this loud attack cause a high pitch snap when I switch off the effect, especially after I waited 6-7 seconds the release time.
This snap is barely audible when I engage the Vemuram Jan Ray (in the same box).
I tried anyway to use a pulldown resistor input or output, but the problem is in that big boost of the compressor.

I really need help, the pedal is for a friend.


General Questions / Fear of the ground loop (Morley ABY MIX style)
« on: November 03, 2018, 06:28:25 AM »
Hello. I want to build a ABY looper for a friend. He wanted a Morley ABY Mix, but he would to do a thing that the Morley can't do, sometime to send both the input in one of the output, I guess I can do it.

But my fear is the ground loop that the looper can get using two amps. Also the original has this problem.
I didn't know it but this problem can be solved with an accessory, a sort of plug.

I wonder, what I can do to avoid this problem with this looper I'm going to build?


Hey, guys. I'm building a lot of stuff in these days. Some circuits are ok, but this is not!

I completed the board, though it has some sockets to test it :D
This is the layout:

This is the page:


Just one change: C15 from 47uF to 100uF (35v). The other electrolityc caps are 50v. Orientations are ok.
The ICs are the TL072 and 7660S CPAZ.
The clipping diodes are D9E. Every diodes are rightly oriented.
All the pots, the footswitch and the LED is wired.
Dual Gain pot like that:
1 2 3
4 5 6

The Footswitch is a 3PDT and is wired like that:
1 4 X
2 5 X
3 6 X

The circuit sounds, but extremely wrong. Buffered sounds low and crackling at the peak. Engaged the red turn on, the volume is still low, slightly overdriven, the volume pot works but the wide is really small, the Treble pot pretty the same, it's hard to say if it works, as the Gain pot, it crackle when I turn on.

These are the corrected voltages:
      IC1          IC2       IC3
1    +4.43V    +4.6V     +8.84V
2    +4.44V    +4.43V    +4.52V
3    +3.45V    +4.43V    0V
4    0V          -8.44V       -4.13V
5    +4.43V    +4.42V    -8.42V
6    +4.43V    +4.43V    +3.97V
7    +4.41V    +4.26V    +5.29V
8    +8.87V    +15.92V    +8.82V

And these are my voltages:
      IC1          IC2       IC3
1    +1.37V    +4.50V     +9.00V
2    +1.38V    +0.0V    +4.76V
3    +0.93V    +0.0V    0V
4    0V          -8.65V       -4.34V
5    +1.22V    +0.00V    -8.65V
6    +1.16V    +0.00V    +4.63V
7    +8.37V    +4.66V    +4.18V
8    +9.00V    +16.46V    +9.00V

Need some urgent help (and I never say urgent!).

Thanks! ;)

General Questions / Tight Metal huge volume
« on: October 02, 2018, 02:54:39 AM »
Hey, guys! :)

I'm building the Tight Metal on a verified veroboard layout I found. I'm testing the circuit, it works fine and sounds really good, but the volume is HUGE. I can't go over 2/10. It's really strange. Every schematic I found suggest a B10k Volume pot, but it's impossible use this normally.
The schematic is this:

The loop effect in my case are jumpered.
I can see the resistor to the ground near the output 47k in another schematic and 33k in Grind Custom FX's schematic.
I know the Tight Metal includes a 18v Charge Pump, too. But the layout I used doesn't have it. I'm gonna include it on a daughter board later.

Need some help, please.

Thanks! ;)

General Questions / Charge Pump: a bit of confusion
« on: September 12, 2018, 02:55:06 AM »
Hi, everybody!

I'm going to build the Amptweaker Tight Metal, but the layout I found doesn't have the charge pump, so I have to build a daugherboard.
I bought some ICL7660SCPA, I want to build something based on it.

I never used a charge pump, but I always thought the following veroboard layout was simple and good:

Of course, I compared it with some ICL7660S layout. Some of them include some extra parts like a 100uF and/or a 1N400X diode, as filter in the power supply. But the layout of the Tight Metal I have to use already has this accessories parts, and I guess I don't need of them.

And now my doubt about the circuit. I see in the charge pump layout that the pin 5 goes nowhere, so it's isolated. But in some other layout, as some schematic, pin 5 is connected (with the pin 3) to the ground. Why in this layout it isn't so?

Here's the schematic of the Tight Metal by Grind Customs with a charge pump section similar to the veroboard layout, except where pin 5 and pin 3 are connected together, and both go to the ground:

Should I consider to put a jumper to connect the ICL7660S pin 5 to the ground like the schematic?

General Questions / Who knows the real trick to get more bass? (RAT)
« on: September 03, 2018, 08:09:04 AM »
Hi! With my second Rat building I tried some tricks I read around here and there to get more bass from this pedal.

I tried with my first Rat the Ruetz mod with the pot control (replacing the R6 47R with a 1k Linear pot).
Now I tried to replace the C7 2.2uF with a 10uF. Then I back with the stock caps.
Then I replace the C6 4.7uF with a 10uF, and even the R7 560R with a 220R.
Nothing of that gets more bass, I got just a slightly dull sound, but this is not a Fat/Bass Boost mod I mean.
I guess it's very hard to get more bass from this circuit!

Who knows the real trick to get more bass?


General Questions / Phase 90: Matched 2N5952 or just any J201
« on: July 26, 2018, 04:57:13 AM »
Hey guys.
I built a MXR Phase 45 using not the 2N5952 transistors matched couple, but I tried two any J201 (when we get it easely!) and the effect worked fine immediately.

I would like to build the Phase 90, I don't want to buy a bunch of 2N5952 nor a matched transistors (a quartet) because the cost.
Now the J201 are not available in the shops I used to buy, so I decided to buy some SMD version, MMBFJ201, with the mini PCB.  I read those are exactly the same thing.
Did someone try to use just J201 in the Phase 90?


General Questions / What hell happend to this SD-1!
« on: June 15, 2018, 09:25:54 AM »
Did you see this?

I'm wondering if that is real or a joke.

General Questions / Looper True Bypass, not so easy like it seems
« on: May 25, 2018, 01:33:02 AM »
Hi, I'm looking some layout of the some DIY True Bypass Looper, one loope effects.
This is the basic schematic:

I found the Keeley one's gutshot:

It' includes a pair of extra resistors. ???
I'd say those resistors are between tip and sleeve of the jacks Send & Return. Pull Down Resistors, just in case we need of them?
Confirm, please?

And then I found some kits that includes a pair of caps (looking at the size I'd say 100nF). I can't imagine the purpose. :(

Help, please.

Thank you! ;)

General Questions / I want to learn the JFET, BJT adn IC voltages
« on: November 29, 2017, 03:56:48 AM »
Sometime, especially when I have to debug a circuit, I need to know the voltages of some parts as transistor or IC. But when I got the measurements, how I know if them are correct?
Is there a sort of guide, table or instruction?

Thanks for helping!

General Questions / Tonemender gain pot or very simple overdrive to add
« on: October 17, 2017, 10:14:55 AM »
Hi guys!
This is the thing. I have to put together the Tonemender with an high gain distortion. But I would like to have just a bit of overdrive, too. I wanted add a gain pot to the Tonemender. I replaced the resistor 4.7k with lower value, but the sound is still clean.
I hoped there was an easy way to get a bit of overdrive.

If that is impossible I could add a little overdrive board, but what? ::)
- It has to be little, simple, with just few components.
- Verified stripboard or protoboard.
- it can work at 12v.
- Just a gain pot which doesn't drop the volume at minimum setting.
- Transparent sound at minimum setting gain, as if it there's no.
- I can get a fix value for the volume with a trimmer.

I'm not saying that exist a pedal like that! ;D Just I wanna know if I can find it.

Thank you! ;)

General Questions / Bending Gauge Tool
« on: September 22, 2017, 07:57:17 AM »
Hey, guys!
I wanna ask you something about this tool:

It allows to bend the component's lead at the right size to fit on the perfored board.
Did someone try the Musikding's one? It is really useful with the stripboard, but just if it is really precise, else it will not useful at all.

Thanks! ;)

General Questions / Equalizer 5-band on veroboard too noisy
« on: March 02, 2017, 08:26:40 AM »
Hey guys! ;)
I built this circuit: and it works, but I got too hum in my opinion, almost like a high gain pedal. Indeed, I can't use it in the overdrive and high gain channels of my amp.
Here's the schematic and other information:
(The layout is not the exact copy of that project).

I'm checking the components again, but that seems ok.
Any suggestion?

Thanks! ;)

General Questions / Mini Amp, not so mini, and high gain
« on: July 03, 2016, 08:18:25 AM »
Hi guys. I built a Punch Amp, a Smokey Amp with gain control and some more features, and I'm planning to build a Noisy Cricket.

The Punch Amp is pretty clean, my Smokey Amp can be much aggressive and so will be the Noisy Cricket.
Now, I'm looking forward, and I want a mini amp for guitar, but not so mini, around 5w, with treble, middle and bass control, and of course gain and volume pots. I want to get a real high gain sound.

This is my idea:

Thanks for helping!

General Questions / Condor or...
« on: May 05, 2016, 08:25:53 AM »
Hi everyone.
I have to choice a cab sim. ROG Condor is one of most famous, built and well documented. It has some great mods, too. But someone seems to get a bit of overdrive in some cases. I'd like a cab sim clean, more than else. A "saturation" could be an optional, maybe, but not an issue.

I need some information about your experience with the Condor Cab Sim, and a possible alternative. One above other about the MultiCab Sim, it seems to be ok and versatile, too.

Thanks! ;)

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