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Topics - JackSkellington

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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! ;)

How Do I? Beginner's Paradise. / The "Multi" Rat and the switches
« on: March 01, 2016, 05:57:25 AM »
Hi guys.
One of my next projects is The Rat, a kind of multi rat version.
I chose this:

So, that should be a sort of three version in one, cause the several clipping.
I wanted to use for the first time a rotary switch and I bought this 2P6T:

I bought it for a more complex version, but then I change my mind for an easier version, in the first link.

My question:
1. Can I use a 2P6T rotary switch in that layout? I was thinking to use the three clipping modes and a fourth position for a no clipping mode.
2. I would like to know if that rotary switch has the chance to set only four positions. (I wish because it will be Very useful.)

Thank you!

How Do I? Beginner's Paradise. / Wiring for a fuzz factory on verboard
« on: February 18, 2016, 11:28:24 AM »
Hi guys.
Unfortunately I need some help, again.
I built a Fuzz Factory circuit using the veroboard layout of tagboard:

I tested it, and it seems work well, except for a detail.
If I put all the ground, the negative from the DC jack, the ground wire from the board, and the two ground wires from the volume and gate pot all together on the input sleeve I can't set the drive pot at max, because I got much noise, and I even can't set to zero the volume and the tone pot of my guitar because the noise become a squeal.
I can solve this issue if I separe the two ground from the pots from the other ground and connect them on the sleeve of the output.
Anyway, also in this case I got a sort of noisy squealing whistle.

For having no noise I have slightly low the drive.

I don't know why this happends. I would build this circuit perfectly.

I'm using the madbeanpedals wiring, and just the grounds are not soldered.

Thank you!

General Questions / Rub-a-Dub Reverb Deluxe in feedback
« on: February 05, 2016, 09:18:02 AM »
Hello guys!
My first post here.
I play guitar and I learnt to build pedals, but I'm just moderated expert.

I built a Rub-a-Dub Reverb Deluxe on veroboard. I'm testing it and it seems to sound good. I tried the "only wet signal mod" taking off the 22k resistor, and also this works well.

I have just a problem. I can't set the dual pot over the half.
1776 board has a 100k Linear dual pot, but the layout I found has a 250k dual pot, it should allow longer decay. But if I set the decay pot over the half, after a while I got a sort of feedback effect, like with some high gain distortion, but clean, then it gets dirtier and pretty louder. The only way to kill it is turn the decay pot to min.
I power it with battery.

Is the dual pot too much big the problem?

Thank you!

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