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Messages - JackSkellington

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Why two high gain circuits in a box? :P How do they sound?

How Do I? Beginner's Paradise. / Re: The "Multi" Rat and the switches
« on: September 14, 2019, 09:21:44 AM »
Hi guys!
I built this Multi Rat a pair of time.
I want to build this again, but in a 1590B enclosure (or 125B at max), using a toggle  3-way switch DPDT with Z connection for three clipping and the stock three pots, without any Ruetz mod with extra toggle switch or pot.
I want save some room inside the box, and I ask if I have necessary to use the IRF520 mosfet or I can use the normal size BS170. Reading the datasheet or the specification I can't say if that is a good replacement with no difference.

I read the Fat Rat use BS170 with a pair 1N270 (the layout says 1N34A), or the BS170 with BATxx. But I have no proof.
Who knows what mosfet use the original Fat Rat? Does someone find some picture?

Thanks! :)

General Questions / Re: Sometime circuits squeal, sometime not
« on: September 14, 2019, 03:48:29 AM »
I don't know about the PSU, having another one is not a bad idea overall, but I'm not sure the main problem is the PSU, the SHO on the Box of Rock board work fine, replicate the power filter doesn't work. I have to say tha my SHO board have a mod, I took off the 100k to the ground and add a Volume output. But the whine doesn't seems depend from the volume output. And it change the pitch acting on the gain pot. Someone got the same issue, reading the Guitar FX tagboard page of the SHO: (But it was a cap problem.)

I didn't find any layout that is an exact version of the one I chosen, even if sometime is enough change the value of a pair of resistor and the kind of the diode.  But I would like to try with another one small layout.

General Questions / Re: Sometime circuits squeal, sometime not
« on: September 13, 2019, 03:00:57 AM »
I'm beginning to doubt about everything: PSU, my home, my capacitors...

Actually, I told yet but, when I built the circuits of Woolly Mammoth and the Pharaoh Fuzz those was initialli ok, then the Woolly squealed suddenly, then I thought I fixed it with a 47R resistor in line to the 9v, but I tried to jumper it to see the difference and that was ok! So I left the resistor out, but later, one or two days later, it squealed again, and no resistors, diodes or bigger filter caps fixed that.
At the same time Pharaoh Fuzz circuit, that was ok, started to squeal, but a 47R fixed it.
Another thing: after I rewired a Washburn guitar of a friends, this Washburn hums, while my guitars are ok. So my friend brought it from a professional technic, and it was noiseless.

I have to try to test my circuit in another room, but I'm not so optimistic.

But... if I use a resistor in line (I see the original schematic of the SHO released by Zvex with a 100R), a 47uF cap across the ground is already there, can't we be really really sure that is impossible to get this whine? This whine shouldn't be! (Of course if we have a good PSU as I assume is my Boss).

Update: Do you know when people says "it seems to be in the Twilight Zone"? I built in these days a Box Of Rock (three sho in cascade + another one indipendent in the end of the circuit.) and I tested it today. The distortion side works fine, and the SHO stand alone works fine without any whine/squeal. I tried immediately my SHO board, but it squeals. The only schematic difference between the two SHO is a 1N5817 + 82R in line to the 9v and a 100uF instead of a 47uF across the ground. But I did some test with diode and resistor, even in series, without success.
It could be the layout? :o

General Questions / Re: Sometime circuits squeal, sometime not
« on: September 12, 2019, 01:46:12 AM »
Spare PSU's are useful in any case.

Any photos?

I bought maybe three years ago material to build a 9v PSU, but I never built it, I will not talk about it right now, maybe next time! :)

Alanp, what photos you want? My PSU or the circuit?

General Questions / Re: Sometime circuits squeal, sometime not
« on: September 11, 2019, 05:02:38 AM »
The PSU is an old Boss, I always find it good, and I never had problem. This is really weird, because my old pedals, I tried some just today, don't have this problem.
My last two circuits I can't fix, Woolly Mammoth and SHO, have both an electrolytic cap in the power filter, and nothing I can put in line to the 9v can tame the whine.

The SHO is not high gain, it's pretty clean at medium setting, but it squeals anyway. I wanted put it in a 1590A enclosure, I'm using 9mm pots (I add the volume, too), and I can't put a buffer in front, I have not much space. As I don't want put a buffer in front of a Woolly Mammoth, because it is a fuzz.

General Questions / Re: Sometime circuits squeal, sometime not
« on: September 10, 2019, 11:07:59 AM »
Probably I'll make another attempt with the Woolly Mammoth on bradboard, or make it again.
Meanwhile, I built a SHO using this layout: and guess what? It squeals with the PSU! ;D (Of course, that it's ok with battery.)
My last four circuits had the squeal. Echoplex Preamp, but I solved with a diode in line to the 9v; the Pharaoh Fuzz, and I solved with a 47R. No way to solve the problem with the Woolly Mammoth, and now I built this SHO, and I tried to put in line to the 9v 47R, 100R, 330R! And then 1N4001, 1N4007, 1N5817 and nothing. A 100nF film across the ground, extra electrolytic caps and nothing.
What's going on?

Open Discussion / Re: What's this? What's this?
« on: September 04, 2019, 12:41:56 AM »
Is this something about me? ;D

General Questions / Re: Small Good Distortion in 1590A box
« on: August 26, 2019, 12:37:36 AM »
I use Tina TI. I learnt to use it in a few of days.
Sometime it is very useful to make some test before to try the real board. Though in certain circuit, especially fuzz, I got weird responses of the frequencies.

Build Reports / Re: Benzin VH4- Get your chug on!
« on: August 16, 2019, 07:52:18 AM »
I't a feature of the original pedal. It's a the output that you can connect the pedal directly in the return of the amp.
It's a project I wanna try, but I use build pedal with the stripboard. There's the tagboard layout, but someone got some issue. This distortion is prone to the oscillating.

Build Reports / Re: eqd tentacle
« on: August 11, 2019, 12:59:15 AM »
Yes, it's an octave up. It's not a OctaFuzz or something Jimi Hendrix style, but is not really really clean.

Build Reports / Re: eqd tentacle
« on: August 10, 2019, 10:25:28 AM »
Nice, neat and clean! 8)

I build it on veroboard, layout from tagboard. Comparing the schematic in the document build from PedalPCB of this pedal with other schematics I found (Tentacle and Green Ringer) I noticed a difference: the output resistor across the ground is 10k and not 47k.
My Tentacle pedal works great about the ringing and the octave up effect, it sounds little fuzzy. I think it sounds how it should. In my there's a little volume boost.
How does work your Tentacle pedal?

I was going to ask about the volume knob, but I didn't! ;D I guess, indeed, that the volume pot change the sound of our pedals, at least bit. The volume master in the pedals is not so linear how someone could think. Generally, the volume pot at low setting adds resistance between circuit and output and get no resistance at max setting.

In case it could be still useful, in my thread here vasilis suggest something about his Acapulco Gold. ;)

Good suggestion Jack. Will do that after I try and connect a bmp tone stack in the circuit and see if it changes the tone.  Only problem is if I make tonestack on vero, I'm afraid it won't fit the 1590a or could be a tight squeeze.
Yes, a bmp tone stack needs a bit of space, indeed I suggested just a simple RC low pass filter, like you can see here:

Actually, I'm trying to do the same thing on another LM386 based circuit. :D

If you have some doubts about the sound of your circuit try to check it, in case there's something wrong.

Maybe a low pass filter at the end of the circuit?

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