Search found 309 matches

by Ichabod_Crane
18 Mar 2024, 14:35
Forum: Boutique Stompboxes dissected...
Topic: Ts808 Tamura mod
Replies: 9
Views: 1060

Re: Ts808 Tamura mod

Thanks karul.
Change R127 is weird. That is on the switching part. Why change it?
by Ichabod_Crane
17 Mar 2024, 09:40
Forum: Boutique Stompboxes dissected...
Topic: Ts808 Tamura mod
Replies: 9
Views: 1060

Re: Ts808 Tamura mod

The number of the parts is base on which schematic?
PCB shows different names (R132, C106...)
by Ichabod_Crane
08 Feb 2024, 08:46
Forum: DIY Projects
Topic: Clear Solid State Blackface Preamp
Replies: 3
Views: 1563

Re: Clear Solid State Blackface Preamp

Sorry, I forgot and I missed this thread. Here's some layouts version of mine. Not verified , never build it nor tried on breadboard. I checked it when I did the layout and it could be fine. Maybe there's some minor error in the notes, and I advice to see the schematic, too. I drawn it for me, so if...
by Ichabod_Crane
21 Jan 2024, 09:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Voodoo Labs - Tremolo [schematic]
Replies: 17
Views: 8910

Re: Voodoo Labs - Tremolo [schematic]

Thanks for the schematic.
Let see if I got everything. That H11F3 is about the bypass switching? Can we ignore it in case of true bypass version?
Then I see, in the old version picture, two knobs I guess, that has a PULSE / SWELL... switch or something?
by Ichabod_Crane
09 Dec 2023, 16:26
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Diamond Fireburst [schematic]
Replies: 4
Views: 2960

Diamond Fireburst [schematic]

Hello, I watched some video of this Fuzz/Distortion pedal, and I am very curious about it. But I cannot find any gutshot pictures, nor any clue about schematic. I just imagine the bass-treble eq is a baxandall type, but nothing else. https://i.imgur.com/ECKDomS.png https://www.youtube.com/watch?v=0k...
by Ichabod_Crane
02 Dec 2023, 10:33
Forum: DIY Projects
Topic: Tetrafuzz
Replies: 7
Views: 3287

Re: Tetrafuzz

What's difference you can hear with mosfet instead BJT transistor?
by Ichabod_Crane
02 Dec 2023, 10:12
Forum: Boutique Stompboxes dissected...
Topic: Xotic - SL Drive
Replies: 15
Views: 6206

Re: Xotic - SL Drive

I think that 125B boxes in these period are a bit harder to find and more expensive.
Those are bigger than 1590B, but maybe is convenient to have the input and output in the upper side.
by Ichabod_Crane
26 Nov 2023, 08:54
Forum: Boutique Stompboxes dissected...
Topic: Xotic - SL Drive
Replies: 15
Views: 6206

Re: Xotic - SL Drive

You're talking about R19, a resistor that seems missing in the Aion tracing. Maybe there are different edition of this pedal? That resistor could explain a different value for C11 capacitor. While, C12 and R18 placed before the Tone pot change drastically the Tone pot action, I guess, and it will wo...
by Ichabod_Crane
23 Nov 2023, 08:38
Forum: DIY Projects
Topic: Clear Solid State Blackface Preamp
Replies: 3
Views: 1563

Re: Clear Solid State Blackface Preamp

I tried to draw it, too. (Not verified.)
If you want I can post it here later.
by Ichabod_Crane
06 Nov 2023, 08:07
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Mooer - Grey Faze / Tomsline - G-fuzz
Replies: 9
Views: 2782

Re: Mooer - Grey Faze / Tomsline - G-fuzz

Thanks.
And is FB2 ferrite? Is that what drop the voltage?
by Ichabod_Crane
05 Nov 2023, 09:38
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Mooer - Grey Faze / Tomsline - G-fuzz
Replies: 9
Views: 2782

Re: Mooer - Grey Faze / Tomsline - G-fuzz

All that power supply circuit, the 1044... to get 7.0v?
by Ichabod_Crane
04 Nov 2023, 08:19
Forum: DIY Projects
Topic: Stupidly Awesome Buffer [documentation]
Replies: 64
Views: 42637

Re: Stupidly Awesome Buffer [documentation]

Pin 8... I was too tired!
by Ichabod_Crane
03 Nov 2023, 10:06
Forum: DIY Projects
Topic: Stupidly Awesome Buffer [documentation]
Replies: 64
Views: 42637

Re: Stupidly Awesome Buffer [documentation]

Thanks! I think I never tried a wiring with also output grounded. But I have another question, now: "connect pin 1 and p8 with a 47R resistor"? (I guess that pin 1 can't be any except the first in the left top and pin 8 can't be any except the last in the right bottom). This means that the...
by Ichabod_Crane
29 Oct 2023, 09:08
Forum: DIY Projects
Topic: Stupidly Awesome Buffer [documentation]
Replies: 64
Views: 42637

Re: Stupidly Awesome Buffer [documentation]

I noticed that in your schematic the pulldown resistor is absent.

Do you have a drawn of your alternative "true bypass" wiring without pulldown resistor?
It's a bit off topic, so just you want to do it.
by Ichabod_Crane
28 Oct 2023, 08:29
Forum: DIY Projects
Topic: Stupidly Awesome Buffer [documentation]
Replies: 64
Views: 42637

Re: Stupidly Awesome Buffer [documentation]

And I ask about this last schematic, please: none pulldown input resistor? What is the input impedance?
by Ichabod_Crane
16 Oct 2023, 09:38
Forum: Modern Stompbox Effects (1975 - ...)
Topic: PAL Fx JCM 800 Emulator [schematic]
Replies: 73
Views: 66016

Re: PAL Fx JCM 800 Emulator [schematic]

I solved it.
None error, but it was something weird about external disturbs and interference.
I changed a bit the wiring isolating the gain tracks , and now it seems work normally. I have to try it again, but it should be ok.
by Ichabod_Crane
12 Oct 2023, 08:42
Forum: Modern Stompbox Effects (1975 - ...)
Topic: PAL Fx JCM 800 Emulator [schematic]
Replies: 73
Views: 66016

Re: PAL Fx JCM 800 Emulator [schematic]

Hello. The source resistor for Q2 is 10K, and it's correct following the PAL800 schematic and the other JFET emulator, beacuse both come from the original JCM800 schematic. I guess I heard about replace Q4 with a 2N5458, but I think that's not a big issue. I know Dr. Boogie has a scaled tonestack, I...
by Ichabod_Crane
11 Oct 2023, 07:59
Forum: Modern Stompbox Effects (1975 - ...)
Topic: PAL Fx JCM 800 Emulator [schematic]
Replies: 73
Views: 66016

Re: PAL Fx JCM 800 Emulator [schematic]

I'm sure that should work, but I checked a lot of time, every single part, replaced suspect ones, resoldered, measured, continuity... Thanks for the tip about the biasing, but, until the Mid mess up the voltage I can't do anything. Why you say "the problem is in the transistor"? Do you thi...
by Ichabod_Crane
10 Oct 2023, 10:22
Forum: Modern Stompbox Effects (1975 - ...)
Topic: PAL Fx JCM 800 Emulator [schematic]
Replies: 73
Views: 66016

Re: PAL Fx JCM 800 Emulator [schematic]

I think I had a similar problem with one of my jfet emus a few years ago, but I ended up binning it instead of debugging. I'd try to put a 1uF cap between the jfet follower and the tonestack, and see if it changes anything. Meanwhile, I tried it, but nothing changed. I replaced even the coupling 22...
by Ichabod_Crane
09 Oct 2023, 17:46
Forum: Modern Stompbox Effects (1975 - ...)
Topic: PAL Fx JCM 800 Emulator [schematic]
Replies: 73
Views: 66016

Re: PAL Fx JCM 800 Emulator [schematic]

I still need help.
I can't bias the transistors, because gain and mid seems interactive with the bias of some transistors. And I got sputtering sound around half gain setting.