Search found 119 matches

by jhergonz
13 Mar 2024, 07:05
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Mesa Boogie - Throttle Box [schematic]
Replies: 94
Views: 112888

Re: Mesa Boogie - Throttle Box [schematic]

I built this modified version of Mesa Boogie Throttle box. The difference with the original is that, this is inductor less, and the EQ switch is external. Info can be found in this thread. Maybe next time, I'll try changing the tone control into BMP style tone control circuit to control the Fatness....
by jhergonz
05 Aug 2023, 08:27
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Mxr Carbon Copy
Replies: 28
Views: 24999

Re: Mxr Carbon Copy

kanengomibako wrote: 04 Aug 2023, 05:06 I reported tracing Carbon Copy on X(Twitter). Here is the schematic.

KiCad7 Data
https://github.com/kanengomibako/CarbonCopy
at last! Thank you very much.
by jhergonz
21 Feb 2023, 11:59
Forum: Boutique Stompboxes dissected...
Topic: Darkglass - Duality Fuzz Engine [traced]
Replies: 27
Views: 9947

Re: Darkglass - Duality Fuzz Engine [traced]

All right, y'all were patient - here's the full schematic. darkglass-duality-trace-schematic.png I believe the most recent schematic from this thread is accurate other than the missing capacitor values. The only structural difference is R11 in my schematic, which was not present in the unit I trace...
by jhergonz
17 Jan 2023, 04:05
Forum: Boutique Stompboxes dissected...
Topic: DSM & Humboldt Simplifier
Replies: 20
Views: 4379

Re: DSM & Humboldt Simplifier

Oloorin wrote: 15 Jan 2023, 22:47 Have you traced what does the "spread" switch do?
I think it is PHASE switch.
by jhergonz
17 Dec 2022, 14:35
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Caline CP-29 White Heat [schematic]
Replies: 31
Views: 8741

Re: Caline CP-29 White Heat [schematic]

wow! i learned so much in this thread. Thanks guys.
by jhergonz
09 Dec 2022, 14:24
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4 [traced]
Replies: 45
Views: 14688

Re: JHS Morning Glory V4 [traced]

This is what I noticed, there is no resistor between the output of the opamp and the clipping diodes(LED). I put 1k resistor then the problem disappears. Maybe that is the reason why in the V4's version 1.5, there is a 10k resistor between the opamp's output and the LEDs. Thanks a LOT ! FINALLY ! I...
by jhergonz
18 Nov 2022, 04:35
Forum: DIY Projects
Topic: Caballero cab sim [documentation]
Replies: 27
Views: 28387

Re: Caballero cab sim [documentation]

update, I simulate the gyrator using 2N3904, and the response changed. I should stick with TL072. but I also change the Sealed/Open switch with a potentiometer. Maybe I will call it Cab size? I still don't know. Once I tested it, I will record a short demo and share the schematics here. Of course i...
by jhergonz
18 Nov 2022, 04:30
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Solar CHUG
Replies: 2
Views: 607

Solar CHUG

Just gonna leave this here. Photos not mine.
by jhergonz
16 Nov 2022, 05:58
Forum: DIY Projects
Topic: Caballero cab sim [documentation]
Replies: 27
Views: 28387

Re: Caballero cab sim [documentation]

update, I simulate the gyrator using 2N3904, and the response changed. I should stick with TL072.

but I also change the Sealed/Open switch with a potentiometer. Maybe I will call it Cab size? I still don't know.


Once I tested it, I will record a short demo and share the schematics here.
by jhergonz
14 Nov 2022, 14:31
Forum: DIY Projects
Topic: Caballero cab sim [documentation]
Replies: 27
Views: 28387

Re: Caballero cab sim [documentation]

it is fine to use transistors for the gyrators, right? It's possible, but the higher output impedance of an emitter follower will affect the frequency response when the series resistance required is low, if you don't account for it. I'd simulate both filters and decrease the series 470R resistor to...
by jhergonz
13 Nov 2022, 10:39
Forum: DIY Projects
Topic: Caballero cab sim [documentation]
Replies: 27
Views: 28387

Re: Caballero cab sim [documentation]

it is fine to use transistors for the gyrators, right?
by jhergonz
22 Oct 2022, 19:52
Forum: DIY Projects
Topic: PUP: a host of Perfectly Usable Phasers [documentation]
Replies: 54
Views: 6841

Re: PUP: a host of Perfectly Usable Phasers [documentation] [documentation]

Nice! No sorting of JFets and no pricey OTA. Will definitely try this.
by jhergonz
19 Oct 2022, 19:26
Forum: DIY Projects
Topic: Caballero cab sim [documentation]
Replies: 27
Views: 28387

Re: Caballero cab sim [documentation]

Thank you for sharing. Great timing, because I'm looking for a nice sounding simple cabsim circuit. I will definitely build this ASAP before I build an stereo version of Omni cab. Ofcourse that headphone output will be a great add on. and I think Aux input with also be a great additional feature, wi...
by jhergonz
18 Oct 2022, 06:40
Forum: Boutique Stompboxes dissected...
Topic: JHS Morning Glory V4 [traced]
Replies: 45
Views: 14688

Re: JHS Morning Glory V4 [traced]

Just finished building the first schematics of Morning Glory v4 with some changes, Wow, that's cool, which schem did you base your mods on ? I compared the two V4, but my v4 is REALLY noisy (like synth fuzz noisy) when I turn the knobs up in the red mode so... The V4 rev 1.5 is dead silent on compa...
by jhergonz
15 Oct 2022, 21:24
Forum: Boutique Stompboxes dissected...
Topic: Fortin Zuul [traced]
Replies: 46
Views: 21167

Re: Fortin Zuul [traced]

Just gonna leave this here.
by jhergonz
05 Oct 2022, 19:57
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Tom Scholz's Rockman Compressor with two release time constants
Replies: 9
Views: 1571

Re: Tom Scholz's Rockman Compressor with two release time constants

bmxguitarsbmx wrote: 05 Oct 2022, 19:30
jhergonz wrote: 05 Oct 2022, 15:39 thank you for sharing this. but can you share the images again? I think they're broken.
I can see them. Try your pop up settings?
can see it now. Thank you.
by jhergonz
05 Oct 2022, 15:39
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Tom Scholz's Rockman Compressor with two release time constants
Replies: 9
Views: 1571

Re: Tom Scholz's Rockman Compressor with two release time constants

thank you for sharing this. but can you share the images again? I think they're broken.
by jhergonz
31 Aug 2022, 17:15
Forum: Boutique Stompboxes dissected...
Topic: Seymour Duncan - SFX-04 Twin Tube Mayhem [traced]
Replies: 15
Views: 2311

Re: Seymour Duncan SFX-04 Twin Tube Mayhem [traced]

I made a rough math, R41 should be about 100kOhms and not 5.6kOhms. I revised the schematic regarding the visibility. I did not change the component values, that has time until all values are confirmed. Seymour Duncan SFX-04 Twin Tube Mayhem SW.jpg C30 in mid control should be equal to 3.9nF. This ...
by jhergonz
31 Aug 2022, 17:13
Forum: Boutique Stompboxes dissected...
Topic: Seymour Duncan - SFX-04 Twin Tube Mayhem [traced]
Replies: 15
Views: 2311

Re: Seymour Duncan SFX-04 Twin Tube Mayhem [traced]

I measured it with my multi meter, it is somewhere around 230v, not exact but close.

I already sent the unit to the owner, so I can't measure it again.

But I didn't measure the resistor value with my multimeter, I just read the resistors' band.

I maybe wrong.
by jhergonz
28 Aug 2022, 17:58
Forum: Boutique Stompboxes dissected...
Topic: Seymour Duncan - SFX-04 Twin Tube Mayhem [traced]
Replies: 15
Views: 2311

Re: Seymour Duncan SFX-04 Twin Tube Mayhem [traced]

I made a rough math, R41 should be about 100kOhms and not 5.6kOhms. I revised the schematic regarding the visibility. I did not change the component values, that has time until all values are confirmed. Seymour Duncan SFX-04 Twin Tube Mayhem SW.jpg C30 in mid control should be equal to 3.9nF. This ...