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by JiM
Yesterday, 17:41
Forum: Boutique Stompboxes dissected...
Topic: Darkglass Electronics - Microtubes B3K [traced]
Replies: 80
Views: 25969

Re: Darkglass Electronics - Microtubes B3K [traced]

No one is talking about a non-inverting 4049 here, there is no such thing. This is about buffered or not. One inverting CMOS cell would make a non-buffered inverter , e.g. found in a 4049UBE. Two inverting CMOS cells would make a non-inverting buffer , e.g. found in a 4050. Three inverting CMOS cell...
by JiM
10 Sep 2020, 20:29
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Behringer (not Harley Benton) Hell Babe
Replies: 1
Views: 470

Re: Harley Benton Hell Babe

Hmmm, definitely not Harley Benton, but Behringer. And that schematic comes from here. And it was drawn by me . The hex inverters are used for driving the LEDs that are used by the opto circuit (in parallel for higher current), and to invert the control signal to the bypass JFETs. An adjustable RC f...
by JiM
31 Jul 2020, 06:51
Forum: Modern Stompbox Effects (1975 - ...)
Topic: EH pulsar tremolo,why 78l09?
Replies: 10
Views: 573

Re: EH pulsar tremolo,why 78l09?

Their main power supply puts out 9.6V :
https://shop.ehx.com/item/eu9.6dc-200/g ... es-europe/
(there are others 9.0V, but with a minijack connector for older BigMuffs)

Maybe this is a way to "encourage" customers to buy their power supplies instead of a generic one.
by JiM
29 Jul 2020, 07:03
Forum: DIY Stompbox designs
Topic: A Phaser Unit
Replies: 3
Views: 448

Re: A Phaser Unit

[smilie=a_holycrap.gif] OMG, why? It must have taken ages to copy this info in Excel. Please make yourself a favor, and use CAD software to draw schematics. Many are free. Or even simpler, give a direct link: https://worldradiohistory.com/UK/Practical-Electronics/70s/Practical-Electronics-1979-04-S-...
by JiM
28 Jul 2020, 15:18
Forum: Pimp-My-Cheap-Pedal
Topic: Behringer VM1 Vintage Time Machine
Replies: 109
Views: 61212

Re: Behringer VM1 Vintage Time Machine

Do I lose the led indication in the process, as was mentioned in the post you linked? Yes, the wiring i've devised yesterday is indeed identical to the previous post. It's only logical. X7 pin 1 to effect send, Nope, this is the output of the effect. X7 pin 2 to output, That would work. X7 pin 3 to...
by JiM
27 Jul 2020, 10:34
Forum: Pimp-My-Cheap-Pedal
Topic: Behringer VM1 Vintage Time Machine
Replies: 109
Views: 61212

Re: Behringer VM1 Vintage Time Machine

It's just a matter of re-wiring the connectors between the jacks PCB and the footswitch PCB. Referring to the schematic above : - disconnect X6 pin 1 and X7 pins 3, 4 and 5 : this disconnects the tone-sucking input and the LED control. - connect X8 pin 1 to X1 pins 3 and 4 : this connects the input ...
by JiM
27 Jul 2020, 09:58
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Joyo - JF-13 AC Tone [schematic]
Replies: 71
Views: 82691

Re: Joyo - JF-13 AC Tone [schematic]

I was wondering about the addition of FX loop to the pedal, so that the pedals in the loop are placed after the preamp section rather than just placing them after the cab sim(as in after the entire pedal without a loop built in). This would then put the EQ after the loop as well, i'm not sure this ...
by JiM
27 Jul 2020, 09:39
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 14
Views: 1864

Re: Circuit for a Blackstar Fly 3 watt amp?

Good job in finding the part ! :applause:
by JiM
21 Jul 2020, 15:05
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1437

Re: Reduce Wiring Noise: Avoid Magnets

It would act exactly as the coil wire : unshielded wire bathed in the magnetic field of the pickup. The baseplate is usually non-magnetic (with the notable exception of many Telecaster bridge pickups), so the mangnetic field passes through. Simplified view : https://cdn.mos.cms.futurecdn.net/29cvYv6...
by JiM
21 Jul 2020, 14:09
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1437

Re: Reduce Wiring Noise: Avoid Magnets

Its lead wires are unshielded. Yep, that would be the main culprit. Afaik, the pickup works with alternating magnetic filed, that is created by string vibration - string is made of a metal with magnetic properties, magnetic field is induced into it through pickup poles, when the string is moving, t...
by JiM
13 Jul 2020, 13:28
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 14
Views: 1864

Re: Circuit for a Blackstar Fly 3 watt amp?

I'll try to get hold of the Blackstar extension speaker (FLY103) cabinet for this amp and open that up to see if it also has an amp. One quick way to check this possibility is to trace the signals going to the extension connector. Most probably there are the same four as the ribbon going to the amp...
by JiM
08 Jul 2020, 15:45
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Darkglass - Tone Capsule
Replies: 20
Views: 1975

Re: Darkglass - Tone Capsule

I don't know why R20 is connected in that way. I would expect this kind of filter topology : https://www.petervis.com/record_players_and_turntables/baxandall/baxandall-circuit-design/baxandall-circuit-design.gif with both R at the top being R19 and R20, and the treble pot being replaced by R1 and R2.
by JiM
07 Jul 2020, 06:03
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Harley Benton - American Sound
Replies: 1
Views: 358

Re: Harley Benton - American Sound

Thanks ! In the comparison table, some values were still a bit uncertain for this pedal :
viewtopic.php?p=237567#p237567
by JiM
07 Jul 2020, 05:54
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Darkglass - Tone Capsule
Replies: 20
Views: 1975

Re: Darkglass - Tone Capsule

At first glance the schematics looks logical, good work ! I'll check in more details later. Next step is to populate some values ... Resistors should be easy, your pictures are detailed enough to read directly. Some resistor use this code : http://www.resistorguide.com/resistor-smd-code/#The_EIA-96_...
by JiM
22 Jun 2020, 12:45
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Joyo - JF-13 AC Tone [schematic]
Replies: 71
Views: 82691

Re: Joyo - JF-13 AC Tone [schematic]

Given that the bode plots of the other three are identical without the cab sim, I'd say they must be wrong too, unless the assertion is that the cab is the only thing that sets those amps apart in real life. Most changes are in EQ frequencies, so when set flat there will not be much difference in s...
by JiM
19 Jun 2020, 08:47
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Joyo - JF-13 AC Tone [schematic]
Replies: 71
Views: 82691

Re: Joyo - JF-13 AC Tone [schematic]

By reading the big "Character Series" thread, all the schematics and comparisons between models from Tech21 and Joyo are there :
viewtopic.php?f=1&t=6571&hilit=characte ... =80#p71872
by JiM
14 Jun 2020, 22:38
Forum: Modern Stompbox Effects (1975 - ...)
Topic: T-Rex - Hobo Drive [schematic]
Replies: 12
Views: 1474

Re: T-Rex Hobo Drive [schematic]

hemisfeer wrote: 12 Jun 2020, 13:39If anyone is interested, I can post the schematic.
Please!
by JiM
12 May 2020, 18:10
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Behringer - TP300 Ultra Tremolo Pan
Replies: 1
Views: 945

Re: Behringer - TP300 Ultra Tremolo Pan

Hey ! It's been a long time ... I happen to have that pedal (works great with a stereo amp or with keayboards), so here are some gutshots. It's based on a pair of CoolAudio V2159 VCAs, that seem discontinued. There are also a few opamps (4558, TL06x) and quite a number of transistors as well. It's f...
by JiM
16 Jun 2019, 11:08
Forum: Electric Guitar Rewiring
Topic: HSS tele project
Replies: 7
Views: 6566

Re: Trick Tele wiring for HSS

JiM wrote:You could also have a look at my "Nashville Serial Killer", intended to add series combinations to a Nashville Telecaster.
It seems that TDPRI has changed their image URLs. There it is :

Image
by JiM
02 Mar 2019, 18:41
Forum: Pimp-My-Cheap-Pedal
Topic: Behringer VM1 Vintage Time Machine
Replies: 109
Views: 61212

Re: Behringer VM1 Vintage Time Machine

Thanks a lot, j_flanders ! That's amazing work in analysis, error-finding and circuit improvement. :applause: I'm proud that 10 years later, this thread still exists and finds some use. Replacing the 22k with a 100k pot and the 100n with a switch to various caps, really lets you shape the repeats bo...