Search found 361 matches

by Fender3D
17 Oct 2020, 13:11
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Boss - HM-2 Heavy Metal [schematic]
Replies: 298
Views: 175401

Re: Boss - HM-2 Heavy Metal [schematic]

Fender3D wrote: 16 Oct 2020, 09:13 Since this pedal has not the usual resistor + diode cell....
Sorry I was referring to HM3 schematic few post above...

Shorting the 2 wires you're actually bypassing R2 and D1, you can't hurt'em
by Fender3D
16 Oct 2020, 09:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Boss - HM-2 Heavy Metal [schematic]
Replies: 298
Views: 175401

Re: Boss - HM-2 Heavy Metal [schematic]

It seems to work fine driven on battery, but not with power connected. Since this pedal has not the usual resistor + diode cell, the only way to achieve this issue is having a broken DC connector, assuming you're connecting a correct power supply of course.... The goo in above pics is glue to keep ...
by Fender3D
09 Sep 2020, 10:41
Forum: Pedal Debugging & Troubleshooting Support
Topic: Maestro PS-1A (Help!)
Replies: 11
Views: 863

Re: Maestro PS-1A (Help!)

I don't know the exact power draw, but, as I said above, if you have 0.5W zeners on board, then that must be the max. power drawing (per rail).

I don't know either what's the smallest trafo available in stores, but one 2-3-5 W trafo will be enough.
by Fender3D
08 Sep 2020, 10:55
Forum: Pedal Debugging & Troubleshooting Support
Topic: Maestro PS-1A (Help!)
Replies: 11
Views: 863

Re: Maestro PS-1A (Help!)

I guess the 2 zeners eat more current than the 4 op-amps....
As a thumb rule... they're 0.5W zeners, you'll need 1W transformer in order to burn them off...
Anything in that ballpark will be ok
by Fender3D
07 Sep 2020, 08:05
Forum: Pedal Debugging & Troubleshooting Support
Topic: Maestro PS-1A (Help!)
Replies: 11
Views: 863

Re: Maestro PS-1A (Help!)

Welcome, if one transformer winding shows no resistance, then it's open... Replace it. I got this schematic phase shifter.png It does not have transformer voltages, but, it has 12V zeners, then you can safely get any dual sec. transformer with the same zener voltage, 2x12V if your phaser is the same...
by Fender3D
12 Aug 2020, 15:43
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Chorus 690 clock distorted output, not pulse
Replies: 15
Views: 643

Re: Chorus 690 clock distorted output, not pulse

That pulse waveform is correct for SAD512 since it has a clock divider which will provide the 2 out of phase clock signals internally.. It's the same waveform you'll find in MXR micro flanger or chorus of the same period. You might as well swap 4001 chip just in case, but I really think this is anot...
by Fender3D
04 Apr 2020, 02:08
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD FX65B gut picture and voltages
Replies: 13
Views: 1660

Re: DOD FX65B gut picture and voltages

It works for me....
it's an old site try https://hammer.ampage.org/ https://hammer.ampage.org/
BTW if you google Mark Hammer you'll find lots of interesting articles
by Fender3D
03 Apr 2020, 10:02
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD FX65B gut picture and voltages
Replies: 13
Views: 1660

Re: DOD FX65B gut picture and voltages

Mark Hammer @ https://archive.ampage.org/
read about chorus, flanger and analog echo here or @ DIYstompboxes
by Fender3D
02 Apr 2020, 18:23
Forum: DIY Stompbox designs
Topic: The complete BBD clock archive
Replies: 9
Views: 7443

Re: The complete BBD clock archive

DOD Chorus FX65B

Min clock 62.5KHz
Max clock 71KHz

Courtesy of hemisfeer
by Fender3D
02 Apr 2020, 18:18
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD FX65B gut picture and voltages
Replies: 13
Views: 1660

Re: DOD FX65B gut picture and voltages

Thanks for checking.
Values are in line with other choruses, width of delay is a tad small I thought it was somewhat larger, but that is
by Fender3D
01 Apr 2020, 17:07
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD FX65B gut picture and voltages
Replies: 13
Views: 1660

Re: DOD FX65B gut picture and voltages

DMM with Hz is fine,
just set speed at minimum and depth at max for a better reading.
by Fender3D
01 Apr 2020, 01:08
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD FX65B gut picture and voltages
Replies: 13
Views: 1660

Re: DOD FX65B gut picture and voltages

If you can, please check min and max clock at MN3007's pins 2 and 6.

Thanks for the picture.
by Fender3D
12 Mar 2020, 16:43
Forum: Pedal Debugging & Troubleshooting Support
Topic: TC Stereo Chorus/Flanger voltages
Replies: 6
Views: 646

Re: TC Stereo Chorus/Flanger voltages

...in order to troubleshoot need the IC voltages from a functioning unit. I think you'll need more than just voltages... this is not a project to do "by numbers". you'll need to know how THESE chips work, or need to work, since there are few regulation points and bias voltages usually come from the...
by Fender3D
12 Feb 2020, 14:23
Forum: Pedal Debugging & Troubleshooting Support
Topic: EH Deluxe Electric Mistress Repair [Help Identifying Mods]
Replies: 6
Views: 422

Re: EH Deluxe Electric Mistress Repair [Help Identifying Mod

I think you'd better check and trace yourself what mods have been made there, instead of wasting time looking for "tutorials" that any idiot with an iron think it's worth to do to a pedal... Ralf's site is gold: follow his schematic and write down the mods made. BTW EH used to tack parts on bottom P...
by Fender3D
15 Jan 2020, 15:31
Forum: Announcements and Forum Rules
Topic: FORUM UPGRADES DONE: Friday 8th MAY 2020 09.00 CET - Saturday 9th 13.00 CET
Replies: 45
Views: 9427

Re: 2020 forum updates - work in progress

Thanks for your efforts in keeping this web site alive and ass-kicking, Modman
by Fender3D
14 Nov 2019, 14:40
Forum: Pedal Debugging & Troubleshooting Support
Topic: Experimenting with OCD = weird result
Replies: 28
Views: 1164

Re: Experimenting with OCD = weird result

Any chance you have C6 shorted or leaking?
by Fender3D
16 Oct 2019, 14:56
Forum: Pedal Debugging & Troubleshooting Support
Topic: How to remove the popping noise when switching the reverb po
Replies: 4
Views: 291

Re: How to remove the popping noise when switching the rever

Long story short:
that switching will always make noise 'cause the vbias... biasing op-amp.

Either use series capacitors and a fixed bias resistor or use FETs to switch pots
by Fender3D
09 Oct 2019, 14:31
Forum: Pedal Debugging & Troubleshooting Support
Topic: MXR M-203 Stereo Flanger -> no modulation
Replies: 3
Views: 244

Re: MXR M-203 Stereo Flanger -> no modulation

Well... one of the trimmers is surely the bias control... it has only one correct setting...
the other trimmer might be feedback or clock, you should hear some change touching it!
by Fender3D
07 Oct 2019, 15:24
Forum: Pedal Debugging & Troubleshooting Support
Topic: MXR M-203 Stereo Flanger -> no modulation
Replies: 3
Views: 244

Re: MXR M-203 Stereo Flanger -> no modulation

Is there any clock on BBD's pin 1?

If you have it, you should check with signal probe if signal actually passes through BBD.
If I remember well, it should have a FET shorting signal to GND somewhere after BBD's output to "bypass" the effect.
by Fender3D
30 Jul 2019, 14:15
Forum: DIY Stompbox designs
Topic: BBD noise elimination
Replies: 6
Views: 1702

Re: BBD noise elimination

Filters' cutoff freq. MUST be lower than half the minimum clock freq.
In real world they'd better be lower than 1\3 clock freq.

They should be the same freq. also.

It's important not to feed too many high freq to BBD to reduce sampling errors, hence noise.