Search found 807 matches

by Duckman
04 Sep 2019, 01:36
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dean Markley - Overlord 1 Tube Drive - power transformer [schematic]
Replies: 25
Views: 3408

Re: Dean Markley - Overlord 1 Tube Drive - power transformer [schematic]

(José, maestrazo! Brava la cosa por ahí, no? Animo que han salido de peores!! :hug:) In fact, this particular unit has a 12AU7 but sadly, I don´t have a 12AX7 to make a personal test. Any way, the owner said that a pleasant change happened, kinda "clean the thing out", but... and correct m...
by Duckman
29 Aug 2019, 23:11
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dean Markley - Overlord 1 Tube Drive - power transformer [schematic]
Replies: 25
Views: 3408

Re: Dean Markley Overlord (tube) power transformer [schematic]

Today repairing another unit, spotted another minor error in that schemo: R14 = 24k, not 47k... sorry :slap:
by Duckman
09 Aug 2019, 04:26
Forum: Boutique Stompboxes dissected...
Topic: Fulltone - Supa-Trem
Replies: 72
Views: 26179

Re: Fulltone - Supa-Trem

So, this unit arrive today and I have some spare time to go deeper.
Any way, if somebody spots something funky, lemme kno' :hug:
by Duckman
23 Jul 2019, 09:20
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dean Markley - Overlord 1 Tube Drive - power transformer [schematic]
Replies: 25
Views: 3408

Re: Dean Markley Overlord (tube) power transformer [schematic]

I spotted a little mistake today: that point -V2 in between R23 and the (-) pin of C18 IT'S WRONG. Must be -V1. :slap:
by Duckman
11 Jul 2019, 23:19
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dean Markley - Overlord 1 Tube Drive - power transformer [schematic]
Replies: 25
Views: 3408

Re: Dean Markley Overlord (tube) power transformer [schematic]

Well, an old unit is in the bench right now, so I traced (the switch just give up) Is fully checked, but some values doesn't match with that old drawing we all know :shock: :D Take a look and if in doubt, I can make some clarifying pics. Rgds Pato Corrected schematic: http://www.freestompboxes.org/v...
by Duckman
19 May 2019, 04:06
Forum: Boutique Stompboxes dissected...
Topic: Keeley Katana 2014 [traced]
Replies: 3
Views: 1337

Re: Keeley Katana 2014 [traced]

Lemontheo wrote:Hi,
Nice schematic.
Have you got the drain voltages?
Thanks.
Théophile
Thanks, man :hug:

Sorry, it's gone, but I can borrow it and do the measures. Just give me some time, ok?
by Duckman
16 May 2019, 08:19
Forum: Boutique Stompboxes dissected...
Topic: Keeley Katana 2014 [traced]
Replies: 3
Views: 1337

Re: Keeley Katana 2014 [traced]

Well, a found a minor mistake: pot taper is wrong; it must be A250K, not B250K
Not the end of the world, but now is correct
Sorry
by Duckman
16 May 2019, 07:45
Forum: Boutique Stompboxes dissected...
Topic: Keeley Katana 2014 [traced]
Replies: 3
Views: 1337

Keeley Katana 2014 [traced]

This unit (#K8832) from 2014, is a little different from the rest I can found in the web.
In fact, some values are just weird... :scratch: so, I decided to trace it.
If there's any doubt, I can still provide pics for few days; after that, the unit goes back to the owner.
by Duckman
29 Mar 2018, 06:15
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS - Angry Charlie V3 (3 band eq) [traced]

Looks like this is the origin of that elusive tone section :mrgreen:
by Duckman
29 Mar 2018, 06:10
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS - Angry Charlie V3 (3 band eq) [traced]

bugg wrote:
marshmellow wrote:C10 should be at the junction of R8/R9, not at the opamp output.
I won't argue that it should be, but I'm fairly certain that it wasn't.
@marshmellow As long as C10 is in the Vref net, there's no big difference. Check the pics in page 1 of this thread. :thumbsup
by Duckman
17 Mar 2017, 09:14
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

:slap: Those two suckers must be added @ input:
R1: 1M to ground
C1: 22n in series with the 1k resistor R2 (same value as the MI audio Crunch Box, I guess... :roll: but you can try something else)
AChv3 Input.jpg
AChv3 Input.jpg (38.41 KiB) Viewed 2105 times
by Duckman
05 Jan 2017, 14:48
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

How soon is soon? :lol:
ANGRY CHARLIE TONE SECTION165.bmp
ANGRY CHARLIE TONE SECTION165.bmp (262.99 KiB) Viewed 3176 times
Now, we need to figure out some values :horsey:
by Duckman
05 Jan 2017, 14:27
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

Tinking with fresh head, there's nothing uber wrong with the tone control, just need to be rearranged in the schemo to clarify... soon. Thanks POTL :thumbsup
by Duckman
04 Jan 2017, 12:25
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

The LM833 section is a MI Audio Crunch Box :secret:
by Duckman
04 Jan 2017, 11:39
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

bro what program you drew this diagram ExpressPCB, bro :wink: I try to draw Charlie Brown traced scheme to test and try to help you Thanks, but that is a useless effort. CB has nothing to do here. :thumbsup With all respect, the hard work is done so if you want to help, put your eyes on those pictu...
by Duckman
04 Jan 2017, 02:25
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

I know... that's way I posted It... follow the traces and look if you can find any clue :thumbsup
by Duckman
03 Jan 2017, 22:27
Forum: Boutique Stompboxes dissected...
Topic: JHS - Angry Charlie V3 (3 band eq) [traced]
Replies: 43
Views: 21273

Re: JHS @ngry Ch@rlie V3(3 band eq) guts [traced]

I've been working a little :?
NOT VERIFIED YET... that Treble control :scratch: ... help? :oops:
by Duckman
18 Nov 2015, 05:54
Forum: DIY Stompbox designs
Topic: LM13700 based frequency variable distortion
Replies: 9
Views: 6092

Re: LM13700 based frequency variable distortion

MC-Sammer wrote:
Duckman wrote:
MC-Sammer wrote:feel free to take a look and offer suggestions!
MC-Sammer wrote:so if I can read it, it's good enough for me
Well, in that case, my suggestion is that you can fix it alone... and it's good enough for me :thumbsup
To be fair, I wasn't asking anyone to fix it for me :)
Fair enough
by Duckman
17 Nov 2015, 18:32
Forum: DIY Stompbox designs
Topic: LM13700 based frequency variable distortion
Replies: 9
Views: 6092

Re: LM13700 based frequency variable distortion

MC-Sammer wrote:feel free to take a look and offer suggestions!
MC-Sammer wrote:so if I can read it, it's good enough for me
Well, in that case, my suggestion is that you can fix it alone... and it's good enough for me :thumbsup