Search found 47 matches

by John G
08 Apr 2020, 23:41
Forum: Boutique Stompboxes dissected...
Topic: Mad Professor - Simble [traced]
Replies: 55
Views: 23433

Re: Mad Professor - Simble [traced]

Bugg, I mailed you from this board.....maybe I should of PMd you. Any who you have it now, and yes!!!!! no doubt it has mistakes, I look forward to your completed schemo. Attached is a shootout of the the pedal I had being compared to the OCD. Cheers John https://www.youtube.com/watch?v=MO0T85Kb5Tc
by John G
07 Apr 2020, 23:32
Forum: Boutique Stompboxes dissected...
Topic: Mad Professor - Simble [traced]
Replies: 55
Views: 23433

Re: Mad Professor - Simble [traced]

Hi, I offered this to Bugg but got no reply. Its only a rough drawing of a unit I had for a brief period some years ago. Some weird stuff going on...........but it is a Zen derivative. Gooped to blazes................ The person sanding the IC had an off day, I could still make out the IC code if it...
by John G
25 Jan 2020, 06:37
Forum: Boutique Stompboxes dissected...
Topic: Kingsley - Page (gutshots)
Replies: 32
Views: 4569

Re: Kingsley Page Gutshots

Hi,
First photo shows, at the extreme right hand end a 10Meg ohm to a ground.
The top end has the input coax connected, and most probably a 33K ohm resistor going up to the first grid.
This is NOT a true bypass design as the input to the tube is across the signal path at all times.
John
by John G
22 Jan 2020, 22:49
Forum: Boutique Stompboxes dissected...
Topic: Kingsley - Page (gutshots)
Replies: 32
Views: 4569

Re: Kingsley Page Gutshots

Hi,
10 Meg ohm from input to ground.
John
by John G
26 Sep 2019, 07:23
Forum: Boutique Stompboxes dissected...
Topic: Lovepedal Super Six Stevie Mod [traced]
Replies: 27
Views: 6940

Re: Lovepedal Super Six Stevie Mod [traced]

Hi, I'm confused now.................the photo shows an IC and it has been suggested that it is in fact a Timmy variant, TSG boards seems quite different. Can someone enlighten me. As far as the Photo goes, I see that at least one of the 3K3 resistors is missing and another on the right hand side, S...
by John G
22 May 2018, 01:07
Forum: Boutique Stompboxes dissected...
Topic: Lovepedal Super Six Stevie Mod [traced]
Replies: 27
Views: 6940

Re: lovepedal super six stevie mod? [traced]

Hi,
Is the picture posted the Love pedal ??
If so do you have any other photos.
Thanks
John
by John G
16 Jan 2015, 04:38
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Alf, You could always just change the input cap to say the 10nF value, break the link from pins 6-7 on the op-amp and add the 4k7 (or 3k3 in Barbers schemo) between pin 6 and V/2, add say a 20k trim pot with the 100nF (82nF in Barbers schemo-I don't have that value) across it between pins 6 and 7 an...
by John G
14 Jan 2015, 20:38
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Alf,
Here it is in gif form.
Forgot to add to schemo teh 10Mohm ground ref resistors between the input caps and ground.
John
Z_drive modified.gif
by John G
13 Jan 2015, 23:31
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Alf,
This is the current schemo.
No mid, I'm sure there is still room for improvement, there are much greater minds than mine on this Forum.
Cheers
John
Z_drive modified.sch
(17.7 KiB) Downloaded 185 times
by John G
12 Jan 2015, 22:17
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Hi,
Ok so I lied about the KOi being on this thread.
Don't know where I found it, so here is the schemo
John
KOi OD.jpg
by John G
12 Jan 2015, 20:27
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Alf, Looks as if I will have to try a different IC and FETS I will need to purchase them. Attached is the MADBEAN Sparkplug pedal which he says is derived from the Barber Tonepump. It is on his site. The Koi values are in this thread back a few pages as is the post suggesting lowering the input cap ...
by John G
12 Jan 2015, 01:45
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Hi again, Played with the pedal over the last few days and I believe I have a more refined Zen version more polite and lets me hear more of the natural Guitar. (Just like the G2D Creamtone does) I like the additional bass control and input select switch as this allows you to taylor the pedal to suit...
by John G
08 Jan 2015, 22:35
Forum: Boutique Stompboxes dissected...
Topic: Hermida Audio - Zendrive [ goop-alarm ] [traced]
Replies: 342
Views: 149556

Re: Hermida Audio - Zendrive [ goop-alarm ] [traced]

Hi, After the Xmas pud had been digested, and all things Xmas was generally over I decided to revisit a couple of OD pedals. The first being the G2D creamtone clone I had built several years ago. I still like its sound especially with the Strat, so I left it aline. My attention then turned to my Zen...
by John G
08 Jun 2014, 23:16
Forum: Boutique Stompboxes dissected...
Topic: Mad Professor - Simble [traced]
Replies: 55
Views: 23433

Re: Mad Professor Simble [traced]

Hi,
Just a thought................could that transistor and diodes etc be part of the LED control cct concidering there is only a DPDT stomp switch fitted.
This may also explain the latency with the LED when switcihed.
John
by John G
15 May 2014, 00:19
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 108491

Re: Dumbloid [traced]

Hi,
Tried the small signal diodes they work, but still prefer the sound of power diodes. I have now increased the series resistor to 22K, and kept the back to back LEDs in the second stage.

Now back to my day job.
John
by John G
12 May 2014, 02:55
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 108491

Re: Dumbloid [traced]

Me again, Tried zeners (3V6) with series resistor, didn't like it as much as the power diodes. Tried 5 X diodes with 10K series resistor, but I prefered the 4 X diode with 15K resistor, very subjective. If you make it too smooth and compressed then you are in danger of re inventing the TS all over a...
by John G
11 May 2014, 02:28
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 108491

Re: Dumbloid [traced]

Hi, Since my last post I have experimented with adding 1N4001 diodes aross the feedback path on the first stage. I used 4 diodes in series and another 4 in series in the oposite direction (symetrical clipping) I also added a 15K ohm( fitted a 50K pot and adjusted it by ear) resistor in series with t...
by John G
10 May 2014, 23:43
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 108491

Re: Dumbloid [traced]

Hi again, I decided to put one togethe, a couple of hours work. Yep ! it rattles well on the trailing edge, The offset I suggested didn't do anything to reduce the rattle on the firsts stage(already sitting at mid rail) but it did on the second stage when the ACCENT control was well advanced...........
by John G
08 May 2014, 02:16
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 108491

Re: Dumbloid [traced]

Hi, Just a thought re fuzzy trailing edge, has anyone tried changing the mid rail point voltage (approx 4.5v) to a higher or lower value to see if an introduced offset lessens or worsens this decay artifact. I noticed the Hotcake effects pedal bias is about 20% offset...........this maybe for comple...
by John G
04 Jan 2014, 23:49
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Danelectro - DJ-20 Rocky Road Spin Speaker [schematic]
Replies: 2
Views: 1961

Re: Danelectro Rocky Road schematic [schematic]

Attached are my mods for f/sw distortion and re EQ.
John