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by Nocentelli
22 Jun 2020, 17:00
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - The Unpleasant Surprise
Replies: 21
Views: 7425

Re: Fairfield Circuitry - The Unpleasant Surprise

Come on, Bugg, get the schematic up
by Nocentelli
08 Jun 2020, 12:14
Forum: Boutique Stompboxes dissected...
Topic: Crazy Tube Circuits - Constellation Fuzz
Replies: 7
Views: 591

Re: Crazy Tube Circuits Constellation Fuzz

Ben N wrote:
07 Jun 2020, 14:08
Huh! So it really is just a 2P6T rotary switch! Looks pretty traceable/DIY-able, doesn't it?
Yep, although it seems weird to go to all that effort and not include a voltage inverter so you have to use a separate power supply.
by Nocentelli
05 Jun 2020, 13:51
Forum: Boutique Stompboxes dissected...
Topic: Analogman KOT Mystery "H" IC
Replies: 12
Views: 1549

Re: Analogman KOT Mystery "H" IC

this resistor has clearly been painted a red band (stock 1k) over a yellow band (100k) on the high gain side, would be interesting to see if it's the same in your pedal. Keep an eye out for any other resistor bands that look painted. https://www.freestompboxes.org/download/file.php?id=34943 Sad
by Nocentelli
12 May 2020, 12:15
Forum: DIY Stompbox designs
Topic: light filter
Replies: 1
Views: 642

light filter

https://www.youtube.com/watch?v=waIgMHPoPRM Simple LPF-ish filter circuit using one opamp, based on the filter from Ray Wilson's Weird Sound Generator ...but with the frequency sweep controlled by a proximity-detecting external LDR, manipulated by foot or hand (nicked from deadastronaut's "Lightwah...
by Nocentelli
11 May 2020, 17:27
Forum: Boutique Stompboxes dissected...
Topic: Lumpy's Tone Shop - Lemon Drop [traced]
Replies: 26
Views: 11036

Re: Lumpy's Tone Shop - Lemon Drop [traced]

Lemon Drop 4-knob.png Does the BJT emitter also need a DC resistance path, i.e. a fixed 1k to ground as well as the AC path via the pre-gain pot cap? I honestly don't know. I drew these from a trace at Guitar FX Layouts. There is a thread on the forum there. My mistake, I didn't spot "pregain-1 to ...
by Nocentelli
11 May 2020, 09:46
Forum: Boutique Stompboxes dissected...
Topic: Lumpy's Tone Shop - Lemon Drop [traced]
Replies: 26
Views: 11036

Re: Lemondrop? [traced]

HamishR wrote:
11 May 2020, 05:09
Lemon Drop 4-knob.png
Does the BJT emitter also need a DC resistance path, i.e. a fixed 1k to ground as well as the AC path via the pre-gain pot cap?
by Nocentelli
07 May 2020, 16:31
Forum: Boutique Stompboxes dissected...
Topic: Way Huge - Pork Loin [traced]
Replies: 96
Views: 41957

Re: Way Huge - Pork Loin [traced]

The volume pot has lug 1 grounded in the schematic.
by Nocentelli
05 May 2020, 13:01
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) - Gate Crasher
Replies: 14
Views: 1168

Re: Function f(x) - Gate Crasher

I can only see one 1M in the upper section (assuming that all the components below the row of pots in the middle are used in the bypass switching).
by Nocentelli
05 May 2020, 12:37
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) - Gate Crasher
Replies: 14
Views: 1168

Re: Function f(x) - Gate Crasher

I also think they might be doing it with the schmitt-trigger and without the first XOR gate, as this gate control is also described in the Parasit Link I thought there were not enough 1M resistors for a schmitt trigger made from two of the 4049 inverters? There is a 1M pulldown at the input of the ...
by Nocentelli
05 May 2020, 11:13
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) - Gate Crasher
Replies: 14
Views: 1168

Re: Function f(x) - Gate Crasher

Working on schem...
by Nocentelli
04 May 2020, 08:31
Forum: Boutique Stompboxes dissected...
Topic: Function f(x) - Gate Crasher
Replies: 14
Views: 1168

Re: Function f(x) - Gate Crasher

Seiche wrote:Thanks for chiming in :thumbsup

So what's that 10K pot in the escobedo section that I labelled "TXT?" doing?
Blend? Dials the in the amount of octave
by Nocentelli
14 Apr 2020, 13:33
Forum: Boutique Stompboxes dissected...
Topic: Bigfoot FX Magnavibe [traced]
Replies: 176
Views: 45266

Re: Bigfoot FX Magnavibe [traced]

Here is how you could wire the two pots to a DPDT (e.g. toggle switch) magnavibe settings swithc.jpg If you want an LED to show which speed is selected, you could take the DPDT scheme and use a 3PDT with a two colour/bicolor LED magnavibe bicolor for 3PDT.png or a 3PDT with two separate LEDs: magnav...
by Nocentelli
14 Apr 2020, 09:33
Forum: Boutique Stompboxes dissected...
Topic: Bigfoot FX Magnavibe [traced]
Replies: 176
Views: 45266

Re: Bigfoot FX Magnavibe [traced]

Two sets of level + rate controls and a DPDT toggle switch to choose between them is perfectly possible. Can provide a diagram if you need further advice.
by Nocentelli
07 Mar 2020, 16:30
Forum: Boutique Stompboxes dissected...
Topic: Roger Mayer - Fuzz Face AC128
Replies: 7
Views: 1238

Re: Roger Mayer - Fuzz Face AC128

modman wrote: With two 1k8 resistors? :scratch: :hmmm:
I would be very interested to hear this unit.
The picture makes them look more like 18k, but still fairly odd either way
by Nocentelli
27 Feb 2020, 23:29
Forum: DIY Stompbox designs
Topic: weirdbrato 2399
Replies: 10
Views: 1091

Re: weirdbrato 2399

heaterman wrote:Would be nice if one could change the speed of all square waves together with one pot
Four LDRs circled around an LED, brightness controlled by a pot?
by Nocentelli
23 Feb 2020, 22:48
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - Timmy
Replies: 2
Views: 747

MXR - Timmy

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by Nocentelli
23 Feb 2020, 21:41
Forum: DIY Stompbox designs
Topic: synchronized sample rate reducer
Replies: 2
Views: 483

Re: synchronized sample rate reducer

Hi, welcome to the forum. Really interesting circuit - Can you explain a little more about how it works/what if does? I get that the clean buffered input is fed through to the inverting output; Some of the dry signal is also heavily fuzzed and fed into a comparator which wiggles the two photofets th...
by Nocentelli
17 Feb 2020, 12:23
Forum: Boutique Stompboxes dissected...
Topic: Wampler Velvet Fuzz [traced]
Replies: 174
Views: 64873

Re: Wampler Velvet Fuzz [traced]

Quick update - I recently decided to buy four SMD J201s and appropriate sot23 adaptor boards from www.bitsbox.co.uk, really just to find out how tricky it would be for my aging eyes and clumsy hands (answer - pretty tricky BTW) but i was surprised and delighted to discover the first three JFETs I ma...
by Nocentelli
09 Feb 2020, 16:41
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Question about the old EHX Doctor Q envelope follower.
Replies: 4
Views: 593

Re: Question about the old EHX Doctor Q envelope follower.

It's an input level-sensitive effect, so a guitar with beefy output humbuckers will trigger at a lower sensitivity setting then a strat with lower output single coils. A booster in front of the pedal will help, but although the signal at the envelop detector will be boosted, so will the signal to th...