Search found 474 matches

by devastator
15 May 2015, 12:48
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

the ads should be clocked by an external (and may be variable) clock. So tthe sampling rate reducer isn't done into the atmega but directly at the ADC which save clock cycles for the µC.

http://www.ti.com/lit/ds/symlink/ads7816.pdf
by devastator
15 May 2015, 11:04
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

I had a similar idea. Although I simply used a low pass filter for the tone control and some shift register via SPI to reduce pincount. I made mistakes in the op-amp input orientation but the idea remains. https://smokingtip.files.wordpress.com/2015/05/bit_crushed.png (too big for direct image into ...
by devastator
14 May 2015, 12:29
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

There's some cheap (trough hole) SPI double DAC from microchip, really easy to use. Otherwise, if nasty 8bit is desired one can use a R2R (I had some bourns integrated one, very handy little thing no need to match resistors). But it requires a complete port, however a shift register can be used with...
by devastator
13 May 2015, 20:22
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

very nice software ! maybe you could add fonction to "linearze" the waveforms and avoid distortion bit. But nonetheless very nice. would you share the code ? I don't know what JS is. Here's what I had in mind for the actual embedded solution : https://github.com/ThebigDickhead/AVR_PROG/blob/master/b...
by devastator
11 May 2015, 10:42
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

while (true) { //repeat indefinitely int inValue = adcRead(); int outValue = wavetable[inValue]; dacWrite(outValue); delay(samplingPeriod); that must be it. I had a go few days ago, I inputed the guitar signal and the output via SPI DAC was very nasty (in a bad way). You've to love lo-fi stuff :lol...
by devastator
01 May 2015, 14:06
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

Looks like the wave table simply defines the transfer function, though I don't know how it's actually implemented (lookup tables?). certainly look up table I think. Then it feeds the µC and it is combinated with the wawetables such as : There's no mixing of the DAC signal with the original signal ?...
by devastator
01 May 2015, 10:25
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

all the interest for this is dead ?

can someone explain the relation between the wavetable and the incoming signal ?
by devastator
22 Apr 2015, 10:50
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

any progress on this project ?

I myself played around with digital VCO and bitcrushing, sampling rate and internal modulation things with an AVR 8bit. Way too slow for serious work (unless one want somes nasty distortion/aliasing added to it) but can be really dirty and nice for noise thing.
by devastator
20 May 2014, 21:38
Forum: DIY Stompbox designs
Topic: Quasi Filter Sample Hold design
Replies: 7
Views: 3489

Re: Quasi Filter Sample Hold design

why not using the original transistor noise generator as the Random generator ? works good !

http://ustomp.com/files/fshschematic.gif

IC3 and Q4.

As I see it, creating something similar with a simple power supply is quite doable.
by devastator
30 Apr 2014, 17:31
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dunlop - TVP-1 Tremolo Volume
Replies: 0
Views: 1393

Dunlop - TVP-1 Tremolo Volume

hi, is there someone with a bit of imformation about this TVP-1 ? I have to fix one (lfo isn't working, or the CMOS switching dead, don't know yet) but that thing is really complex. I'm in the process of tracing the schematic but it takes ages to do so. There're CMOS switch, Nor gate, JFET switching...
by devastator
21 Jan 2014, 17:02
Forum: Boutique Stompboxes dissected...
Topic: Jack Deville - Dark Echo [traced]
Replies: 32
Views: 9911

Re: Jack Deville - Dark Echo [traced]

C'mon Mr Deville we know you want to reveal the secret ! :mrgreen:

by the way, you do a really cool work on your line of pedal. Really nice and original . You micro-controlled double switching system is really inspiring.
by devastator
18 Sep 2013, 12:34
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

the pedal format is fixed ? I thought it could interesting to implant the circuit is a rack format case with a remote footswitch. And if storage I guess some would like footswitch to access patches ect...

actually pedal format isn't really that good with big circuit :mrgreen:
by devastator
15 Sep 2013, 16:24
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

that could be a neat project ! but instead of copying why not creating something new and go further ?
by devastator
27 Jun 2013, 10:50
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread Echorec - Pic and schematic
Replies: 34
Views: 13372

Re: Catalinbread Echorec - Pic and schematic

loylo wrote:Sorry for the late answer.

It is this book:
http://www.elektor.fr/products/books/au ... 2601.lynkx

But I don't know if it has been translated...
I was thinking about getting a DSP/µC book , is it good ?
by devastator
24 Jun 2013, 19:58
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

Arduino plateform is a good start for programming µC
yep , I'm waiting for an arduino board ordered last week. I started studying some exemple codes available.
by devastator
24 Jun 2013, 15:24
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

Acutally cloning isn't what I'm looking for. I just want to understand the concept and general layout.

I started getting into µC and it's always good to look at other's work to understand things.
by devastator
21 Jun 2013, 18:44
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

:shock:

I didn't know the synthmonger , fuzzmonger ect.... Really cool stuff !

I just have to find more imformations about their circuits now :lol:
by devastator
20 Jun 2013, 19:15
Forum: Boutique Stompboxes dissected...
Topic: WMD Geiger Counter - [gut shots]
Replies: 139
Views: 30465

Re: WMD Geiger Counter - [gut shots]

Yo guys. I have a proposition for you. I have become decent at programming the FV-1 DSP chip. This kind of effect isn't that difficult with this sort of architecture. I am up to do some coding. This would not be a clone of the Geiger Counter, but it would be the only wavefolding digital distortion ...
by devastator
08 Jun 2013, 20:27
Forum: Ready-To-Build Effect Projects
Topic: The chopper - duty cycle tremolo
Replies: 0
Views: 260

The chopper - duty cycle tremolo

Hi guys, Just wanna share a nice project I've just finished . it's a tremolo with duty cycle variation . The lfo isn't really mine it's a modified Ray Wilson's LFO . I changed few values to make it better for a tremolo project. few words about it . I replaced the tradditional square wave by a kind o...
by devastator
24 May 2013, 19:29
Forum: Boutique Stompboxes dissected...
Topic: Death By Audio - Echo Dream 2 [traced]
Replies: 27
Views: 11672

Re: Death By Audio Echo Dream 2 [traced]

jymaze wrote:The PCB design is really looking amateurish and the traces are so thin... I would be ashamed if I was the designer.
I'd be more ashamed by the poor soldering job . Look at the footswitch pins which scream for solder !

these guys are really a joke ! :applause: