Search found 163 matches

by cpm
18 Jan 2011, 13:27
Forum: ICs (Integrated Circuits)
Topic: cd4049ube replacement
Replies: 1
Views: 2902

Re: cd4049ube replacement

whatever, as long its 4049U... (U for "unbuffered")
by cpm
30 Dec 2010, 23:40
Forum: Power
Topic: Rat voltage divider question
Replies: 5
Views: 3586

Re: Rat voltage divider question

that voltage divider is meant to be a half-voltage reference rail, and is required. Powering with 18v, mid-rail is 9v, Powering with 9v, mid-rail is 4.5v... you get the pattern however, i dont think that the rat topology gets a lot of variation from supply voltage, since the clipping is done by diod...
by cpm
17 Sep 2010, 20:02
Forum: Printed/Published Online Designs
Topic: Ultra low current LED indicator for stompboxes
Replies: 4
Views: 1682

Re: Ultra low current LED indicator for stompboxes

i use some bright clear yellow LEDs, that get pretty bright with even with a 47k resistor
by cpm
12 Sep 2010, 14:38
Forum: Boutique Stompboxes dissected...
Topic: Zvex - Mastotron [guts, schematic, PCB layout] [traced]
Replies: 47
Views: 13396

Re: zvex mastotron [traced]

what kind of pots did you use, and where do you get them?
by cpm
08 Sep 2010, 11:19
Forum: DIY Projects
Topic: Multiclipper!
Replies: 12
Views: 2154

Re: Multiclipper!

i think i reckon that "crossover short" thing. It's subtle but seemes like i could notice some different sound from a plain series diodes. Sometimes I like a strong asymetric clipping, i usually put 2 mosfet in series (in opposite orientation). This would have a quite high clip thershold (...
by cpm
27 Aug 2010, 21:28
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EHX - Electric Mistress Flanger [schematic]
Replies: 55
Views: 28915

Re: EH - Electric Mistress Flanger [schematic]

would anyone happen to have schems/guts for eh5100 D? mine is 5100D https://www.freestompboxes.org/viewtopic.php?f=10&t=6142 the schematic than is around the web is almost accurate, the only difference is some more caps on the board, all doing some filtering on power and the clock/LFO sections....
by cpm
04 Aug 2010, 16:36
Forum: Parts & Tools Sourcing & Trading
Topic: CoolAudio Group Buy
Replies: 83
Views: 35980

Re: CoolAudio Group Buy

theehman wrote:I had to up quantities a bit to meet their minimum but I should have extra parts if anyone needs to bump their quantities up.
i'll probably do :D
by cpm
04 Aug 2010, 15:49
Forum: Parts & Tools Sourcing & Trading
Topic: CoolAudio Group Buy
Replies: 83
Views: 35980

Re: CoolAudio Group Buy

yes...

i'm +100$ due on it
by cpm
23 Jul 2010, 08:43
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - Formula No. 5 [traced]
Replies: 307
Views: 122994

Re: Catalinbread - Formula No. 5 [traced]

soulsonic wrote:Oh, it doesn't have the signature 5E3 channel canceling... I guess I'm the only one that does that. :?
what is that about?
by cpm
09 Jul 2010, 06:23
Forum: Boutique Stompboxes dissected...
Topic: Fulltone - ´70 pedal
Replies: 142
Views: 43606

Re: Fulltone - ´70 pedal

I have been wanting a proper (accurate) '70 schematic for some time now. so its AFFF (another fuc...g fuzz face), in paper is very much like the usual FF, and in soun is as shitty as the rest. the underboard cap is 100pF, looks like a late addition due to unstability. Changing the emitter cap to an...
by cpm
07 Jul 2010, 10:00
Forum: Printed/Published Online Designs
Topic: new Russian FET tube emu article
Replies: 6
Views: 3009

Re: new Russian FET tube emu article

probably it makes a slight gating, to avoid background noise?
by cpm
28 Jun 2010, 14:29
Forum: Parts & Tools Sourcing & Trading
Topic: KNOBS prices are hard to take
Replies: 4
Views: 1435

Re: KNOBS prices are hard to take

Have you tried these aluminium knobs from Futurlec: http://www.futurlec.com/Switches/KNOB3.shtml ? Just $0.70 a piece. i've used two variants of those, which differs only on the set screw: one is standard screw and other is hexagonal "hole" (a pita, i must say) they are quite rough, and n...
by cpm
24 Jun 2010, 23:13
Forum: DIY Projects
Topic: Compression Sustainer
Replies: 143
Views: 24966

Re: Compression Sustainer

i dont know how it is supposed to behave, or maybe i got something wrong on the breadboard... with the diodes the compression is limited to the clipped amplitude at the output being big enough to push the FET. without diodes... the FET is so open that it squish and farts everything down. anyway, bee...
by cpm
05 Jun 2010, 07:52
Forum: Transistors
Topic: a case against the j201?
Replies: 19
Views: 35768

Re: a case against the j201?

so the J201 is useful for a lower current, lower voltage, higher gain than most of other FET. That's a good reason for the use it has found among us. That article is making a point, but its talking about buffers, which has another set of requeriments. I use the BF245 series, which i can buy locally,...
by cpm
02 Jun 2010, 10:51
Forum: DIY Projects
Topic: my new delay, over the top PT2399's
Replies: 57
Views: 34094

Re: my new delay, over the top PT2399's

the tradeoff for the filtering seems to be some phase alterations, i guess that causes the reverby sound, which is cool though What is the shortest possible delay time the usual for the PT, i ddont know exactly, but very short. Can the modulation sound more like the chorus/vibrato in a EHX Deluxe Me...
by cpm
01 Jun 2010, 22:53
Forum: DIY Projects
Topic: my new delay, over the top PT2399's
Replies: 57
Views: 34094

Re: my new delay, over the top PT2399's

here is some samples i recorded some time ago from an early version

http://www.soundclick.com/bands/page_so ... ID=8355105
by cpm
31 May 2010, 16:40
Forum: DIY Projects
Topic: my new delay, over the top PT2399's
Replies: 57
Views: 34094

my new delay, over the top PT2399's

This is my attempt into a delay, a not so simple one. My aim is to squeeze the maximum delay times and clean repeats from the PT chips, and add some fancies that match my taste for delay, which is some modulation and other tricks in order to achieve a very atmospheic and lush sound. It provides up t...
by cpm
31 May 2010, 08:09
Forum: Printed/Published Online Designs
Topic: 555 based tremolo
Replies: 6
Views: 3337

Re: 555 based tremolo

deathofaparty wrote: I built practically this same circuit but had terrible ticking from the 555 unless the grounds were kept separate, which was too impractical
separate grounds is a good practice (if not a must) wherever you are mixing oscillators and audio stages
by cpm
28 May 2010, 16:23
Forum: Printed/Published Online Designs
Topic: Design Philosophy - Fuzz Face
Replies: 69
Views: 19017

Re: Design Philosophy - Fuzz Face

on some fuzz experimentations i found that a big cap may shift the bias which helps in getting the some of the "burst and splattered" tones typically (i think...) associated with Ge fuzzes, without the piercing tones of the Si. may it be the coupling cap from a pre-amp stage into the fuzz?...