Search found 372 matches

by DWBH
01 Aug 2014, 11:56
Forum: Amplifiers
Topic: Ebook request: Designing Power Supplies for Tube Amplifiers
Replies: 5
Views: 6454

Ebook request: Designing Power Supplies for Tube Amplifiers

Does anyone have a pdf version of this book that can share?
I have the first one and it's a great book. Sadly I can't find the 2nd book (Designing Power Supplies for Tube Amplifiers by Merlin Blencowe) - it's out of print and there's no sight of a pdf version online.
by DWBH
12 May 2014, 20:37
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - SFT [traced]
Replies: 278
Views: 105146

Re: Catalinbread - SFT [traced]

https://dl.dropboxusercontent.com/u/15423022/10335709_10202843926032815_1423873188_n.jpg Here's one I built for my bassist friend of mine. Regarding the weird connection on the pot, you're all talking about that connection between lug2 and the resistor to ground right? What's the catch? Should it b...
by DWBH
08 Apr 2014, 09:50
Forum: Boutique Stompboxes dissected...
Topic: Mwfx judder
Replies: 18
Views: 5714

Re: Mwfx judder


Judder Clone ^^
by DWBH
07 Apr 2014, 20:16
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pigtronix - Keymaster [schematic]
Replies: 10
Views: 7610

Re: Pigtronix KEYMASTER schematic, guts [schematic]

On Pigtronix specs it says the in/out boosts are to/from the loops. That is true, but even with both loops off they are still boosting the signal, right? I thought they were there to boost send/return levels for pedals with volume drops/etc, but apparently they also boost the 'uneffected' signal. Ri...
by DWBH
05 Apr 2014, 15:06
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pigtronix - Keymaster [schematic]
Replies: 10
Views: 7610

Re: Pigtronix KEYMASTER schematic, guts [schematic]

Anyone built this?
Maybe I'll try it, I want to use some guitar pedals with vocals. Though I think the boost function would make more sense in the Send/Return loop rather than in the input/output sections.
by DWBH
24 Mar 2014, 10:24
Forum: Diodes & LEDs
Topic: Germanium diodes- the definitive answer
Replies: 34
Views: 44261

Re: Germanium diodes- the definitive answer

How about note decay?
I've always had some kind of crackly/sputtery decay when using LEDs as clippers. Silicon/Mosfets/Ge were always smoother. Sharper I-V response?
by DWBH
02 Mar 2014, 19:01
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - Randy's Revenge
Replies: 46
Views: 9821

Re: Fairfield Circuitry - Randy's Revenge

Guillaume himself said that the oscillator used 4 OTAs (thus, two LM13700).
by DWBH
22 Feb 2014, 19:23
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - Randy's Revenge
Replies: 46
Views: 9821

Re: Fairfield Circuitry - Randy's Revenge

Beautifull board. Here I was thinking the filter was also LM13700-based. Guess not. Vactrol is used for the filter, I guess. It has three 'legs' on the LDR side, so probably it's controlling R1 and R2 here? http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Sallen-Key_Lowpass_General.svg/400px...
by DWBH
22 Feb 2014, 00:02
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - Randy's Revenge
Replies: 46
Views: 9821

Re: Fairfield Circuitry - Randy's Revenge

Following this thread, and because I'm building the said LM13700 sine wave oscillator mentioned previously, has anyone got a correct spice model for it? I've been running some simulations with Ltspice with a voltage-to-current source very similar to this one (http://www.birthofasynth.com/Thomas_Henr...
by DWBH
24 Jan 2014, 21:44
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - Randy's Revenge
Replies: 46
Views: 9821

Re: Fairfield Circuitry - Randy's Revenge

Hey there guys, I've been gathering some schematics for a ring modulator build. I've settled for an AD633 multiplier, and will also try the 4xOTA oscillator that Guillaume suggested. I've also started to think about putting a LPF after the modulated signal - yes, this is becoming increasingly simila...
by DWBH
22 Jul 2013, 21:12
Forum: DIY Stompbox designs
Topic: lets design the best pedal-power unit ever...
Replies: 38
Views: 13129

Re: lets design the best pedal-power unit ever...

Hello World. I've been out of DIY activity for a while, but now I've some spare time I need to finish a couple of unfinished projects. One of them is a power supply I built last year. It had 4 outputs. Two 12v transformers, each with 2 outputs, making a total of 4 secondary taps. Each tap with a 780...
by DWBH
19 Feb 2012, 22:54
Forum: Boutique Stompboxes dissected...
Topic: TC Electronic - Röttweiler
Replies: 29
Views: 5308

Re: TC Electronic - Röttweiler

Anyone bought it yet? :D
by DWBH
16 Jan 2012, 23:43
Forum: Pimp-My-Cheap-Pedal
Topic: Ibanez DE-7 mods thread
Replies: 28
Views: 21542

Re: Ibanez DE-7 mods thread

Try bypassing the jfet, connecting gate and drain together, besides lifting the diode.
by DWBH
10 Jan 2012, 21:04
Forum: Pimp-My-Cheap-Pedal
Topic: Ibanez DE-7 mods thread
Replies: 28
Views: 21542

Re: Ibanez DE-7 mods thread

I just got a new DE-7, so I can finally mod it :twisted:
However, it'll take a while, since my final exams are just around the corner - and unfortunately transistor flip flops and jfet switching aren't the subject in my electronics course :lol:
by DWBH
07 Jan 2012, 15:44
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Stereo Memory Man w/ Hazarai mod?
Replies: 52
Views: 14666

Re: Stereo Memory Man w/ Hazarai mod?

Open this link: http://www.falstad.com/circuit/#%24+1+5.0E-6+10.20027730826997+50+5.0+50%0AL+288+192+288+112+0+1+false+5.0+0.0%0Ar+288+256+288+192+0+1000.0%0AM+288+256+464+256+0+2.5%0Ag+288+352+288+384+0%0As+288+352+288+256+0+1+true%0A When the footswitch isn't pressed, the input is always HIGH. Whe...
by DWBH
05 Jan 2012, 23:33
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Stereo Memory Man w/ Hazarai mod?
Replies: 52
Views: 14666

Re: Stereo Memory Man w/ Hazarai mod?

You don't solder the transistors to that pad where it says R41/R42, you solder them directly on the encoder.

Actually, I don't know what's the value of those resistors, but if they're not big you probably could solder. I don't know, just checking. Solder directly on the encoder, just in case.
by DWBH
04 Jan 2012, 22:47
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Stereo Memory Man w/ Hazarai mod?
Replies: 52
Views: 14666

Re: Stereo Memory Man w/ Hazarai mod?

Base of transistor for the preset switch comes from arduino. Emitter and Colector are both soldered directly to the terminals of the switch. One of them is in fact ground, but it doesn't matter which transistor pins connect where. The emitter pins of the other transistors are soldered to the middle ...
by DWBH
03 Jan 2012, 10:51
Forum: Pimp-My-Cheap-Pedal
Topic: Ibanez DE-7 mods thread
Replies: 28
Views: 21542

Re: Ibanez DE-7 mods thread

Trails mod The flip flop circuit kills two signals. One that goes from the compander to the delay chip, and the delayed signal itself. Schematic wise, we're looking at the R33/D5/D4 junction. Killing just the first signal, leaving the delayed one intact, should work - so, keep the base of Q6 LOW at...
by DWBH
02 Jan 2012, 22:06
Forum: Pimp-My-Cheap-Pedal
Topic: Ibanez DE-7 mods thread
Replies: 28
Views: 21542

Re: Ibanez DE-7 mods thread

I'm not sure on it. Currently I'm DE7-less, so I haven't had the chance to try it.
by DWBH
02 Jan 2012, 20:50
Forum: Pimp-My-Cheap-Pedal
Topic: Ibanez DE-7 mods thread
Replies: 28
Views: 21542

Re: Ibanez DE-7 mods thread

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