Search found 18 matches

by DSV
01 Aug 2020, 13:34
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread Antichthon
Replies: 1
Views: 2183

Re: Catalinbread Antichthon

Hi everyone, I'd like to share my thoughts on the tremolo section for the Antichthon and especially the control of the rate through the guitar volume pot. As a note, I do not own the pedal nor have played it - this is my best guess. My impression is that the pedal works based on an RC phase oscillat...
by DSV
28 Nov 2012, 12:54
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dunlop Rockman ACE [schematic]
Replies: 24
Views: 8978

Re: Dunlop Rockman ACE [schematic]

This is a schematic of the Sustainor I found a whle ago on the net:
http://www.4shared.com/zip/vuTn0kWO/roc ... ainor.html

Quite complex circuitry, though the main idea (compression -> distortion -> cab sim) was already found in the headphones amps.
by DSV
27 Jun 2011, 14:30
Forum: Parts Sourcing & Trading
Topic: Where to order decent pcb's in europe?
Replies: 16
Views: 2694

Re: Where to order decent pcb's in europe?

In Germany i used to have them done at platinenbelichter:
http://platinenbelichter.de/html/preise.html
I used to put all the pdf layouts in one big sheet (with inkscape) and then send the whole pdf page to them. You can also have your pcbs cut and drilled for an additional cost.
by DSV
06 Apr 2011, 08:28
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dunlop Rockman ACE [schematic]
Replies: 24
Views: 8978

Re: Dunlop Rockman ACE [schematic]

A little mistake: R35 limits the compression action (minimum gain), as well as R34 (maximum gain). is actually: R34 sets the minimum gain of the U2a stage, at 1+R22/R34 = 1+160k/56k = 4 and R35 sets the maximum gain, at 1+R22/(R_Q1+R35) Oh, and D4+the LED limit the negative voltage going to Q1: they...
by DSV
06 Apr 2011, 06:58
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Dunlop Rockman ACE [schematic]
Replies: 24
Views: 8978

Re: Dunlop Rockman ACE [schematic]

U2A + the JFET is a compressor. This is typical of rockman units. How compression works: U2a, at the negative input, has 2 capacitors (big ones for flat low frequency response of the stage), and then (R35 in series with Q1) in parallel with R34 - when Q1 has a low negative control voltage at the gat...
by DSV
06 Mar 2009, 21:28
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

Here are some new clips. After listening to them again, here are my impressions: Two minutes to 2h in the morning : Iron Maiden style. Probably thin. I scooped the mids on this one Plexi style! : maybe a tad too fizzy Thunderstruck : instrument placement ain't that good, nor is playing Sharp dressed...
by DSV
21 Feb 2009, 13:25
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

Finished! Here are the last photos ... https://img19.imageshack.us/img19/6941/wiringpcball1.th.jpg https://img24.imageshack.us/img24/9020/wiringpcball2.th.jpg https://img26.imageshack.us/img26/5381/wiringpcbpsu.th.jpg https://img27.imageshack.us/img27/8426/wiringjack.th.jpg https://img100.imageshack...
by DSV
17 Feb 2009, 22:19
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

Since the PCB is verified, here it is!
http://www.techniguitare.com/projets/Ch ... preamp.pdf

And here is the parts layout:
Image

:D
by DSV
17 Feb 2009, 13:16
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

Offboard wiring is almost done : https://img172.imageshack.us/img172/2782/wiringoffboard1cd0.th.jpg https://img223.imageshack.us/img223/8213/wiringoffboard2ku0.th.jpg https://img5.imageshack.us/img5/8501/wiringbox1dm3.th.jpg https://img5.imageshack.us/img5/2667/wiringbox2os9.th.jpg https://img18.ima...
by DSV
14 Feb 2009, 15:50
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

A little update: resistors, sockets, capacitors and the trimmer have been soldered on the main board. https://img19.imageshack.us/img19/1853/pcbmainresvk7.th.jpg https://img24.imageshack.us/img24/1703/pcbmainsocketsnr6.th.jpg https://img26.imageshack.us/img26/5930/pcbmainfullfronthw0.th.jpg https://...
by DSV
13 Feb 2009, 22:10
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Re: Infinity: an universal guitar preamplifier!

Glad you like it!

Getting further ... box is drilled and jumpers are soldered on the main PCB.
Image Image Image
by DSV
12 Feb 2009, 20:20
Forum: Ready-To-Build Effect Projects
Topic: Infinity: an universal guitar preamplifier!
Replies: 9
Views: 2232

Infinity: an universal guitar preamplifier!

Hi all! About 2 months ago, I started a project which transformed a BSIAB into an universal guitar preamp for DI applications , and presented it thorugh a youtube video (see link below). Now that I have received all the PCBs and the components, I'd like to share pics the build of a single channel pr...
by DSV
12 Sep 2008, 12:41
Forum: DIY Stompbox designs
Topic: DIEFET: Jfet simulation of the Diezel VH4
Replies: 222
Views: 77070

Re: DIEFET: Jfet simulation of the Diezel VH4

I followed the project on techniguitare. It is not a traditional simulation with the ROG method. In fact it does not stem from the schematic of the Diezel, but from the Dual Rectifier. Then a frequency analysis of a VH4 has been performed, in order to design a post-equalizer capable of mimicking the...
by DSV
12 Aug 2008, 20:37
Forum: Boutique Stompboxes dissected...
Topic: Hadley - Harmonic Converger
Replies: 130
Views: 29185

Re: Hadley - Harmonic Converger

No, it's the passive. Maybe it's the simulation program, I use Switchercad 3. Seems strange though, that it could be the cause for the differences. Do you use ideal components in the simulation? Variations in the values can cause the nocth deph to be modified. How high is your peak, how deep your no...
by DSV
12 Aug 2008, 19:09
Forum: Circuit Blocks
Topic: Methods of distortion in stomp boxes
Replies: 11
Views: 4461

Re: Methods of distortion in stomp boxes

I think there is no 'best' method of distortion. As soulsonic said, some are easier to implement, in example JFETs. Others, like OpAmps with clipping diodes, are more consistent (that's why I prefer them). But IMHO every distortion sound can be created through the combination of: - a pre-equalizer, ...
by DSV
12 Aug 2008, 17:14
Forum: Boutique Stompboxes dissected...
Topic: Hadley - Harmonic Converger
Replies: 130
Views: 29185

Re: Hadley - Harmonic Converger

Yep, the second curves are the phase shift. It is possible to make both the peak increase and the notch deppen by reducing the 2k2 resistor. Basically replacing it by a potentiometer wired as a variable resistor should do the trick. This will shift the frequency a bit, but it will always remain in t...
by DSV
12 Aug 2008, 11:26
Forum: Boutique Stompboxes dissected...
Topic: Hadley - Harmonic Converger
Replies: 130
Views: 29185

Re: Hadley - Harmonic Converger

Here is another version, without the high frequncy rolloff, both in active (with gyrator) and passive (with inductor) configurations.

Blue curve is for the active circuit, green for the passive one.
by DSV
12 Aug 2008, 10:59
Forum: Boutique Stompboxes dissected...
Topic: Hadley - Harmonic Converger
Replies: 130
Views: 29185

Re: Hadley - Harmonic Converger

Hi all! (1st post here)

My design for bajaman's specs on a passive version, and its frequency response.