Davidoff Library

Free online ressources on guitars, amps, effects, guitar technique and more. Dedicated to the fond memory of its founder SPeter Davidoff.

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YERASOV schematics

Last post by GodSaveMetal « 12 Feb 2016, 21:35
Replies: 23
by modman » 14 Jan 2008, 19:28
1

2
Rating: 1.1%

Morecowbell, thanks for those great links you posted, but if they are all avaible from one location, it's better to just post that one link. If people are interested in discussion about this or that box, that can become a separate thread.

They are all in the $59-159 price range! Anybody has more info on this brand, we're still waiting for the english version of the website..
23 Replies

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View the latest post Re: YERASOV schematics
Last post GodSaveMetal
12 Feb 2016, 21:35
NOBELS schematics

Last post by mozwell « 15 Dec 2010, 03:56
Replies: 2
by Sock Puppet » 03 Dec 2007, 18:50

For free, from their site:

S.

2 Replies

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Last post mozwell
15 Dec 2010, 03:56

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Ken Lang, Guitar Sound Intensifier, Popular Electronics, July 1974 🇺🇸

Last post by Ben N « 14 Feb 2022, 17:08
Replies: 1
by modman » 13 Feb 2022, 20:57

Rating: 1.3%

Full article PDF:
Poptronics-1974-07 Guitar Sound Intensifier.pdf

Poptronics-1974-07 Guitar Sound Intensifier 01.jpg Poptronics-1974-07 Guitar Sound Intensifier 02.jpg

1 Replies

494 Views

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Last post Ben N
14 Feb 2022, 17:08
J.S. Simonton, Build the Waa-Waa, Popular Electronics, Jan 1970 🇺🇸

Last post by modman « 12 Feb 2022, 17:07
Replies: 1
by modman » 25 Dec 2020, 14:50

Rating: 1.1%

1970_01 Popular Electronics WaaWaa.pdf
Poptronics-1970-01-OCR-Page-0001.jpg

1 Replies

1684 Views

View the latest post Pédale Waa-Waa pour guitare, …
Last post modman
12 Feb 2022, 17:07
R. A. Penfold, Sustain Unit, in: Practical Electronics, May 1984 🇬🇧

Last post by modman « 12 Feb 2022, 15:47

by modman » 12 Feb 2022, 15:47

Rating: 0.4%

PDF: Practical-Electronics-1984-05 Penfold Sustain Unit.pdf

Practical-Electronics-1984-05 Penfold Sustain Unit 01.jpg Practical-Electronics-1984-05 Penfold Sustain Unit 02.jpg Practical-Electronics-1984-05 Penfold Sustain Unit 03.jpg Practical-Electronics-1984-05 Penfold Sustain Unit 04.jpg

0 Replies

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View the latest post R. A. Penfold, Sustain Unit, …
Last post modman
12 Feb 2022, 15:47
Fuzzder FS-1, Haut-Parleur, September 1970 🇫🇷

Last post by phatt « 11 Feb 2022, 13:55
Replies: 1
by modman » 08 Feb 2022, 19:48

Rating: 1.7%

PDF: HAut Parleur 1970 Fuzzder.pdf

HAut Parleur 1970 Fuzzder.jpg

1 Replies

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Last post phatt
11 Feb 2022, 13:55
Distorsion Booster, in: Haut Parleur, July 1988 🇫🇷

Last post by phatt « 11 Feb 2022, 13:50
Replies: 1
by modman » 11 Feb 2022, 00:01

Rating: 1.1%

PDF: Le HAUT-PARLEUR n°1754 - Juillet 1988 Distortion Booster.pdf

Le HAUT-PARLEUR n°1754 - Juillet 1988 Distortion Booster 02.jpg Le HAUT-PARLEUR n°1754 - Juillet 1988 Distortion Booster 03.jpg

1 Replies

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Last post phatt
11 Feb 2022, 13:50
S. Sharpes, Fuzz Circuit, Practical Electronics, December 1970 🇬🇧

Last post by nightraven « 10 Feb 2022, 21:52
Replies: 3
by modman » 08 Feb 2022, 19:59

Rating: 1.7%

PDF: Practical-Electronics-1970-12 Fuzz .pdf

Practical-Electronics-1970-12 Fuzz .jpg

3 Replies

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Last post nightraven
10 Feb 2022, 21:52
60W EL34 tube amp, in: Quattrocose, February 1967 🇮🇹

Last post by Guilherme « 08 Feb 2022, 12:30
Replies: 4
by modman » 14 Apr 2021, 09:30

Rating: 1.1%

Complete article in pdf: Quattrocose 1967_02.pdf

Quattrocose 1967_02 04.jpg
Quattrocose 1967_02 03.jpg
Quattrocose 1967_02 bom.jpg

4 Replies

1012 Views

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Last post Guilherme
08 Feb 2022, 12:30
Pédale Waa-Waa, in: Haut-Parleur, July 1973 🇫🇷

Last post by BMS1971 « 07 Feb 2022, 13:21
Replies: 1
by modman » 07 Feb 2022, 12:16

A wah pedal that has a manual and an auto mode setting?

Complete article in PDF: Le HAUT-PARLEUR n°1414 19 Juillet 1973 Waa Waa.pdf

Le HAUT-PARLEUR n°1414 19 Juillet 1973 Waa Waa 01.jpg Le HAUT-PARLEUR n°1414 19 Juillet 1973 Waa Waa 02.jpg Le HAUT-PARLEUR n°1414 19 Juillet 1973 Waa Waa 03.jpg

1 Replies

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Last post BMS1971
07 Feb 2022, 13:21
Three Germanium Fuzz Circuits, in: Construire diverte, April 1967 🇮🇪

Last post by BMS1971 « 02 Feb 2022, 13:45
Replies: 2
by modman » 02 Feb 2022, 12:44

Rating: 1.9%

Full article in PDF: Costruire diverte 1967_04 Distorsore Vox.pdf

Screen Shot 2022-01-23 at 23.58.12.png
Costruire diverte 1967_04 Distorsore Transistus Primo.jpeg Costruire diverte 1967_04 Distorsore Transistus Secondo.jpeg

2 Replies

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Last post BMS1971
02 Feb 2022, 13:45
Switchmode Power Supply Handbook

Last post by bumblebee « 02 Feb 2022, 00:24
Replies: 7
by SPeter » 12 Jan 2011, 19:27

Rating: 2.2%

To whom it may concern!

Product Description: The definitive guide to switchmode power supply design--fully updated

Covering the latest developments and techniques, Switchmode Power Supply Handbook, third edition is a thorough revision of the industry-leading resource for power supply designers. New design methods required for powering small, high-performance electronic devices are presented. Based on the authors' decades of experience, the book is filled with real-world solutions and many...

7 Replies

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Last post bumblebee
02 Feb 2022, 00:24
Oscar Tartaglia, La chitarra con il fuzz, Radio Elettronica, May 1978 🇮🇪

Last post by ppluis0 « 20 Jan 2022, 20:20
Replies: 5
by modman » 19 Jan 2022, 13:24

Rating: 2.6%

Fuzz unit with treble/bass tone control using two 741 opamps.
Full article in PDF: Radio Elettronica 1978_05 Double 741 Distortion.pdf

Radio Elettronica 1978_05 Double 741 Distortion 02.jpg
Radio Elettronica 1978_05 Double 741 Distortion 03.jpg Radio Elettronica 1978_05 Double 741 Distortion 04.jpg Radio Elettronica 1978_05 Double 741 Distortion 05.jpg Radio Elettronica 1978_05 Double 741 Distortion 06.jpg

5 Replies

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Last post ppluis0
20 Jan 2022, 20:20
Double Sound Tremolo, Amaterske Radio, October 2004 🇨🇿

Last post by modman « 16 Jan 2022, 18:33

by modman » 16 Jan 2022, 18:33

Rating: 0.9%

PDF: Amaterske Radio 2004-10 Double Tremolo.pdf

Amaterske Radio 2004-10 Double Tremolo 01.jpg
Amaterske Radio 2004-10 Double Tremolo 02.jpg

In Czech, but here is a rough translation from Google:

A tremolo is a circuit that periodically changes the level of a passing signal.
In this case, it is supplemented by a two-position switch, which allows the signal to be corrected by frequency.

Description
The wiring diagram of the tremolo is shown in Fig. 1. The operational amplifier IC1A is...

0 Replies

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View the latest post Double Sound Tremolo, Amater …
Last post modman
16 Jan 2022, 18:33
Helmut Haas, The Influence of a Single Echo on the Audibility of Speech, 1949 (Haas Effect, Precedence Effect)

Last post by mauman « 12 Jan 2022, 19:50

by mauman » 12 Jan 2022, 19:50

Rating: 1.5%

Dissertation by Helmut Haas describing the Haas Effect. It includes a detailed description and diagram of a very early magnetic tape echo generator (magnetophone, a precursor to the Echoplex) that he used in the his experiments. This is the English translation, pubished in the Journal of the Audio Engineering Society.

0 Replies

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View the latest post Helmut Haas, The Influence o …
Last post mauman
12 Jan 2022, 19:50
RCA Fuzz Box, RCA solid state circuits for hobbyists, 1968 🇺🇸

Last post by ppluis0 « 12 Jan 2022, 14:09
Replies: 2
by modman » 02 Jul 2021, 08:57

Rating: 1.3%

PDF 1968: RCA Fuzz Box 1968.pdf
RCA Fuzz 1968 edition 1.jpg RCA Fuzz 1968 edition 2.jpg

1971 edition:
RCA-Hobby-Circuit-Manual-1970 fuzz box 1.jpg RCA-Hobby-Circuit-Manual-1970 fuzz box 2.jpg RCA-Hobby-Circuit-Manual-1970 fuzz box 3.jpg

2 Replies

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Last post ppluis0
12 Jan 2022, 14:09
D.R. Wilder, Phase Shift Vibrato Circuit, filed May 1964 Univibe

Last post by modman « 08 Jan 2022, 22:01
Replies: 1
by analogguru » 26 Jun 2007, 18:09

Rating: 0.4%

Here is a patent concerning the Univibe

Uspat_3418418.pdf

analogguru

1 Replies

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Last post modman
08 Jan 2022, 22:01
J.A. Cook Jr., Transistor Limiter Amplifier Circuit, patent filed Oct 1962

Last post by modman « 08 Jan 2022, 19:50

by modman » 08 Jan 2022, 19:50

Rating: 1.3%

Full Patent Text in PDF: US3223936.pdf

US3223936 Transistor limiter amplifier.jpg

The source for this information is here . I did not discover this, but trying to create some sub text...

The patent being applied for on 23rd of October 1962, and published on the 14th of December 1965, make it a very likely source for the EHX Big Muff circuit:

big-muff-pi-schematic.jpg

0 Replies

498 Views

View the latest post J.A. Cook Jr., Transistor Li …
Last post modman
08 Jan 2022, 19:50
B.H. Bailey, Waa-waa pedal unit for electronic guitar, Practical Electronics, July 1968 🇬🇧

Last post by ppluis0 « 03 Jan 2022, 13:39
Replies: 1
by modman » 03 Jan 2022, 11:51

Rating: 1.3%

PDF: Practical-Electronics-1968-07 Waa Waa.pdf

Practical-Electronics-1968-07 Waa Waa 01.jpg Practical-Electronics-1968-07 Waa Waa 02.jpg Practical-Electronics-1968-07 Waa Waa 03.jpg

1 Replies

550 Views

View the latest post Re: B.H. Bailey, Waa-waa ped …
Last post ppluis0
03 Jan 2022, 13:39
Alan Douglas, Vibrato: electronic and mechanical methods, Practical Electronics, July 1967 🇬🇧

Last post by modman « 30 Dec 2021, 10:58

by modman » 30 Dec 2021, 10:58

Rating: 0.6%

PDF: Practical-Electronics-1967-06 Vibrato.pdf

Practical-Electronics-1967-06 Vibrato 01.jpg Practical-Electronics-1967-06 Vibrato 02.jpg Practical-Electronics-1967-06 Vibrato 03.jpg Practical-Electronics-1967-06 Vibrato 04.jpg

0 Replies

469 Views

View the latest post Alan Douglas, Vibrato: elect …
Last post modman
30 Dec 2021, 10:58
A. Niemiro, Guitar Fuzz-Sustain Unit, Practical Electronics, June 1979 🇬🇧

Last post by Manfred « 29 Dec 2021, 00:32
Replies: 1
by modman » 28 Dec 2021, 13:18

Rating: 1.7%

Practical-Electronics-1979-06-S-OCR-OCR-Page-0070 Fuzz Sustain.jpg

1 Replies

584 Views

View the latest post Re: A. Niemiro, Guitar Fuzz- …
Last post Manfred
29 Dec 2021, 00:32
Compresseur - Booster pour guitar, in: Haut-Parleur, June 1994 🇫🇷

Last post by Manfred « 27 Dec 2021, 06:28
Replies: 3
by modman » 18 Dec 2021, 09:30

Rating: 3%

PDF: HP1824 juin 1994 Compresseur Booster.pdf

HP1824 juin 1994 Compresseur Booster 01.jpg
HP1824 juin 1994 Compresseur Booster 02.jpg

3 Replies

811 Views

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Last post Manfred
27 Dec 2021, 06:28
G. Wareham, Electronic Vibrato Unit, Practical Electronics, February 1966 🇬🇧

Last post by modman « 26 Dec 2021, 11:38
Replies: 1
by modman » 23 Dec 2021, 17:22

Rating: 0.9%

PDF: Practical-Electronics-1966-02 Electronic Vibrato.pdf

Practical-Electronics-1966-02 Electronic Vibrato 01.jpg Practical-Electronics-1966-02 Electronic Vibrato 02.jpg Practical-Electronics-1966-02 Electronic Vibrato 03.jpg
Practical-Electronics-1966-02 Electronic Vibrato.jpg

1 Replies

507 Views

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Last post modman
26 Dec 2021, 11:38
Q.A. Rice, A Simple Compressor, Practical Electronics, February 1977 🇬🇧

Last post by Jarno « 23 Dec 2021, 11:18
Replies: 8
by modman » 13 Dec 2021, 09:51

Rating: 4.3%

Practical-Electronics-1977-02-OCR-Page-0063 simple Compressor.pdf Practical-Electronics-1977-02-OCR-Page-0063 simple Compressor.jpg

8 Replies

1139 Views

View the latest post Re: Q.A. Rice, A Simple Comp …
Last post Jarno
23 Dec 2021, 11:18
Fred B. Maynard, Twin T's Design and Applications, in: Electronics World, August 1968 🇺🇸

Last post by Ben N « 22 Dec 2021, 13:18
Replies: 4
by modman » 21 Dec 2021, 12:07

Rating: 1.7%

English PDF: Electronics-World-1968-08 Twin T's.pdf
French PDF: Le HAUT-PARLEUR n°1201 - 6 Mars 1969 Double T filter 01.pdf

Le HAUT-PARLEUR n°1201 - 6 Mars 1969 Double T filter 01.jpg
Le HAUT-PARLEUR n°1201 - 6 Mars 1969 Double T filter 02.jpg
Le HAUT-PARLEUR n°1201 - 6 Mars 1969 Double T filter 03.jpg Le HAUT-PARLEUR n°1201 - 6 Mars 1969 Double T filter 04.jpg

4 Replies

692 Views

View the latest post Re: Fred B. Maynard, Twin T' …
Last post Ben N
22 Dec 2021, 13:18
B.W. Terrell, Waa Waa, Everyday Electronics, August 1973 🇬🇧

Last post by Jarno « 16 Dec 2021, 21:29
Replies: 4
by modman » 16 Dec 2021, 10:32

Rating: 1.5%

PDF: Everyday-Electronics-1973-08 Waa Waa.pdf

Everyday-Electronics-1973-08 Waa Waa 01.jpg Everyday-Electronics-1973-08 Waa Waa 02.jpg Everyday-Electronics-1973-08 Waa Waa 03.jpg Everyday-Electronics-1973-08 Waa Waa 04.jpg Everyday-Electronics-1973-08 Waa Waa 05.jpg

4 Replies

675 Views

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Last post Jarno
16 Dec 2021, 21:29
A.J. Bassett, Prof. Evermore on the Vox AC30 in: Practical Electronics, 1978-9 🇬🇧

Last post by Manfred « 12 Dec 2021, 03:39
Replies: 1
by modman » 10 Dec 2021, 20:44

Rating: 1.5%

The complete 18 page booklet in PDF: Eversure on Vox AC-30.pdf

A tube amplifier primer taking the Vox AC-30 as an example - but taking it as far as a built-in tube tester?

Eversure on Vox AC-30 01.jpg Eversure on Vox AC-30 2.jpg
Screen Shot 2021-12-11 at 11.12.14.png Screen Shot 2021-12-11 at 11.12.29.png Screen Shot 2021-12-11 at 11.12.45.png Screen Shot 2021-12-11 at 11.13.51.png Screen Shot 2021-12-11 at 11.14.21.png

1 Replies

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Last post Manfred
12 Dec 2021, 03:39

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