Search found 6 matches

by Davy Boy Smith
30 Nov 2011, 06:11
Forum: Modern Stompbox Effects (1975 - ...)
Topic: EHX - Attack Decay 5300 [schematic]
Replies: 65
Views: 16458

Re: EH - Attack Decay [schematic]

ok here is original EHX attack decay board with the KAPUTEPALLA layout posted above overlaid in green. http://drse.us/fark/fark_1322628859.jpg and here is the location of the boo boo :slap: http://drse.us/fark/fark_1322629126.jpg Try soldering a wire across that and it should work.(if you did everyt...
by Davy Boy Smith
30 Nov 2011, 05:21
Forum: Boutique Stompboxes dissected...
Topic: Zvex - Fuzz Factory [traced]
Replies: 941
Views: 191375

Re: Zvex - Fuzz Factory [traced]

Definitly found the problem, and it has to do with the hFE of one of the transistors. So I bought these transistors to build a FUZZ FACE because the Ge transistors I bought at the MIT Flea market for 3 bucks did not work in the FUZZ FACE circuit. 25 matched pairs of AC128K/AC176K. http://drse.us/far...
by Davy Boy Smith
30 Nov 2011, 04:39
Forum: Boutique Stompboxes dissected...
Topic: Zvex - Fuzz Factory [traced]
Replies: 941
Views: 191375

Re: Zvex - Fuzz Factory [traced]

I think I found the problem, and it has to do with the hFE of one of the transistors. more to follow.

Image
by Davy Boy Smith
29 Nov 2011, 07:34
Forum: Boutique Stompboxes dissected...
Topic: Zvex - Fuzz Factory [traced]
Replies: 941
Views: 191375

Re: Zvex - Fuzz Factory [traced]

Hi, I was wondering if someone can throw me a bone here. I built this and it don't quite sound right. Sounds clippy and cannot adjust to oscillation. My question is this since there are schematics and vero board layouts and 46 pages of dialog on this project and Q1 Q2 and Q3 referenced throughout an...
by Davy Boy Smith
06 Nov 2011, 00:20
Forum: Modern Stompbox Effects (1975 - ...)
Topic: EHX - Attack Decay 5300 [schematic]
Replies: 65
Views: 16458

Re: EH - Attack Decay [schematic]

here it is!No permission to copy or post in other site! I hope nobody has built to this layout and expected it to work. VSS pin on 4066 not connected to ground. I am comparing this artwork to the gutshot of the unit that I repaired a while ago. :roll: I will post the Pictures when my server is back...
by Davy Boy Smith
02 Nov 2011, 13:07
Forum: Davidoff Library
Topic: OpAmps for Everyone - Book
Replies: 2
Views: 3302

Re: OpAmps for Everyone - Book

Texas Instruments hosts this on their site. Not sure if it's the same book, why wait for download? http://www.ti.com/lit/an/slod006b/slod006b.pdf then there is National... http://www.national.com/an/AN/AN-31.pdf lest we forget Analog Devices http://www.analog.com/library/analogDialogue/archives/39-0...