Pearl AD-08 schematic

Bernardduur · Post by **Bernardduur** » 28 Dec 2007, 16:48

Ok, so during my christmas I had to do something, right? So here is the schematic. Enjoy! Still, need to figure out the potmeters, rest is clear.

Linkie linkie linkie

Dirk_Hendrik · Post by **Dirk_Hendrik** » 28 Dec 2007, 18:03

Bernardduur wrote:Ok, so during my christmas I had to do something, right? So here is the schematic. Enjoy! Still, need to figure out the potmeters, rest is clear.

Linkie linkie linkie

Nice one Rogier!! That's one way to make a christmas usefull! Thanks for sharing!

However, there are some places where I do add questionmarks (That's not bad, wait till AG comes along and nails all your deadspots sharp

), mainly in the delay tome control circuit around the MN3102 as well as the analog filtering before and after the BBD. That said, Pearls are bitches to trace. Swell job!

Bernardduur · Post by **Bernardduur** » 29 Dec 2007, 01:57

Just comment as much as you can

Delays are not the things I usually work on so errors are easy to get!

Chugs · Post by **Chugs** » 16 Apr 2011, 10:50

Anyone have the Pearl AD-08 schematic? The link at the top no longer works.

Dirk_Hendrik · Post by **Dirk_Hendrik** » 16 Apr 2011, 13:05

Classic Bernardduur. Never able to leave something on his site for longer than a few months

See attachment.

Chugs · Post by **Chugs** » 16 Apr 2011, 14:34

Thank you!

Bernardduur · Post by **Bernardduur** » 30 Sep 2012, 10:00

I had some left over time and with the regards of DH I needed to check my schematic.......

And noticed my former trace was off, quite off........ so ignore the former schematics

Bernardduur · Post by **Bernardduur** » 30 Sep 2012, 10:07

Woops, forgot one cap in the feedback path

Bernardduur · Post by **Bernardduur** » 18 Dec 2013, 18:18

Could someone share some light on this?

The FET input buffer keeps blowing up. I've replaced it with all kind of FET's but it breaks every 1 or 2 weeks or so. The result is a very low output signal (both bypass as effect output) that is cured by replacing the FET. I've replaced almost everything in this pedal that should be considered (filter caps, all parts around the FET input, added some protection diodes) but to no avail. I power it by a Dunlop DC-10 that I've been using for all my life! My other pedals have no issues (yet).

Any ideas where to look?

apollomusicservice · Post by **apollomusicservice** » 18 Dec 2013, 18:33

Isn't it the first transistor 2SC2240, not fet?

Bernardduur · Post by **Bernardduur** » 18 Dec 2013, 19:15

apollomusicservice wrote:Isn't it the first transistor 2SC2240, not fet?

That transistor is the output buffer's transistor, the FET is the 2SK105

apollomusicservice · Post by **apollomusicservice** » 18 Dec 2013, 19:34

Try with with 2SC2240 as Q1 (colector to V+, emiter to R58, base to R1 and reduce to 1K).
Necessarily connect sleeve to ground, you don't have drawn on schematic.

Bernardduur · Post by **Bernardduur** » 03 Feb 2014, 20:02

Sure it works, still, I figure why the FET would break.

Anyone has an idea on why this is happening???