BH 420 bass amp; Help making a pcb layout

chicago_mike · Post by **chicago_mike** » 31 May 2012, 15:02

Reviving an old thread:

I'll be posting picies of the Thunderfunk 750 head in a little bit. The new big brother to the BH420.

Duckman · Post by **Duckman** » 31 May 2012, 17:44

Interesting. How different are they?

chicago_mike · Post by **chicago_mike** » 31 May 2012, 20:07

Not very. A cleaner layout, more caps...some modernized stuff..Ill post them in a little bit here.

chicago_mike · Post by **chicago_mike** » 31 May 2012, 20:19

Phone pics..schematics and pcb and transformer

Starting now..

Duckman · Post by **Duckman** » 01 Jun 2012, 00:38

Do it! Hey... wait a minute... will be a puzzle?

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:13

A big frikkin puzzle!!!!!

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:15

These are NOT in order. I'm too busy today with other stuff to really do that. I will get much better piccies of the preamp traces though. and cap values.

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:17

I think 3 pictures per post is good...I dont know the file size limit per post..

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:24

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:33

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:39

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 13:44

I have to take a pause for the cause, but I am thinking I should just put these in a zip file.

I need to take more pictures any hoo.

I want to build the preamp.

Duckman · Post by **Duckman** » 01 Jun 2012, 16:37

chicago_mike wrote:A big frikkin puzzle!!!!!

I like puzzles!
You're right. A zipped file should help for pictures, but a well scanned schemo would be the most appreciated

Maybe you should you start a new thread for the 750

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 19:30

I thought about that... a new thread.

what I don't have access to, is the preamp schematic, unless I can actually get that...pure luck if I can.

anyways, yeah, I need to finish a few things then I can post more piccies.

I crazy enough to build the preamp and maybe try a diy class D output??

chicago_mike · Post by **chicago_mike** » 08 Jun 2012, 22:54

Hang on!!!

MODS!!!!! Please Read!!

I wish to start a new Clean thread on this amp and its brothers...

I'll start the new thread this weekend. Maybe we can merge after that??

chicago_mike · Post by **chicago_mike** » 02 Jul 2012, 20:13

Guts of an AMP BH 420...

and LOOK!!!! the output board is......ahh...you all know by now.