peter purpose
Well-known member
This will be the official new design 525 build resource.
I'll add stuff throughout the day.
Biggun http://lazpro.com/525Cschbg.jpg
This version can have a Lundahl LL1540 transformer on the front, or a differential input opamp. If using the opamp (A4)......
A4 bom http://lazpro.com/525A4BOM.txt
The 2520 overlay and bom.....
Biggerer http://lazpro.com/laz2520.jpg
Rs 16 & 17 need] to be 1/2W, the rest 1/4W.
As some BC184C batches seem to be a bit dodgy, use 550C instead.
The switch and meter board.......
The switch resistors need to be miniature types. R9-17 should not protrude through the pcb.
Don't solder in the switch until you offer it into the metalwork, as it sits off the pcb by roughly a mm.
SWMTR bom. http://lazpro.com/SWMTRBOM.txt
The main board...
Main board bom http://lazpro.com/525MAINBOM.txt
I'll add stuff throughout the day.
Biggun http://lazpro.com/525Cschbg.jpg
This version can have a Lundahl LL1540 transformer on the front, or a differential input opamp. If using the opamp (A4)......
A4 bom http://lazpro.com/525A4BOM.txt
The 2520 overlay and bom.....
Biggerer http://lazpro.com/laz2520.jpg
Rs 16 & 17 need] to be 1/2W, the rest 1/4W.
As some BC184C batches seem to be a bit dodgy, use 550C instead.
The switch and meter board.......
The switch resistors need to be miniature types. R9-17 should not protrude through the pcb.
Don't solder in the switch until you offer it into the metalwork, as it sits off the pcb by roughly a mm.
SWMTR bom. http://lazpro.com/SWMTRBOM.txt
The main board...
Main board bom http://lazpro.com/525MAINBOM.txt