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wattaniya 7th January 2012 03:37 PM

Cheshtap Power Amp
1 Attachment(s)
Hi cheshtap,
can u tell me what are the diodes i pointed in the pcb image.
thank u.

wattaniya 7th January 2012 06:06 PM

i found the diode number -HER204,
hard to buy this diode.
any substitute for this diode?

khalsa 8th January 2012 03:55 AM

sir 1n4007

andrewlebon 8th January 2012 09:51 AM

FR 207 FR307

wattaniya 8th January 2012 11:43 AM


Originally Posted by khalsa (
sir 1n4007

khalsa i dont think so in4007 is substitute for her204.
her204 50ns 2a, in4007 1a and lot of difference.

wattaniya 8th January 2012 11:45 AM


Originally Posted by andrewlebon (
FR 207 FR307

thanks andrew.

east electronics 8th January 2012 01:08 PM

is this amplifier actually working ????

----can anyone expect 25amps per rail to pass from such a thin trace ( from fuse holder to the input pin ? )

---- 16 outputs will work without base resistors ?? if so this something i see for the first time ....

---- then again when you built such a big amp distributing the outputs full pcb size from side to side gain space between transistors is the best way to go so heatsink may be able to dissipate heat better and faster ....

there is a few other things ....

HighTec 8th January 2012 03:05 PM


Originally Posted by sakis (

----can anyone expect 25amps per rail to pass from such a thin trace ( from fuse holder to the input pin ? )


Copper braid or copper straps jumpers should be used. The picture shows how Ecler solved this problem in their powerful amps like PAM4100 and PAM6100. The pcb shown is actually from PAM360 but the same solution is used in PAM4100/6100 models. ;)

wattaniya 9th January 2012 11:18 AM

finally i found her204 diode.
the price is us $.1 for each.

mj777 16th January 2012 02:29 PM

chestap amp
hi nazirdigi, how is your chestap amp, did you made it?


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