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Chip Amps Amplifiers based on integrated circuits

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Old 21st September 2019, 01:40 AM   #161
rabbitz is offline rabbitz  Australia
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The 0R1 resistors reduce high order harmonics from the rectifier and mains and the DC waveform is much cleaner (quoted from source).

Chris

I've added a schematic of the power supply to clarify my comment. You wanted to use the FC closest to the transformer, so they would be C1, C2 and the FW would be C3, C4, C5, C6.

I'm only an amp builder and have picked up this stuff over the decades but I do not pretend to understand it. Hugh Dean (AKSA) has tried to explain this stuff to me but it just shoots over my head. My expertise is in speaker design and build.
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File Type: jpg RZ_Baksa_powersupply_sch.jpg (165.1 KB, 176 views)
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Old 21st September 2019, 10:14 AM   #162
chermann is offline chermann  Austria
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Thanks rabbitz for clarifying and sharing.
I really appreciate your help
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Old 26th September 2019, 11:10 AM   #163
chermann is offline chermann  Austria
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Hi again

Actually my time schedule for DIY audio is not very good...actually i am busy.....

i send you a pic (evening) from the cap bank update according to rabbitz idea. done by my son under my advises

chris
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Old 26th September 2019, 07:23 PM   #164
chermann is offline chermann  Austria
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Default not ready...

Hi


as promised..pics from the dual supply with 1 cap bank. the blue caps in the middle will be connected to the rectifiers +/- pole. the gold caps are for each amps and each side i get the +25V - 0 - -25V. i plan to solder the wires under the pcb red-black-blue on each side
R = 0,2R/5W...from my stock..


chris
Attached Images
File Type: jpg 1875_psu dual supply_1.jpg (124.5 KB, 117 views)
File Type: jpg 1875_psu dual supply_2.jpg (131.6 KB, 117 views)
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Old 26th September 2019, 07:38 PM   #165
chermann is offline chermann  Austria
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Hi


i have on hand a KBPC604. so its rated for 400V and 4Amps..but i am sure its too small = 4 Amps is too less current..

https://www.vishay.com/docs/93585/vs-kbpc1series.pdf
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Old 27th September 2019, 02:25 AM   #166
rabbitz is offline rabbitz  Australia
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ESP recommends a 10A minimum bridge rectifier. I used 35A on my 120VA 18-0-18 transformer but I did use a 6A on my small 20VA 15-0-15 transformer supply but did add a heatsink to it in case. It never got warm during tests.
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Old 27th September 2019, 02:30 AM   #167
rabbitz is offline rabbitz  Australia
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Quote:
Originally Posted by chermann View Post
Hi


as promised..pics from the dual supply with 1 cap bank. the blue caps in the middle will be connected to the rectifiers +/- pole. the gold caps are for each amps and each side i get the +25V - 0 - -25V. i plan to solder the wires under the pcb red-black-blue on each side
R = 0,2R/5W...from my stock..


chris
Looks good. Don't forget the transformer CT has to go in at the centre blue caps.
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Old 27th September 2019, 05:42 AM   #168
chermann is offline chermann  Austria
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Quote:
Originally Posted by rabbitz View Post
ESP recommends a 10A minimum bridge rectifier. I used 35A on my 120VA 18-0-18 transformer but I did use a 6A on my small 20VA 15-0-15 transformer supply but did add a heatsink to it in case. It never got warm during tests.
Thanks rabbitz - i am looking for one phase 10A rectifier
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Old 27th September 2019, 05:42 AM   #169
chermann is offline chermann  Austria
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Quote:
Originally Posted by rabbitz View Post
Looks good. Don't forget the transformer CT has to go in at the centre blue caps.
yep Sir !
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Old 28th September 2019, 06:22 PM   #170
chermann is offline chermann  Austria
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Default small step forward

Good evening


here some pics from a small step forward.


transformer mounted, speaker terminal, rca terminal, power socket with switch,
rectifier mounted
the rectifier is a diotech KBPC 2504....25A version with alu bottom plate- it was the only version which was today available
my cap board gets 2 leds = red for +25V and yellow for the -25V


chris
Attached Images
File Type: jpg 1875amp rectifier 25A.jpg (71.7 KB, 74 views)
File Type: jpg 1875amp installation step 1.jpg (150.8 KB, 72 views)
File Type: jpg 1875amp back.jpg (107.3 KB, 41 views)
File Type: jpg 1875amp psu with Leds_1.jpg (90.7 KB, 37 views)
File Type: jpg 1875amp psu with Leds_2.jpg (96.9 KB, 33 views)
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