The original schematics posted by Mr. Pass on the first page ( https://www.diyaudio.com/forums/att...-ab100-class-ab-power-amplifier-ab100-001-gif ) shows 221 for R35.
Correct schematic for Prasi pcb
Hey @flamethrower1 , here is the last schematic from Prasi , that should be used with his boards . It has the R3 correction of his previous schematic @ the correct 1k , not 100e .
Post 11234 of this thread : AB100 Class AB Power Amplifier
Values are correct for all Prasi boards . The schematic just indicates 2x big caps per rail compared to the 1x cap per rail version
Well shucks, looks like I get to try my unwelding techniques, glad they are somewhat isolated
Hey @flamethrower1 , here is the last schematic from Prasi , that should be used with his boards . It has the R3 correction of his previous schematic @ the correct 1k , not 100e .
Post 11234 of this thread : AB100 Class AB Power Amplifier
Values are correct for all Prasi boards . The schematic just indicates 2x big caps per rail compared to the 1x cap per rail version
ab100
Well, since I had to order another resistor, I did not totally finish my boards.
They are however close enough to take the chassis apart cut some ventilation holes and get this out to be anodized.
This project involved a butt load of soldering, good practice anyway.
Well, since I had to order another resistor, I did not totally finish my boards.
They are however close enough to take the chassis apart cut some ventilation holes and get this out to be anodized.
This project involved a butt load of soldering, good practice anyway.
Attachments
Can we get away with a 2W power resistors for 1R as I have good quality metal oxide ones. I hope it should be fine considering that the bias current is going to be 20mA?
Also the diodes 1N4739 and 1N5408 can they be replaced with other diodes found common 1W types like 1N4742/44 or higher voltage, please let me know.
Thanks
Also the diodes 1N4739 and 1N5408 can they be replaced with other diodes found common 1W types like 1N4742/44 or higher voltage, please let me know.
Thanks
Yes on both countsCan we get away with a 2W power resistors for 1R as I have good quality metal oxide ones. I hope it should be fine considering that the bias current is going to be 20mA?
Also the diodes 1N4739 and 1N5408 can they be replaced with other diodes found common 1W types like 1N4742/44 or higher voltage, please let me know.
Thanks Papa, will use the 2W resistors and also the 1N4742 diodesYes on both counts
Boards look beautiful... (i am yet to familiarize myself with new diyaudio software, I don't know how this will be posted)
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