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Very simple quasi complimentary MOSFET amplifier
Very simple quasi complimentary MOSFET amplifier
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Old 3rd January 2019, 06:48 PM   #2401
manniraj is offline manniraj  India
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I figured from the PSU pic that the R3,R4 are 150K and I can use 1W resistors. But can someone point me to the resistance values to be used for R6 & R7 which are near the rectifiers on the PSU board?

Thanks in advance.
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Old 4th January 2019, 08:38 AM   #2402
boyet0173 is offline boyet0173  Philippines
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Hi Marc,


I received the PCB of Power Supply from the board house. Can you provide the BOM?
Thanks in advance.


Regards,
Boyet
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Old 4th January 2019, 08:46 AM   #2403
avtech23 is offline avtech23  Australia
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Very simple quasi complimentary MOSFET amplifier
Quote:
Originally Posted by manniraj View Post
I figured from the PSU pic that the R3,R4 are 150K and I can use 1W resistors. But can someone point me to the resistance values to be used for R6 & R7 which are near the rectifiers on the PSU board?

Thanks in advance.
Which PSU board are you using?
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Old 4th January 2019, 05:07 PM   #2404
manniraj is offline manniraj  India
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Quote:
Originally Posted by avtech23 View Post
Which PSU board are you using?
It is the same that bandol designed smaller one same size as the amp boards. I got it printed and building it now and need to order the parts. Post # 2310

Thanks
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Old 5th January 2019, 05:08 PM   #2405
bandol83 is offline bandol83  France
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Hi Boyet and manniraj,

There is no BOM for the power supply since the value of the components are dependent of the voltage you are using but I add a schema with the values that I am using

As an exemple for the Quasi with 42 V rail. I am using 4'700 uF 63 V electrolytic capacitor (50 V could be OK), what is important is the size of the capacitors :max 25 mm diameter ! R3 & R4 are bleeders to discharge the capacitors 100k will be OK, lower value will also be possible and will discharge faster but they will consume more in heat

R6 & R7 are high frequency filtering and R5 & R8 are current limiter for the optional LED...

In the meantime I have received the PCB for the DC protection and mounted them, now I must test them and add them to the Quasi to finish it

Rgds,
Marc
Attached Images
File Type: jpg Photo DC protection Jan 5, 2019.JPG (586.0 KB, 283 views)
File Type: jpg Photo DC protection bis Jan 5, 2019.JPG.JPG (640.1 KB, 279 views)
Attached Files
File Type: pdf Schema Power Supply Quasi version 2.pdf (110.5 KB, 53 views)
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Old 5th January 2019, 10:01 PM   #2406
manniraj is offline manniraj  India
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Thanks Marc this helps and I will also be using 30v*4 secondary transformer as yours so should be getting around 42VDC. Using 0.33R 3W resistors instead of 0.22R 3W as I have them readily and as per Aksa they seems to be fine.
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Old 7th January 2019, 12:00 AM   #2407
boyet0173 is offline boyet0173  Philippines
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Thank you very much Marc for parts value of PSU. I also received your Quasi PCB version from the board house.
Good to hear your DC protection. Waiting your review


Regards,
Boyet
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Old 10th January 2019, 10:23 PM   #2408
selwe is offline selwe
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Default PCB ready to buy?

Quote:
Originally Posted by bandol83 View Post
Hi,

The schema and the BOM

Be careful some value indicated on the silkscreen aren't the same than those on the schema or the BOM which are the good one (at least for me). Most are not critical however except for the 1N4148 which replace the red LED.

I have also added the PCB with components picture...

I hope I didn't forget anything.

Bon week-end,
Marc

Hy there,
Is there somewhere we can buy ready made PCBs?
Tnx.
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Old 11th January 2019, 11:59 AM   #2409
endia is offline endia  Turkey
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hi,
first of all thanks to Ranchu32, AKSA, bandol83 and all contributors..

reading the thread for a while and want to build this amp but need some guidance..

i too ordered Marc's pcb design and boards came from pcb house,
thanks a lot Marc..

for R20-R21 (0R33) i found vishay AC03 wirewound 4w resistors in my parts bin, may i use it or it's better to order koa non-inductive ceramic resistors.
which one is preferable sonic wise?

for R23 (10R) i have a few choices;
dale rs-2b wirewound, a metal-oxide one and two more but can't identify them (leftmost and rightmost)..
also maybe i can source allen bradley carbon comps from a local store but not sure will it be stable in there?
which one is better choice?

last but most important; i have dx psu pcbs from my symasm attempt a few years ago. may i use for this amp too?

thanks in advance..
Attached Images
File Type: jpg IMG_20190107_220530.jpg (114.2 KB, 93 views)
File Type: jpg IMG_20190109_221324.jpg (133.7 KB, 89 views)

Last edited by endia; 11th January 2019 at 12:07 PM. Reason: typo
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