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Very simple quasi complimentary MOSFET amplifier
Very simple quasi complimentary MOSFET amplifier
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Old 5th March 2019, 10:13 AM   #2451
AKSA is offline AKSA  Australia
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Marc,

Please wait a couple of days while I study your layout. I do this in my morning café but I need a clear head. I have just lost a old, dear friend and I'm very tired at present after a couple of weeks after high temperatures, the weather his year is not good in Oz.

Hugh
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Old 5th March 2019, 12:49 PM   #2452
bandol83 is offline bandol83  France
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Hello Hugh,

Don't worry, I have a lot of time since I am half retired...

I am sorry to hear that you lost your good friend. I wish all the best for you and hopefully the summer will be soon finished in Australia !

Cheers,
Marc
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Old 7th March 2019, 09:35 AM   #2453
AKSA is offline AKSA  Australia
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Marc,

I have some information on your circuit. I have discussed it with a good friend as well and we have some agreement on how you should proceed. Don't send off your pcb for manufacture just yet!!

Please email me at aspen01 -at- optusnet.com.au and we will chat on email about your circuit.

Hugh
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Old 7th March 2019, 11:54 AM   #2454
bandol83 is offline bandol83  France
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Thanks Hugh, I have send the mail

Cheers,
Marc
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Old 19th March 2019, 11:38 AM   #2455
Dacz is offline Dacz  Philippines
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any news about the hybrid amplifier
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Old 19th March 2019, 12:02 PM   #2456
bandol83 is offline bandol83  France
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Dacz,

After several mails exchange with Hugh, we found that there could be several options depending of the MOSFET used in the driver stage, therefore I have designed two PCB versions to test them...

The rev. 5 is the original version but with a Depletion MOSFET and different possibilities of capacitors / resistors mounting while the Rev. 5HD is Hugh Dean variation with a enhancement MOSFET and a Mu-follower stage.

I am waiting for the PCB to test them

Rgds,
Marc
Attached Images
File Type: png PCB Hybrid amplifier Rev.5.png (155.0 KB, 146 views)
File Type: png PCB Hybrid amplifier Rev.5HD.png (141.0 KB, 143 views)
Attached Files
File Type: pdf Schema Hybrid amplifier Rev.5.pdf (143.9 KB, 35 views)
File Type: pdf Schema Hybrid amplifier Rev.5HD.pdf (141.0 KB, 34 views)
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Old 19th March 2019, 01:14 PM   #2457
Dacz is offline Dacz  Philippines
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hi marc,

waiting for your build. I think it is much better if you start a new thread for this hybrid amp.

regards,
dacz
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Old 19th March 2019, 01:35 PM   #2458
bandol83 is offline bandol83  France
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Hi Dacz,

You are right

I will start a new thread for the Hybrid amplifier...

Rgds,
Marc
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Old 19th March 2019, 01:41 PM   #2459
avtech23 is offline avtech23  Australia
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Very simple quasi complimentary MOSFET amplifier
Looks good, I'd be interested in hearing how the tests go.

Are the Fets unobtainium - Do you have a source figured out for them yet?
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