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Mirand TSSA V4 and V8 Lateral mosfet amp
Mirand TSSA V4 and V8 Lateral mosfet amp
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Old 12th June 2015, 08:53 AM   #11
sonnya is offline sonnya  Denmark
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Fully assembled boardClick the image to open in full size.


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Old 12th June 2015, 09:02 AM   #12
Myint67 is offline Myint67  Singapore
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Nice
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Old 12th June 2015, 10:05 AM   #13
Catal is offline Catal  Italy
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Wonderful ...
I don't resist, It must be mine! :-)

Can I add myself to the list?

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Old 12th June 2015, 10:05 AM   #14
sonnya is offline sonnya  Denmark
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Yes you can


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Old 12th June 2015, 10:24 AM   #15
Catal is offline Catal  Italy
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Early bird TSSA V4:

Myint67 TSSA v4 x 4 modules
Vitalica TSSA v4 x 2 modules (Paid)
rogerchou TSSA V4 x 2 modules (Paid)
hop.sing TSSA V4 x 2 modules (Paid)
Pinnocchio TSSA V4 x 2 modules
Sperrey TSSA V4 x 6 modules
Catal TSSA V4 x 2 modules

Frank
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Old 12th June 2015, 01:39 PM   #16
sonnya is offline sonnya  Denmark
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Ready to mount on the heatsink. Easy to trim! easier than expected...
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Old 12th June 2015, 07:28 PM   #17
sonnya is offline sonnya  Denmark
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It is easy to set at 50mA - 75mA per device. 200 - 300mA idle In total.



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Old 12th June 2015, 08:52 PM   #18
sonnya is offline sonnya  Denmark
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Click the image to open in full size.

It works well with a test supply of 32V at the moment. Heatsink is 42 celcius small heatsink is 53 celcius so they will most likely go from 25 to 35mm height.

Tomorrow we will raise voltage to about 42V .

Main heatsink is by the Way an SK56 In 75mm height.


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Old 15th June 2015, 10:51 AM   #19
sonnya is offline sonnya  Denmark
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Sorry for my absence, but the frontend need a small tweak to work as i wanted it to.

I have attached screen shots from the scope.

The frontend work with 2x gain. Second stage works with 11x gain for V4/V8.

The frontend screenshot is record at 200KHz.

So we will continue assembling the amps now. As this goes on i will upload some more pictures with low ohm load behavior.
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File Type: png tssa_v4_complete.png (21.7 KB, 432 views)
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Old 15th June 2015, 12:56 PM   #20
sonnya is offline sonnya  Denmark
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We have done some power measurement on a 500VA potted noratel toroid with 2x35VAC secondary windings. 4x15.000uF:

Idle: +/-50VDC

8R +/-50VDC : 120Watt
4R +/-48VDC : 200Watt
2R +/-43VDC : 300Watt (PSU voltage fall when load current is increased) approx 13Vpeak drop into 2Ohm load.

Current limit into an 0.5Ohm load: 36Apeak.

Small signal bandwidth : 1MHz.

Input impedance : 10K
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