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Old 18th December 2012, 12:49 PM   #101
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Quote:
Originally Posted by Lazy Cat View Post
No, no, standard parts on 50 x 80 mm PCB, only that I will use these output mosfets, ordered four.
Why 4? did plan to use more than one per chanel???

Will be 8A devices to drive 4 to 5ohms min speakers at +/-35VDC rails?

Marc
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Last edited by Idefixes; 18th December 2012 at 12:57 PM.
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Old 18th December 2012, 01:33 PM   #102
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Quote:
Originally Posted by Idefixes View Post
Why 4? did plan to use more than one per chanel???

Will be 8A devices to drive 4 to 5ohms min speakers at +/-35VDC rails?

Marc
One ALF08NP16V5 per channel. Look it is simple, for Id=8A you need Vgs=6V, so at +/-38V PSU you get +/-32Vp on the output and that is 8Ap current. This device can do 8A continuos current within SOAR. So perfectly OK for one ALF08NP16V5 to drive 4 ohm at +/38V rails potential and you get out 128Wmax/4 ohm.
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Old 18th December 2012, 01:37 PM   #103
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Quote:
Originally Posted by Lazy Cat View Post
One ALF08NP16V5 per channel. Look it is simple, for Id=8A you need Vgs=6V, so at +/-38V PSU you get +/-32Vp on the output and that is 8Ap current. This device can do 8A continuos current within SOAR. So perfectly OK for one ALF08NP16V5 to drive 4 ohm at +/38V rails potential and you get out 128Wmax/4 ohm.
Who very interesting....i think i have little home work on eagle this evening...

Marc
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Old 18th December 2012, 02:04 PM   #104
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Look Marc here's VSSA PCB preliminary. All three transistors to main heatsink, TO-126 will have 2 mm ceramic insulators, so very little capacitance to main heatsink (GND) and still enough heat dissipation. PCB fixed with these three screws only, each 2,2 mF/40V replaced with two 1mF/50V, etc. So you can get an idea ...
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Old 18th December 2012, 02:13 PM   #105
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Quote:
Originally Posted by Lazy Cat View Post
Look Marc here's VSSA PCB preliminary. All three transistors to main heatsink, TO-126 will have 2 mm ceramic insulators, so very little capacitance to main heatsink (GND) and still enough heat dissipation. PCB fixed with these three screws only, each 2,2 mF/40V replaced with two 1mF/50V, etc. So you can get an idea ...
Rhaaa lovely....will play with that if allow.

Marc
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Old 18th December 2012, 02:26 PM   #106
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Originally Posted by tinitus View Post
cool looking little amp maybe time to go build that active speaker
Yes, VSSA PCB will be perfectly suitable for that purpose, just wait a little.
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Old 18th December 2012, 07:19 PM   #107
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hi Lazy Cat
Can you do symmetric 50V version ?
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Old 18th December 2012, 07:46 PM   #108
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ALF08NP16V5 board try : 75x66mm
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Old 18th December 2012, 08:47 PM   #109
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Sonny.. Regarding the tendency for the VAS to run thermally away, I have seen that a thermistor across the 470 Ohm rail resister can balance that out. I have currently two amplifiers playing, one bare stripped to simplest basic (like this) and one with everything. CCS's mirror's hawksford-casodes (input and VAS/Driver). Have not yet heard them in the same setup, but sometime during January I will... But first I need to cut some diamond for the CES.
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Old 18th December 2012, 09:24 PM   #110
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Quote:
Originally Posted by Idefixes View Post
ALF08NP16V5 board try : 75x66mm
Very good.

It will take me some more time but will do it anyway.
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