VSSA Lateral MosFet Amplifier

[pergo]

i don't like fuses after capacitors.

[Lazy Cat]

Originally Posted by alex mm

...... new PCB rev2.0 , I can't stay to do nothing
Happy New Year !
Alex.

Thanks Alex, you're true DIY

Happy New Year and many successful project for you too.

P.S. ALF08N16(20)V & ALF08P16(20)V perfectly fits to this PCB too.

[Lazy Cat]

Originally Posted by pergo

i don't like fuses after capacitors.

There are more capacitors after fuses.

Besides these are Time Lag fuses with better conductive characteristics than Fast ones.

[Lazy Cat]

Originally Posted by MiiB

Alex.. nice.. but how to trim offset..??

Trimmers first, than measure, resistors in final.

[pergo]

i was referring at Alex's pcb, where the output mosfets are connected directly with the fuses

It has Vrail --> caps --> fuse --> mosfet

Typical super-SQ-guru ( ) wants:
Vrail --> fuse --> caps --> mosfet

[Lazy Cat]

Today I did listen to VSSA one channel and I have to say it has a potential.

Because I have installed VAS transistors on the main heatsink I had to use ref zener as bias spreader and it works, 100 mA bias for the outputs is completely stable. VAS bias goes from 10 mA (cold start) to 15 mA working conditions and stayed stable also on small heatsink as it is.

Measured output impedance and it is negative: at 4 Vrms unloaded I got 4,05 Vrms loaded with 4 ohm resistor.
Tomorrow I'll do it again, probably the positive probe was too close to sources pin of the output mosfets and I measured also voltage drop on that lead.

Otherwise it worked fluently.

[Lazy Cat]

Originally Posted by pergo

i was referring at Alex's pcb, where the output mosfets are connected directly with the fuses

It has Vrail --> caps --> fuse --> mosfet

Typical super-SQ-guru ( ) wants:
Vrail --> fuse --> caps --> mosfet

There are 1 uF capacitors after fuses on Alex's PCB 2.0

[pergo]

with a little mod you can easy have 1101uF
Only a picky advice

[Lazy Cat]

Originally Posted by pergo

with a little mod you can easy have 1101uF
Only a picky advice

You mean like in schs from my signature's links?

But I didn't want to put more than 1 uF after fuses here in VSSA, made on purpose this way. You don't know why?

[pergo]

are you afraid of the energy stored in the caps in case of shorts?