TSSA - The Simplest Symmetrical Amplifier

[Lazy Cat]

Originally Posted by Idefixes

Note : 0R22 MPC71 and 2N5486/2N5462 are ordered

Very good, please also order SK75/37,5 four heatsinks. SK75 has two pins for which at least one has to be connected to the GND. Consider it as a el. part on PCB, give them a room, not to touch their neigbours, cause they will be hot.

P.S. ... and the name is Lazy Cat

[Idefixes]

Ultime evolution???

LC, 1mF/10V et 2.2mF/10V will be panasonic FC. Both exist in 10mm diam.

Marc

[Idefixes]

Originally Posted by Lazy Cat

Very good, please also order SK75/37,5 four heatsinks. SK75 has two pins for which at least one has to be connected to the GND. Consider it as a el. part on PCB, give them a room, not to touch their neigbours, cause they will be hot.

P.S. ... and the name is Lazy Cat

Here it is....KSC/KSA was just at the right place....needed any layout modification were necessary to fit SK75 in.

Marc

PS :"s" gone ....replaced by "z"

[Lazy Cat]

Originally Posted by Idefixes

Here it is....KSC/KSA was just at the right place....needed any layout modification were necessary to fit SK75 in.

Marc

PS :"s" gone ....replaced by "z"

WOW , one little sexy PCB, congratulations Marc

[Idefixes]

Originally Posted by Lazy Cat

WOW , one little sexy PCB, congratulations Marc

Thanks....was possible only beacause your help....when i see first version, i mesure the road to the final one.

Thanks a lot, yet i must go for bom and purchase. With single side i can easy do it at home on standart PCB board 160x140. Just a "last" advice...: i have on hand 4x 22.000µf 63v screw caps chemi-con U32D. Will that be enough for two channel or should i add 2x10.000 per board or 2x 22.000 U32D per bord for smoothing?

Marc

[Lazy Cat]

Originally Posted by Idefixes

Thanks....was possible only beacause your help....when i see first version, i mesure the road to the final one.

Thanks a lot, yet i must go for bom and purchase. With single side i can easy do it at home on standart PCB board 160x140. Just a "last" advice...: i have on hand 4x 22.000µf 63v screw caps chemi-con U32D. Will that be enough for two channel or should i add 2x10.000 per board or 2x 22.000 U32D per bord for smoothing?

Marc

Nature of the forum is to make things together, faster, in a boost like way. Some designs are successful, some so much that goes to commercial production and sold on ebay by third parties, etc.

4 x 22 mF/63 V is more than enough for two channels at +/-50 V, of course all depends on your's speaker impedance, but for 4 ohm would be OK. I suggest to make the amp as dual mono normally if you have two separate transformers.

The PCB looks really great and I have to inform you that there will be some three resistors more on it, I will draw it and explain why. Don't worry nothing special but now is the time and will give us much easier job later.

[Idefixes]

Originally Posted by Lazy Cat

4 x 22 mF/63 V is more than enough for two channels at +/-50 V, of course all depends on your's speaker impedance, but for 4 ohm would be OK. I suggest to make the amp as dual mono normally if you have two separate transformers.

I think i have enough transformers (500Va 2x36Vac) for dual mono .... take a look picture under



Don't know what futur is made from so i think to had 2x10000µf per board.

Originally Posted by Lazy Cat

The PCB looks really great and I have to inform you that there will be some three resistors more on it, I will draw it and explain why. Don't worry nothing special but now is the time and will give us much easier job later.

I have been waiting for modification

Marc

[Salas]

Why you put that remote ''on'' thing? Is it for home theater installations? And how can we skip it locally on board? Maybe better include a 3 way small switch that provides +12V (on), 0V (mute), remote, positions?

[Lazy Cat]

This update enables TSSA BIGBT HP to be even more universal:
- serial diode MUR160 plus 22 ohm resistor in power supply rails helps to improve PSRR
- +/-OPT pins enables to connect separate power supply for the front-end (MUR160 and 22 ohm are omitted)
- power supply LED indicators for both front-end and output stage are present
- serial compensating resistor added to NTC (serves to calibrate NTC thermal response)
- serial resistors added to SK75 heatsink's GND connection (serial RC filter)
- 1 uF/63V decoupling capacitors added close to VAS transistors supply rails
- TLP627 input now accepts 12 V remote signal (serial resistor added)
- LT1034 replaced by TL431
- R2-R9 values stated for +/-50 V power supply rails

And that's about it.

[Lazy Cat]

Originally Posted by Salas

Why you put that remote ''on'' thing? Is it for home theater installations? And how can we skip it locally on board? Maybe better include a 3 way small switch that provides +12V (on), 0V (mute), remote, positions?

Hi Salas

No, TLP627 serves to switch output transistors on/off, practically replaces an output relay.