TSSA - The Simplest Symmetrical Amplifier

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#1,441
tom42107 said:
I hesitate to post this because I'm not sure if it's good or not. I've included three attachments. One of the Lazy Cat TSSA BJT circuit, second, of my pcb layout with component values and third, my pcb layout without component values. I layed out the pcb's in a program called DIYLayout Creator. I've been using it a lot for simple guitar stompboxes and small power amps. I know that I should just bite the bullet and learn Cadsoft Eagle. I was hoping someone could take a quick look and see where the glaring errors are or if I should just scrap the whole thing and use a better pcb editor. I've seen the layouts that Ales MM and a few other do here and there so good. (Beyond good). I just wanted to etch my own all bjt version of the TSSA and listen to it. You won't hurt my feelings if it stinks.
Tom
Click to expand...


Cute little amp!!
How much power does it produce?
Can it handle 4 ohm?
 
#1,442
I finished my little TSSA BJT amp. There are so few parts I probably could of done it P to P but I've been trying to get better at laying out and making pcb'. It sounds pretty good. I'm using 2SC5200/2SA1943 output trans. My power supply is pretty standard, unregulated, 20,000uF per rail, 200va transformer.
 

Attachments

  • TSSA BJT Scheme.jpg
    TSSA BJT Scheme.jpg
    381 KB · Views: 1,154
  • TSSA BJT.jpg
    TSSA BJT.jpg
    548.5 KB · Views: 1,122
#1,444
Ripcord said:
I finished my little TSSA BJT amp. There are so few parts I probably could of done it P to P but I've been trying to get better at laying out and making pcb'. It sounds pretty good. I'm using 2SC5200/2SA1943 output trans. My power supply is pretty standard, unregulated, 20,000uF per rail, 200va transformer.
Click to expand...

Nice built Ripcord :up:

Yes the circuit completely correspond with its acronym The Simplest Symmetrical Amplifier and this simple schematic is the base ground to all VSSA and later circuits based on this schematics. Its so stable behaviour makes it perfect to evolve to more complex and powerful designs.

Congratulations :cheers:
 
#1,445
Thanks to you Lazy Cat. The Hexfet version is in my future. To maouna, I wish I could tell you about all the technical aspects of this amp but I'm still a novice. I just really love building little power amps. The way I set it up was probably totally wrong but I just matched up the resistances on the two 500 ohm pots until it sounded good to me. It was around 350 ohms. I 'd love it if someone could tell me the procedure for checking bias and setting the pots.Thanks.
 
#1,447
Ripcord said:
I just really love building little power amps. The way I set it up was probably totally wrong but I just matched up the resistances on the two 500 ohm pots until it sounded good to me.
Click to expand...

😎

You're probably close with trimmers, but the purpose of these two trimmers is to set proper DC quiescent current for the output transistors and at the same time to have 0 V output DC offset.

I would definitely recommend to use the lateral mosfet outputs, less problems with thermal stability in TSSA circuit and much easier drive for the input pair. But it is good to know that even with bipolars TSSA sings. 😎
 
#1,457
platon.rado said:
Anyway amplifier is not working properly ...problem with bias current.Give a scheme with a voltage.. moment.

Thank you for the correction image.
Click to expand...

Have you search in the topic : LC given a TSSA Schematic with the first parts to built in with the backround to test CCS. These can not IMO been functionnal with 2N5486/5462 mistake.

I join you LC schematic. I solder all these parts on my board but never does the test...this should shown me that 2N Jfet are wrong on my layout...

Marc
 

Attachments

  • TSSA_BIGBT_HP_sch START.PNG
    TSSA_BIGBT_HP_sch START.PNG
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