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.
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Nice built Ripcord
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
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.
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.
2N5486 is poorly marked,scheme is ok,G should be connected to the emitter.
An externally hosted image should be here but it was not working when we last tested it.
As I remember this PCB was designed by Idefixes. I think Marc connected gate correctly, but please post sch and I can comment.
And what? i know perfectly this schematic; the issue is in the pin assignation in 2N5462/5486 eagle lib. I correct it and and the layout therefore.
Marc
An externally hosted image should be here but it was not working when we last tested it.
bias 10mA,at these voltages.
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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
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Give another time your mail that i send you modified layout...but as i never built it and test complitly be award and check another time my work
Marc
