TSSA - The Simplest Symmetrical Amplifier

[mikelm]

Zout = 0.49Ohm

So I won't add an o/p resistor

 

[maxlorenz]

Thank you Sonny...I was hesitating because I don't know the sense of humour from (great) Danes. But I wanted to show what I've learnt about FB from the other thread anyway...

 

[sonnya]

You are welcome... There should be space to all on this forum. Newbies and The people with lifelong experience.

 

[sonnya]

Some of your fellows have asked me if it is still possible to buy them.

The thing is.... I make as many as needed. There is a Limit on available KSC3503 and KSA1381.

But i would say a limit of 500 channel or 250 stereo sets but if more is needed i will make more of them....

 

[sonnya]

All new boards shipped will include KSC3503ESTU and KSA1381ESTU. also BARE PCB's.

Other who have got the kits as bare pcb or pcb with SMT assembled can just write it here and will get them for free.

KSC3503ESTU + KSA1381ESTU.

 

[buzzforb]

Sito. I got the boards today. I wish i could say i will build them immediately, but it will be a bit, as I am a bit behind. They look fantastic. The PSU boards could be used as a weapon in a Break in and That's without the caps mounted

 

[sonnya]

Good you like it.

the psu boards will not bend before the lock does.... just a tip...

For all here in this thread.. I have made an error in the guide. Trimmer R22 should be turned CCW first before powering up.

After powerup bias is set by turning CW.

 

[brianco]

Mine arrived on Tuesday.

So pleased that all SMT work is done!!! My 70 year old eyes would not see the parts let alone sort and solder correctly!!

I don't quite follow your remarks about Q18 +Q19. Are these now included in the cost? If so please send me these parts for a stereo set. I will send you the postage cost.

I will be on holiday in France until 22 September and hope to start building shortly after that date.

Thank you a good product and also for your speed and efficiency Sonny.

 

[sonnya]

Hi all.

I will ship transistors tomorrow and the kit for George.

Excuse me for my lack of participation .... I have been rather busy, as i have been asked if i could design a preamp for hypex modules as hypex don't offer such a solution for there boards.

 

[padamiecki]

TSSAF F=follower ))

just for fun
3Vpp

 

[sonnya]

 

[buzzforb]

Sonnya,
Didn't know if you would find this interesting. I just happen to be working on Nelson's F6, which uses transformer as phase splitter and came across this while looking around.

 

[Lazy Cat]

Excuse me for my lack of participation .... I have been rather busy, as i have been asked if i could design a preamp for hypex modules as hypex don't offer such a solution for there boards.

That's super and very honourable recognition from Hypex, good for them.

I can now tell my friends that I had opportunity to cooperate with Hypex designer.

OK, I'm very still in unrecognizable area but close, just bellow you somewhere.

 

[sonnya]

no no no.... It is not hypex that have asked me!

 

[Lazy Cat]

Oh I misunderstood, apologize Sonny

BTW did you have opportunity yet to listen to NC400 module? I only see praises all around the net.

 

[Joachim Gerhard]

padamiecki, did you build that circuit or is it only in simulation ?
It has lower distortion then the TSSA circuits i have seen here. I assume the 9mA current sources by pass the 4.7kOhm resistor. Otherwise the output will be totally over biased.

 

[Esperado]

I understand andrew and apply what you suggest(see under). For your value proposal let LC answer...
Marc

Idefixes, the feed-back resistance's position are the worse you can imagine. You could improve a lot distortion by doing something like this:

 

[sonnya]

The TSSA cannot run with 4.7K in its present state. But it is the way to go, to get more gain.

It is not precise enough in its currentsources...

Maybe version 1.7 will have this posebility.

 

[Joachim Gerhard]

Yes, that is the major problem of the TSSA, getting more gain without over biasing the output stage. padimiecki put in another twist, he grounded the output.

 

[Esperado]

to get more gain.

What is the min V in we are supposed to get for full power?
775mV rms to fulfill DIN requirements ?
1V to match most of the digital equipment ?
1.25V to match professional symmetrical equipment ?