New amp design ?

[Frank40]

Hello there

I have been working whit a new design (I think). It is a one stage amp. whit 0 dergree phaseshift, voltages gain and low output imp.

It sounds verry nicely, much like a single end tube amp. Please tell me what you think.

Regards

[Nelson Pass]

Perhaps I'm missing something, but Q1 and Q3 don't look to
actually be doing anything. Is there an error?

[anatech]

Q1 and Q3 appear to try and affect the ground reference to the power supply. The resistor values seem to be off for this.

Either that or they just pump signal to ground to heat the heatsink.

-Chris

[JCM]

Edit : okay I see the ground is connected to the speaker through the 220 ohm resistor.

I'm still not sure what that pair does other than drive the 10 ohm resistor. That would stress the power supply. Not sure 5 watts is enough. I would think the effect would be dynamic range compression.

At this moment I am listening to my latest monstrosity, a 2 W / ch Zen-style source-follower amp. But in my memory, the Zen common source circuit sounded better. It seemed to effortlessly and happily give up music, and I had to drive it HARD, all 1 watt of it, to get it to sound bad. This one immediately sounded a little gritty to me, though I've gotten used to it.

[lumanauw]

Hi, Frank40,

It seems you build something like Crown's Grounded Bridge topology (like used in Crown MA600 or MA1200), where 1/2 power is used to modulate the supply ground (like Hafler's Transnova) + the other 1/2 half is working like normal power amp.

It sounds verry nicely

So it is working? How about input impedance? Does it needs powerfull preamp to drive it?

[Frank40]

No erros, Q1 and Q3 whit R9-R12, Is the voltages gain currit.

[lumanauw]

Hi, Frank40,

No erros, Q1 and Q3 whit R9-R12, Is the voltages gain currit.

My mistake then. You are not building Grounded Bridge topology

[Frank40]

Well it dose work here is a pic. I vell get back to you explening
how it works.

[Tom2]

Voltage gain:

V(speaker)=V(in) * (1+ ( R12/R11) ) (approximately)

That is the way I see it. Interesting idea.

Tom

[lumanauw]

Voltage gain:

V(speaker)=V(in) * (1+ ( R12/R11) ) (approximately)

How do you get that? Could you describe how this works?

How many watts this amp gives? In what class, hot classA or cold classAB? Why R11 and R12 is 5watt rating, do they share all the speaker current? Does the supply stays rigid or modulated like Transnova?

That is the way I see it. Interesting idea

You're right. If this is not Crown's Grounded Bridge topology or neither Hafler's Transnova, and works good audio, Frank40 could apply a patent for it