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PMA 25th September 2007 08:09 AM

Power amp with current output, F1 competitor (kidding)
2 Attachment(s)

I have taken note of the F1 popularity. If anyone of you wanted to play with current output amplifier, here is the circuit hint. It is up to you to calculate part values :D.


destroyer X 25th September 2007 08:17 AM

I have tried once...but i had problems with off set.

Please, instruct us how to control the off set and suggest some values to this schematic.

Was one schematic that our forum friend Ostry provided me and i could not control the off set...not exactly this one you suggest..but alike related the topology.



Vix 25th September 2007 08:20 AM

And where is the nice paper, with all the explanations? :devilr: :clown:

Ipanema 25th September 2007 08:30 AM


control the off set
You might want to use a DC servo.

PMA 25th September 2007 09:06 AM

Hi Carlos,

yes, the DC offset depends on sameness of N and P halves. It is not that bad, though, even with change of

temperature. In case you disconnect the load, the DC increases substantially. Also, for higher ohm load the DC

increases. And gain increases with load, this is a current output amplifier.

The DC servo injecting current into input node would be the cure, as Ipanema has mentioned :up:


DarkOne 25th September 2007 10:36 AM

You should also move resistors from drain of output transistors to their source to improve linearity.

PMA 25th September 2007 10:42 AM

No, unless you want the amplifier to blow.

And distortion s HIGHER with resistors moved into sources!!

PMA 25th September 2007 11:48 AM

2 Attachment(s)
Hereby something with component values. Iddle current is 1.5A. Transadmitance is about 0.725A output current to 1V input voltage difference (0.725A/V).

PMA 25th September 2007 12:16 PM

2 Attachment(s)
+ DC offset compensation

lumanauw 25th September 2007 01:58 PM


No, unless you want the amplifier to blow.
Why is that?

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