Chippewa - 56 Watt OPA453 with Diamond Buffer output

[lineup]

Transformer: 2x25V 300VA
Output Max: 56W into 8 Ohm
The opamp OPA453 is a TO-220 7pin device.
Which can have max +/-40VDC supply.
With the above transformer supply will be like +/-35VDC.

 

[hbtaudio]

How many more Indian tribes will we have to digest with the same infusion?

The recipe is now well known - and I want a dozen of these super-duper FETs immediately ... I think I'll start a small series with the Germanic tribes too
😉
with BJTs

Greetings,
HBt.

BTW a nice Amp

 

[hbtaudio]

So if you make a really stunning amplifier for Winnetou, the great Apache chief, then I'm in. I would like to have a 100Wrms Monster (Apache) with nominally 4-ohm speakers.

Without OP amp, unless it is completely discrete built -please.

☕

 

[lineup]

@hbtaudio
The input and VAS voltage amplifier stage can use a massiv number of transistors.
Making it more than half of an amplifier.
All this can be replaced by one opamp. This is what I do. And it works .....

Call one of your amplifiers Winnetou. That is a great idea 🙂
Beelzebub is not so nice 😀

 

[WhiteDragon]

I think I'll start a small series with the Germanic tribes too
😉
with BJTs

Sounds good, matching transistor types make more sense for diamonds.
And more devices for lower impedance like 4 ohm

 

[Monstercore]

Lineup how about distorsion and noise figures?

 

[lineup]

Noise I can not test.
But the THD is not the lowest but low enough.
THD 0.001%

 

[exlabs]

The input and VAS voltage amplifier stage can use a massiv number of transistors.
Making it more than half of an amplifier.
All this can be replaced by one opamp. This is what I do. And it works .....

This is a really good point.

I have recently been wondering the same. Why is the op amp approach not so common to see? Are there technical reasons?

 

[lineup]

I think it is just more fun with transistors.
To design for yourself.
But this is not always for the better.

 

[de Ocampo]

Duty factor? while I was still doing amp repairs on a friend's electronics shop, opamps also fails in some cases. Another reason I think is, opamps are provided in a single package of circuitry. No other option for personal modifications?

Albert