4S amp by Dr. Borivoje Jagodic

[electromagix]

Hello Guys,
anybody ever tried 4S amp by Dr. Bora ?

 

[electromagix]

My attempt of 4S amp, found interesting for 'my' ears !

 

[adason]

Can you post spectrum profile at 0.1 and 1 watt?

 

[adason]

Is R5 for bias? How much current are you running through outputs?

 

[electromagix]

1.to 1.8A is my tested bias
Only information I have about this project is attached. I haven't done much tests, only output power with a 4 ohm load.

 

[indianajo]

Elegantly simple.
2 more transistors + 10 v more rail voltage gets me 72 watts instead of 38. Apex AX6.

 

[electromagix]

Hope you know the difference between class A and class B.

 

[indianajo]

1.to 1.8A is my tested bias

If this circuit wastes 1 to 1.8 A of rail current at idle, to produce 38 w into 4 ohms. then it is a useless pile of trash. The heat sink required for Q1 + Q2 would be $$$.
The competition quoted in post #6 wastes 20 ma of idle current, or 1.4 watts, to produce 73 watts (24.2 vac out).

 

[electromagix]

Pls. Enlighten your knowledge by reading the difference in topologies like, Class A, B, AB, D, H etc. In audio amplification.

 

[indianajo]

Class A was high tech in the 1950's when a power transistor in a 3 watt output car radio cost >6 hours pay. I knew black movers who had worked for <$.75 an hour prior to inflation.
Now that power transistors cost <6 minutes pay, and we are suffering the hottest days ever and the most floods forest fires and hurricanes ever, Class A is stupid tech. Especially stupid is a 38 watt output version that consumes 108 watts.

 

[Vunce]

Wow!
If you saw the collection of amps I have, I must be extremely stupid 😂

 

[electromagix]

Class A was high tech in the 1950's when a power transistor in a 3 watt output car radio cost >6 hours pay. I knew black movers who had worked for <$.75 an hour prior to inflation.
Now that power transistors cost <6 minutes pay, and we are suffering the hottest days ever and the most floods forest fires and hurricanes ever, Class A is stupid tech. Especially stupid is a 38 watt output version that consumes 108 watts.

Oh yah ! Someone must ask the pass labs, burmester and Macintosh to seal their facilities !

 

[adason]

I run my classA amps in winter, I must be semi stupid 🙂.

 

[TNT]

Doctor in electronics?

//

 

[ostripper]

He has better designs than this. I was inspired by his big collection (20+ designs).
Making fun of class A ? most AB amp VAS's run in class A. EF3 runs in class A until the (final) output stage.
OS

 

[EdGr]

For comparison, the computer that I am typing this on consumes 110W when idle and 330W when the CPU and GPU are both at 100%. It runs at stock voltage and frequencies.
Ed

 

[huggygood]

Wow!
If you saw the collection of amps I have, I must be extremely stupid 😂

I run my classA amps in winter, I must be semi stupid 🙂.

we're all someone else's stupid 🙂

 

[NanoFarad]

Class A was high tech in the 1950's when a power transistor in a 3 watt output car radio cost >6 hours pay. I knew black movers who had worked for <$.75 an hour prior to inflation.
Now that power transistors cost <6 minutes pay, and we are suffering the hottest days ever and the most floods forest fires and hurricanes ever, Class A is stupid tech. Especially stupid is a 38 watt output version that consumes 108 watts.

I appreciate your views. At least some people cares about global warming & other environmental consequences.

Best regards

 

[abstract]

Just run it on DC solar power, and use a small pump that circulates the pool water through the heat sinks. Do I have to solve every little problem? 😎

 

[NanoFarad]

Who asked you? 🙄