SymFet - The Small Amplifier

Inspiration is Jean Hiraga. He did some minimalistic amplifiers.
He put only those things in that were absolutely necessary.
He even tried to remove as many transistors as possible.
He also knew that there is a difference between quality & quantity.
100 Watt is not necessarily giving more pleasure than 5 good Watt.
Have a look at his Monster. With 5 Watt in Class A and +/-12V supply!


Once you can get a hold of & match 2SK170BL and 2SJ74BL,
then this amplifier will be easy to build.
Works at +/-12V in Class AB, with MJ15003/MJ15004.

Three components to adjust.
- Adjust R4 for 5 mA across R1 and R8.
- Adjust voltage source V2 för 50mA idle in output.
- Adjust R9 for close to 0.0V output DC-Offset.
...Note: You may have to put R9 at the upper side. Across R1.

Spice measurements:
Max 5.77 Watt into 8 Ohm, <0.100% THD
Max 10.9 Watt into 4 Ohm, <0.100% THD
Nominal 1 Vrms input gives 5.4 Watt into 8 Ohm and 0.011% THD
1 Watt RMS into 8 Ohm gives 0.005% THD
Upper frequency is 500kHz with C1 75pF.


=============

Finally, this was one more circuit idea by me.
I have publish many through the years.

If this amplifier had been presented by John Curl or even Nelson Pass
there would be instantly 100-reds of guys rushing to the electronics shops
to get the stuff to build this amplifier.

And this topic would go on for decades with thousands of replies
and constant discussions about this genious design of the guru.

Will it stop me from publish my ideas, that I know they will never be used?
No. I believe in my stuff. I know some of my ideas are great.
Maybe someday, some guy will read this and see the beauty.
On that day I probably will be dead and buried.
Eventhough the state of things make me a bit sad,
this will not stop me from doing what I do.
And so at least feel content.
I only did what I had to do - being me
... Lineup
 

Attachments

  • symfet_1.png
    symfet_1.png
    14.7 KB · Views: 716
If this amplifier had been presented by John Curl or even Nelson Pass
there would be instantly 100-reds of guys rushing to the electronics shops
to get the stuff to build this amplifier
And this topic would go on for decades with thousands of replies
and constant discussions about this genious design of the guru.


... Lineup


Hi , Lineup
 

Attachments

  • J CURL 3.gif
    J CURL 3.gif
    12.8 KB · Views: 672

kASD

Member
2004-12-25 12:24 pm
N/A
Finally, this was one more circuit idea by me.
I have publish many through the years.

If this amplifier had been presented by John Curl or even Nelson Pass
there would be instantly 100-reds of guys rushing to the electronics shops
to get the stuff to build this amplifier.

And this topic would go on for decades with thousands of replies
and constant discussions about this genius design of the guru.
... Lineup

I believe in your design and concept.......and they do have potential;)

Kanwar