elf best amplifier (mosfet)

[Veysel]

high psrr
high slew
high snr
low thd
Most clear sound.
simple

 

[MAAC0]

What a Spaghetti mess. Hope it works.

 

[globalplayer]

Surely looks interesting.

 

[mk57]

One mans mess is another mans treasure....looks like my builds.. looks bad sounds great!!

 

[adason]

Nice circuit

 

[suzyj]

Like the three stage goodness. What’s the OLG? I’d imagine that’s capable of 100dB. Surprised your implementation isn’t oscillating though, as there’s rather a lot of random parasitic there.

 

[Veysel]

No problem , no oscillate, very stable.

 

[juma]

Emitter followers are not really needed between input LTP and VAS but they will improve the amp significantly if used between VAS and output HEXFETs.

Also, one small MOSFET (f.e. IRF610) will do better job as temp. comp. device than two BJTs. Vgs multiplier is needed here, not Vbe - ouput devices are MOSFETs so it's advantageous to use the same behaving device for thermal control.

 

[janusz]

Looks like a mixture of eti5000 and playmaster.

ETI5000 attached. Note that 18V zener must be inserted between collectors of Q5 and Q7 - the original pdf image. That notably reduces temperature of associated transistors.

cheers,

 

[suzyj]

Thought it looked familiar.

 

[nigelwright7557]

I built a disco amplifier which looked similar to that many years ago.
Had the same massive heat sink. It came in handy one night when the fan failed.
I had my pint on top of the amp and the pint got warm !

 

[de Ocampo]

I like the name Elf, sounds like a low power amp.
Nice project Veysel!

 

[diyman]

Built this amp many years ago. not really fantastic. The Elektor Crescendo is much better!!

 

[Veysel]

I like the name Elf, sounds like a low power amp.
Nice project Veysel!

Thanks you.