4-part Harmony, a 9 watt class A amp using a voltage regulator IC.

[thalis]

BUMP!

I’m just bringing in surface this old thread.
I admire Ciclotron's creativity!
And I'm going to experiment with all his 317 circuits ;-))

Regards,
Thalis

 

[joensd]

You´ll find similar interesting circuits here.
tubecad
This is Just an example though, there´s much more on tubecad.

greets
Jens

 

[thalis]

Yes dear joensd, I was aware of this 4W se LM317 amp, after all it is also mentioned in the 2nd post of this thread - but thanks anyway

 

[joensd]

 

[hifryer]

amps

Down to Circlotron ,this is a SUPER COOL thread!!!

Circlotron, If I wanted to experiment with all these, in dual mono what would you recommend as the best one channel Power supply for these purposes, as a keeper.

If essential I guess I could get tapped secondary toroids built to allow some range of high current low impedance supply.

I guess I need windings for the ocassional +/- 15V ultimate DC op-amp supplies also??? What is best for these without frying regs but with adequate headroom?

Do you have a pet DIY, super quality, lab supply you love? I want to build high quality and NOT just buy a single or dual lab supply!!

For ultimate versatility do I need dual??

thanks

 

[Circlotron]

Well, seeing they are a power supply reg, they have great supply rejection They are about as uncritical as you can get. Don't go nuts with the supply voltage; use just enough to guarantee maximum positive output swing and that'd do, I reckon. 4700uF should be enough across the supply rail. I used ST brand regs - not sure if I mentioned that - so I can't guarantee results with another but i'd be interested to hear how you go!

 

[hifryer]

Ciclotron,

what voltage and VA AC from the trans??

Despite PSRR, will one trans and supply do 2 channels or is dual better?

thanks

 

[ash_dac]

Hi,


What specs' does the op amp that's inside a LM317 have?

Could probably work it out form the LM317 datasheet graphs I guess but I'm feeling lazy.