Death of Gain Clone

[abpea]

Need Power Supply Recommendation

Hi Guys,

I'm building the current version of Bora's amp (post #314 above) but don't have a power supply yet. Can someone recommend a nice regulated shunt ps I could use with this amp?

Thanks -
Bruce

 

[Zen Mod]

Re: Need Power Supply Recommendation

Hi Guys,

I'm building the current version of Bora's amp (post #314 above) but don't have a power supply yet. Can someone recommend a nice regulated shunt ps I could use with this amp?

Thanks -
Bruce

shunt?

you have wall of heatsinks or you can put all power transistors in near lake?

shunt reg for A class amps isn't economical solution ....... even for A class afficionado

 

[abpea]

Hey Zen Mod,

Thanks for the quick reply!

Which PS would you suggest/recommend for this project?

Thanks -
Bruce

 

[Zen Mod]

either brute force PSU (read - mucho uF ) or series reg .

go to Rod Eliot's page and you'll find few useful pages ;

look for Death Of BOZ ............

😉

 

[abpea]

Thanks again Zen Mod!

I'll start my search at the sites you referenced.

Bruce

 

[sonobox]

Regulated Snubberized PSU +/- 30V

either brute force PSU (read - mucho uF ) or series reg .

go to Rod Eliot's page and you'll find few useful pages ;

look for Death Of BOZ ............

😉

Why not build a regulated snubberized PSU, like Carlos Filipe (destroyer X) proposition for gainclone amps:
Ver. 1.2 in Nuuk's Dongeon with all explanations, which was published first in this forum.

Kind regards

sonobox

 

[widowmaker]

Here is a schematic of DC version of this amp:

 

[widowmaker]

how to make inductors:

 

[widowmaker]

next step:

 

[widowmaker]

and next:

 

[widowmaker]

coming soon - pdf file of PCB (last version)

for sale:

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

price for 2 boards (without components)+paper sheet with component location view - 20 EUR (without shipping taxes).

widowmaker@mail.bg

 

[peranders]

Is it possible to get thermal stability without any emitter resistors at the output stage?

 

[widowmaker]

It is possible, offset is floating approx. +/- 20-30mV
Current source for IRF620 is unstable "upside down", wich compensate instability of diff. input stage...
Carefully look at schematic - there are transistors after shunt regulator 431, and "strong point" for 620 is emmiter of CS for Diff. stage.
I have score of amps, no problems with offset.

 

[richie00boy]

I think he means stability of bias current, not output DC offset.

 

[peranders]

Yes, I mean the stability of the bias current with different temperatures.

 

[widowmaker]

Bias current for 9610 is higher than necessary (in this case), so unstability is not much important value...

Is it possible to get thermal stability without any emitter resistors at the output stage?

Output transistors ("dumpers") are near class B - approx. 320-350mV Ube (depending on temperature range).
This is a feedforward error correction amp.
Dumpers originally working without idle current.

 

[kalmara]

Kolega, haresva mi usilvatelq - slushah go v edin priqtel, no iskam samo da otbeleja...na kartinkata za izhodqshtite droseli pishe (0.86 with lack isolation) ... lack na angliiski oznachava lipsa na neshto i edva li horata sa razbrali kakvo se ima vpredvid, spored men po-dobre za lakovata izolaciq e da se izpolzva varnish. S netyrpenie chakame pdf-a na platkata, za da izprobvame i pravotokovata versiq. 😀

 

[tiefbassuebertr]

This is also an interesting approach (unfortunately only to find only by chance regarded the therm "Death of Gainclone" insted the actually term for this topology), especially for translate into a CSPP topology (Circlotron).
I will study this thread next time.
In this case also this thread could be of interest:
http://www.diyaudio.com/forums/chip...ed-topologies-yamaha-mx-10000-quad-405-a.html

Here an inspiration for a solution for an enclosure/cabinet
Synergy - LM3875 Gainclone Amplifier (Chip Amp)

 

[ontoaba]

The GC case is really beautiful, small and funny.

 

[ljm_ljm]

CURRENT DUMPING ？
I VERY LIKE。
BUT,MOSFET TO DARLINGTON ，I believe there will be a better force。