PSU Design of Chevin...

[HaaiFaai]

Who cares, as long as it is designed well, can you hear the difference between a LAB Gruppen amplifier/QSC powerlight series and a conventional design?
The usage of switching power supplies in the future will be more and more, and when careful designed it will reduce the rf output.
But I don't want to start a discussion about the usage of switching/high frequency power supplies and conventional psu's because that will be a never ending story about pros and cons...

[Loner]

Thanks for your info HaaiFaai.
Well, I,ve just finished a prototype of a 1000 w. power supply using the Chevin PSU design as starting point. I did some mods on the secondary of the output transformer to obtain +110 volts and an aux secondary to get +-15 volts because my power amp is a Powerhouse IcePower 1000A digital amp sample that needs these voltages.
It works, I connected two identical ETD49 transformers in parallel to obtain the current needed and the oscillator has 12 IRF740, by now everything works, so I,m thinking about changes to get more power ,maybe 2000 watts or so to supply 2 amps. Maybe it is possible to use different Mosfets and a bigger transformer or maybe IGBT transistors. Very clever and simple design and very powerfull.
¿It would be possible to change the small oscillator inductor by a oscillator IC to avoid the manual work?

[HaaiFaai]

Good work you get it running! I think the usage of the small signal transformer is just the great simplicity of the design,no IC's but a real high frequency (about 100 kHz)psu
which is light/small because of the ETD 49 transformer.
In the original idea is to use two steering units (two PCB units) one for each ETD 49 transformer. So that makes 12 times IRF 740 for each transformer(about 1 KiloWatt per channel) .If you want I can send you my drawing of the psu.

[richt]

hi folks

i sold those amps in my area long ago!
if someone can e-mail me the psu schematic i will
appreciate it!!

or i can trade info for a new amp design for djs & clubs.
that i am designing using tube input/phase inverter & driver,on the output solid state!

i am trying to make a bulletproof amp that never blows
(djs) & the power of the solid state output

richt
thank you

[dirkl]

Hello!

to repair a chevin A1000, i need a schematic
please send as an *.pdf-file
Thanks a lot.

Dirk