modified proj. 68 (esp) - could this work

[lenti]

hi,

i have modified project68 from esp. it should deliver around 540watts in 2ohms. i have used the mj15003/4 as output devices. each side could handle 1000watts (Pd), makes 2000w total Pd. with 1000w for 500w out i hope i'm on the right side to drive 2 ohms. and i would use a 2000watts trafo for a stereo amp.

here is the circuit:

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

regards

lenti

 

[cunningham]

you had better check the breakdown voltage for your BC546B transistors, (ECG 123AP) same as 2N3904, 2N4401, 2N4403...

 

[sss]

also mj15003/4 rated at 140V max , u got 150

 

[richie00boy]

You also need to change the driver transistors from MJ15030/31 to something much beefier. They will smoke very quickly with 1 ohm emitter resistors and 75V rails. I also would add another pair of o/p devices, unless you are not using any insulating washers on the transistors (so separate sinks for NPN and PNP) and a very well cooled heatsink.

 

[moamps]

And PNP output devices aren't correct polarisated (reverse collectors and emitters)

 

[djk]

YAWN !

Two year old thread.

 

[fab]

The project 68 has already been updated to include higher power with warnings about the implementation. Take a look again on the site.

Fab