modified proj. 68 (esp) - could this work - diyAudio
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Old 27th July 2002, 05:12 PM   #1
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Question modified proj. 68 (esp) - could this work


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:
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Old 30th June 2004, 10:46 PM   #2
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you had better check the breakdown voltage for your BC546B transistors, (ECG 123AP) same as 2N3904, 2N4401, 2N4403...

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Old 30th June 2004, 11:17 PM   #3
sss is offline sss  Israel
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also mj15003/4 rated at 140V max , u got 150
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Old 1st July 2004, 12:15 PM   #4
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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.
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Old 1st July 2004, 12:46 PM   #5
moamps is offline moamps  Croatia
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And PNP output devices aren't correct polarisated (reverse collectors and emitters)
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Old 2nd July 2004, 09:00 AM   #6
djk is offline djk
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Two year old thread.
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Old 2nd July 2004, 01:54 PM   #7
fab is offline fab  Canada
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The project 68 has already been updated to include higher power with warnings about the implementation. Take a look again on the site.

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