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muddasirwaheedmalik 14th June 2012 08:41 PM

series regulated power supply with feedback for Nelson Amplifier
Can any one give any schematic for series regulated power supply around 30 V on rail with 20-30Amp capability.

Objective: an ultimate Single Ended Class A amplifer.

Items at hand: Heat sinks (for regulator and recitifers) 8 incx8 inch real good,
4x 300Amp Hitachi diodes for rectification, 2 x1DI500-030 , 3000W PD, 500 A darlington BJT for intended rectifier use.

Amp design and wattage not decided yet. around 100-200W Pure Class A.

Power consumption and inefficiency is not a consideration.

Any design with simple series BJT with op-amp feed back. Regards

AndrewT 15th June 2012 11:55 AM

Why do you want a feedback style of regulated supply?
Why don't you adopt a non feedback style of regulated supply as described in detail in the PASS website?

muddasirwaheedmalik 15th June 2012 12:45 PM

Andrew Feedback type would provide better regulation, hence the objective of preventing sagging of rail voltages at greater current loads .

muddasirwaheedmalik 15th June 2012 12:54 PM

data sheets
3 Attachment(s)
just for information , this is the BJT module which has prompted me to go fully regulated rail voltage for a constant bias Class A amp. regards

muddasirwaheedmalik 15th June 2012 12:56 PM

plus i have a pair of 2 KVA 220v:24+24 volt EI core transformers to use as mains.:-)

Boscoe 15th June 2012 01:00 PM

How many channels is this for? 2KVA and 2500W BJTs are a bit extreme aren't for two channels?

muddasirwaheedmalik 15th June 2012 01:47 PM

Agreed. I have two 2500W BJT which i salvaged from a used UPS station costed me USD 15 each. hence the reason for already available devices at hand.

Its for two channel at the moment, i may upgrade to 4 channels in future for bi amping

As i want to least stress each active component of my system hence i assume i would not be using no more than 800 VA of each BJT for very safe , reliable and linear operation.

muddasirwaheedmalik 15th June 2012 01:48 PM

Plus if i want 100 W class A fixed bias amplifier i assume i will be constantly using at least 400 watts of load from each supplt.

muddasirwaheedmalik 15th June 2012 03:51 PM

For Son of Zen , 25W of output require a 1 KVA transformer.
for 20W output we need at least a continous 200W disspiation in resistors alone!
So for around 50W continours SE nothing less than 2 KVA will work and 2500W Pd power BJT doesnot seem too big ????

Boscoe 15th June 2012 04:05 PM

That's completed ridiculous and a waste of time. Speakers need a lot of power for dynamic peaks in the music we listen to. A 20W amplifier will clip a lot with properly recorded music. You may not recognise it at mediocre levels but it's there and will not sound as good as a more powerful amplifier. I recommend at least 150W/ch for proper listening. Proper high fidelity active speakers afoten use over 500W/ch total per channel on small 5" drivers.

SE also has very high distortion, very low output powers, are very big and extremely inefficient. To me there are no wins what so ever.

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