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Old 6th October 2006, 07:11 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Default Signetics NE540 / SE540 power amplifier


Has anyone built a NE540 based power amplifier?

I'm looking at a Signetics NE540 power amplifier design in Audio IC op-amp applications by Walt Jung. The design is referenced to Signetics Corp' and by my understanding is a NE540 op amp and Sziklai pair outputs with local feedback paths. Could be wrong though!

Note: I wasn't sure whether to post to solid state or chip amp forum!
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Old 14th February 2013, 05:05 PM   #2
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I made a lot of them back in the 70s. 35 watts a channel.
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Old 14th August 2015, 08:51 PM   #3
Maitchy is offline Maitchy  New Zealand
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I have used NE540L's in the past, and still have some chips. Good idea having the output stage of an opamp split to allow a Vbe multiplier, very good slew rate, but you do have to be careful with high frequency stability (be careful with layout; don't reduce the closed-loop gain too much to reduce THD), and it is a bit harder to keep crossover distortion low as the temperature changes (Vbe ref cannot be in thermal contact with output transistors in the datasheet's recommended circuit, but you can still disable that and supply your own external transistor). They did have a circuit option that had a good fold-back limiting cutout feature as far as I can recall. The SE540 has a higher voltage rating, but I have only tried NE540's.
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Old 14th August 2015, 09:00 PM   #4
infinia is offline infinia  United States
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yes indeed the 1st chip amps
TO-5 can with external PNP / NPN pass devices > ~25W if memory serves
I made a few pair in high school using the supplied artwork shown on the app book (hard-back). they are prone to oscillation unless bypassed very well. +/- 25 V implies 50-60V bipolar process

I also built a DC/DC converter to power them using a push-pull on a 1.25 " ferrite toroid
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust

Last edited by infinia; 14th August 2015 at 09:14 PM.
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Old 18th August 2015, 05:22 PM   #5
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I made quite a few amps using NE540s in the 1970s. I didn't have any problems with them. Used 30 amp output transistors ECG 130 and 131. Got 35 watts at 8 ohms. Never tried using 4 ohm speakers since I didn't have any. No oscillation problems.
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