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Chip Amps Amplifiers based on integrated circuits

Power xformer for chip amp
Power xformer for chip amp
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Old 15th November 2004, 08:18 PM   #1
Jim Karr is offline Jim Karr  United States
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Join Date: May 2004
Location: Southwest Michigan
Question Power xformer for chip amp

I am planning on building one of BrianGT's LM4780 chipamps when I gather all the necessary items to start... I have in my pile of old transformers a unit with secondary winding providing 37 vAC on each side of a center tap.

I realize this will give me about 52 VDC after rectification. My question is this: Will this overdrive the 4780 chip?
National's datasheet shows maximum of 84 volts, but all their circuits are designed at 35V plus and minus. Will my xformer work?
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Old 15th November 2004, 08:20 PM   #2
Tim__x is offline Tim__x  Canada
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52+52=104

It'll blow your chipamp.
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Old 15th November 2004, 11:17 PM   #3
Stocker is offline Stocker  United States
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So quick to give the big "XXX"!

Regulate it down to a safe voltage if you don't mind the heat generated by the regulators (and the wasted power)

If you don't want to regulate the power supply, rewind the transformer for the appropirate voltages. In this case, that should be, UNwind for appropriate voltages! It usually is NOT all that difficult, but quite intimidating nonetheless.
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Old 16th November 2004, 12:05 AM   #4
Tim__x is offline Tim__x  Canada
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I didn't say it was impossible, I just said that as is, it will blow that chip.
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