LM4780 PCB power transformer

Jim Karr · 6th January 2005, 06:16 PM

I just populated a pair of Brian's LM4780 boards, and now it's time to apply voltage.

I am a bit unclear....is this bridge designed to accept a center tap transformer 25-0-25 or the AC output from each of two different, separate secondaries with identical voltages?

jackinnj · 6th January 2005, 06:29 PM

I am using 20-0-20 with dual independent secondaries -- this puts out a little under + and - 28V .

make sure that the LM4780 is snugged up to the heatsink --- I found that when it is properly affixed the distortion went down by about 0.03% This chip doesn't like to get real hot. (see the thread I started on heatsinking the LM4780).

6th January 2005, 06:16 PM	#1
Jim Karr diyAudio Member Join Date: May 2004 Location: Southwest Michigan	LM4780 PCB power transformer I just populated a pair of Brian's LM4780 boards, and now it's time to apply voltage. I am a bit unclear....is this bridge designed to accept a center tap transformer 25-0-25 or the AC output from each of two different, separate secondaries with identical voltages? __________________ As for me and my household, we shall serve the Lord. Joshua

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6th January 2005, 06:29 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	I am using 20-0-20 with dual independent secondaries -- this puts out a little under + and - 28V . make sure that the LM4780 is snugged up to the heatsink --- I found that when it is properly affixed the distortion went down by about 0.03% This chip doesn't like to get real hot. (see the thread I started on heatsinking the LM4780).

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