On Monday, August 26, 2019 at 11:09:15 AM UTC-4, John Robertson wrote:


Actually the PCB silkscreen indicates that this is an IC as it is called
"U2", instead of a "Q" designation - Q for transistor and U for IC is a
common convention. I would then suspect it may be a 15VDC regulator as
this is some sort of switch mode power supply.

John :-#)#

And if this is the case, a TO-92 package, 15+ V regulator is he

https://www.newark.com/on-semiconduc...-1a/dp/42K1178

Same source for a 15- V regulator as well.

Peter Wieck
Melrose Park, PA