www.webx.dk Start page
OZ2CPU Radioamateur mainpage
Homemade electronics Stuff old and new
Standard Power SPS 220-24 M2564 Power Supply full teardown pictures schematic
psu top
SPS 220-24 name plate
psu top
psu top
pcb top details wires
top details
top details 2
pcb top no wires
heatsink alle wires
pcb bottom details
power transistors back pinout, OLD type of RCA NPN,
you can offcourse 2N3055 for replacement since it is fully pin and function compatible.
(I suggest to replace all paralleled transistors to same brand and type if one original is defective)
power transistor original RCA type number 109575-00 date code 1986 week 32
I was not able to look this one up online. But I double checked its performance to be similar to 2N3055
power transistor driver
power transistor driver closeup
power transistors
power transistors on heatsink
PCB top scanned
PCB bottom scanned
Schematic of SPS 220-24 heatsink parts
Schematic of SPS 220-24 controller PCB
NOTE : this is a FOLDBACK over current protection system. it will shut down when over current, set point by R6
IF a Constant Current limitor is wanted: connect C2 GND, and Q5-E and C5 GND to K
R10 top side connect to C2 + side, this will keep refferance voltage stable while overloaded.
Screw Terminals
Mains Voltage selector
Transformator numbers
Wires back side of terminals
-----------------------------
Thomas Scherrer OZ2CPU 2015
If you found this page usefull, why not consider donate a bit.. see my contact page please.