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Motorola TPN1136A, TPN1154A, and VPN1013A Power Supply Schematics Provided by Eric Lemmon WB6FLY Posted by Robert Meister WA1MIK

All three power supplies are very similar, but the latter two have dual-voltage transformers and a 25,000 uF filter capacitor. The TPN1136A has a 120 VAC-only transformer and an 11,000 uF filter capacitor. Curiously, I own a stock TPN1136A power supply that has two M9244 pass transistors in parallel, even though the schematic diagram for it shows a single M9639 pass transistor.

I ran a load test on my TPN1136A power supply, and found that it can carry over 17 Amperes - if the AC Mains fuse is increased in rating. With the specified 2A fuse in place, the supply can carry about 7.5 Amperes. The load test report is available as a short PDF file here.

I finally acquired a working TPN1154A power supply, and confirmed that it is both electrically and physically identical to the HPN3000A power supply. They share the same transformer, rectifier bridge, filter capacitor, regulator board, and output pass transistors. As manufactured, the output voltage is fixed at just below 15 VDC, but adding a 5.6 kohm resistor in parallel with R7 will reduce the output to about 13.9 VDC. A photo of this unit can be found here.

I ran a load test on this unit. The power supply can provide 20 Amperes before the rating of the AC mains fuse (5A FB) is exceeded. However, the emitter ballast resistors used to equalize the currents in the two pass transistors are each rated at 7 watts, so the load should not exceed 16.7 Amperes or the resistors be overloaded. The load test report is available as a short PDF file here.

For those readers who want to vary the output voltage of a TPN1136A or TPN1154A power supply, note that the VPN1013A power supply schematic shows a 500-ohm pot (R9) that was added to vary the base bias of the Reference Amplifier transistor Q2.

The schematic for the TPN1136A power supply (earlier version) is available as a small PDF file here.

The schematic for the TPN1136A power supply (later version) is available as a small PDF file here.

The schematic for the TPN1154A power supply is available as a small PDF file here.

The schematic for the VPN1013A power supply is available as a small PDF file here.

Credits and Acknowledgements:

These PDF files were obtained from MAXAR, MCX100, and MCX1000 service manuals. They were posted in the Repeater-Builder Yahoo Group Files section on or around 14-Feb-11 by Eric Lemmon WB6FLY. They were retrieved by Scott KB0NLY. Bob WA1MIK formatted the text as an HTML article and posted everything on the Repeater-Builder web site.

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This page originally posted on Saturday 14-Feb-2011.