Description
Semtrol Electronics PS105-21 Triple Output DC Power Supply +5 +15 -15V 115/230VAC
The Semtrol Electronics PS105-21 is a triple-output linear DC power supply providing three regulated DC rails: +5V, +15V, and -15V. It accepts either 115V or 230V AC input, making it adaptable to both domestic and international mains. Built by Semtrol Electronics of Anaheim, California — then an operation of Western Gear Corporation — this is a robust open-frame industrial supply dating from the early 1970s, designed for integration into custom equipment cabinets and industrial control systems.
Specifications & What's Included
- Model: PS105-21
- Manufacturer: Semtrol Electronics, Anaheim, CA (an operation of Western Gear Corporation)
- Input Voltage: 115 / 230 VAC (selectable)
- Output Voltages: +5V DC, +15V DC, -15V DC (triple rail)
- Output terminal strip labeled: UNREG, COM, -15, COM, +15, +5, GND, AC, AC
- Adjustable +15V output via front-accessible +15 ADJ trimmer pot
- Form Factor: Open frame / chassis mount
- Large aluminum finned heat sink assembly for passive cooling
- Internal transformer and linear regulation PCB assembly
- Includes: AC power cord and output wiring harness with multi-pin locking connector
- Customer Contract No.: 82R00000EA
- Date of Manufacture: March 1970
Applications
Multi-rail linear DC power supplies like the PS105-21 were a standard building block in custom industrial control systems, scientific instrumentation, and automated test equipment from the late 1960s through the 1980s. The combination of +5V (logic), +15V, and -15V rails is a classic configuration that powered TTL and early CMOS digital logic alongside bipolar analog circuitry — op-amp circuits, analog signal conditioning, and instrumentation front-ends all relied on symmetrical ±15V supplies of this type. Semtrol Electronics and similar mid-century specialty power supply manufacturers built these as OEM sub-assemblies, meant to be integrated into larger equipment cabinets rather than used as standalone bench supplies. Today these units are sought by engineers maintaining or restoring vintage industrial and scientific equipment from the same era, as well as by hobbyists and builders needing a proven linear triple-rail supply for analog electronics projects.
This Semtrol Electronics PS105-21 Triple Output DC Power Supply has been powered and tested at our facility and is confirmed good on all output terminals — as shown in the test photos. The +5V output measured 5.31V on our multimeter during testing. The unit shows the cosmetic wear you would expect from a piece of vintage industrial equipment: the chassis has surface oxidation and grime, the rating plate label is worn, and the open-frame wiring shows age-related patina. The internal PCB and components appear intact with no obvious damage. An AC power cord and output wiring harness with connector are included. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Semtrol Electronics |
Model: |
PS105-21 |
MPN: |
PS105-21 |
Type: |
Triple Output DC Power Supply |
SKU: |
47628 |
Input Voltage: |
115/230 VAC |
Input Frequency: |
50/60 Hz |
Output Voltages: |
+5V DC, +15V DC, -15V DC |
Number of Outputs: |
3 |
Phase: |
Single Phase |
Output Configuration: |
Multiple / Triple Rail |
Customer Contract No.: |
82R00000EA |
Condition: |
Used – Inspected and Tested |
Form Factor: |
Open Frame / Chassis Mount |
Power Requirements: |
115/230V AC |
Country/Region of Manufacture: |
United States |
Manufacturer Location: |
Anaheim, California |
Parent Company: |
Western Gear Corporation |
Seller Notes: |
Includes AC power cord and output wiring harness with connector |
Condition Notes: |
Semtrol PS105-21 Triple Output DC Power Supply. Powered and tested at our facility — confirmed GOOD on all output terminals; +5V measured 5.31VDC. Chassis shows surface oxidation and cosmetic wear typical of vintage industrial use. |
