Apple IIe Aftermarket PSU (Delta Electronics)

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Delta Electronics Apple IIe power supply (external)

This is the page for the Delta Electronics MW 302 AP aftermarket power supply for the Apple IIe

Power supply should normally output voltages specified on outer casing (+/-5VDC and +/-12VDC) in an unloaded condition.

Known Issues

Non functional / clicking when powered on

NOTE: Many Apple IIe power supplies (Astec branded) "click" when powered on if they're disconnected from the motherboard and will not provide proper output voltages when unloaded. Some, however, provide constant output regardless. Limited experience with aftermarket PSU's suggest a constant output is to be expected.


  • Blown / failed electrolytic capacitors


  • Replace electrolytic capacitors

Disassembly Notes

Seven screws to disassemble case. Will need to remove power switch from end to remove board from enclosure.

Desolder Line, Neutral, and Ground wires from NEMA plug connection to separate board from case completely.

Original Parts

Power Supply PCB

Underside stamped with "MW 302 AP". "Delta Electronics" name found on back of NEMA plug.

Table Notes

  • Capactiances are in microfarads (µF) unless otherwise noted
  • Dimensions are in millimeters (mm)
  • Temperatures are in degrees Celsius (°C)
Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Diameter/Size Height Lead Spacing Temp Type Brand
C! 1 0.1 250VAC 17.8 12.5 15.6 0 Film (PP) - X2 ISKRA
C2, C3 2 4700 pF 250VAC 13 11 10.5 0 Film (PP) - Y ISKRA
C4, C5 2 100 200 16.2 33 7.8 85 Electrolytic Jamicon
C6 1 100 25 6.6 11.6 3.4 85 Electrolytic N/A
C7, C8, C12 3 10 63 5.2 11.2 2.9 85 Electrolyitic N/A
C13, C14, C15, C16, C17 5 1000 16 13 25.8 5.8 105 Electrolytic N/A
C18, C20, C21 3 220 16 8.3 12 3.5 85 Electrolytic N/A
C19 1 470 16 10 15 5.4 105 Electrolytic N/A

Replacement Parts

Power Supply PCB

Replace original parts in kind. See Digikey BOM in Kits section for an example list.


  • Maintain lead spacing
  • Maintain / reduce diameter
  • Prefer 105 °C or greater temperature ratings.
  • Prefer low ESR caps for DC voltage output (C16, C17, C20, C21)

Basic PCB Name

RefDes Qty Compatible Part Number Order Links
C! 1 890324025017CS / MP2104K27D2R8LC DigiKey Mouser LCSC
C2, C3 2 CMPPAC310V472K10S5 / MP2472K27C2R6LC DigiKey LCSC
C4, C5 2 EKXJ251ELL101ML20S DigiKey Mouser
C6 1 25ZL100MEFCT16.3X11 DigiKey Mouser
C7, C8, C12 3 ECA-1JHG100I DigiKey Mouser
C13, C14, C15, C16, C17 5 16YXJ1000MT810X16 DigiKey Mouser
C18, C20, C21 3 860010373010 DigiKey Mouser
C19 1 16YXF470MEFCT810X12.5 DigiKey Mouser


Related Links