PS-28S
The PS-28S is a switch-mode power supply designed to be a replacement for the PS-28U and its predecessors.
The PS-28S comes with the necessary hardware to mount to a universal IMSAI 8080 base plate (most systems produced),
or the original mounting hardware may be used.
The wiring connections to the output voltages are in the same place as the PS-28.
The board length is slightly shorter than the PS-28 to accommodate the newer cabinet rear frame with power entry modules.
The PS-28S can be supplied with any AC mains voltage from 100 to 240 volts, 50Hz or 60Hz, single phase.
The PS-28S can deliver more power with less voltage variation than the PS-28U. It runs cooler.
It is lighter and poses less of a structural risk to the system should it suffer a kinetic event.
Since most modern cabinet configurations include a DC fan, a dedicated +12VDC fan connector is provided.
Complete Kit
Order from the list below. The kits are complete with everything you need except solder and tools.
| Description | Part Number | Availability | Unit Price (USD) |
PS-28S complete kit with manual | PS-28S | 2/15/2025 | $299.00 |
Bare Board
You may order a bare printed circuit board for you to use your own parts.
Be advised that individual parts are not available to bare board customers unless they are explicitly in the parts list below.
| Description | Part Number | Availability | Unit Price (USD) |
| PS-28S bare board | PS-28S-BB | 2/15/2025 | $30.00 |
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