Power Supply

CheshireNoir · 20-05-2022, 01:03 AM

While I was waiting to get back access to my main workspace, I was able to sneak in a bit of work on a little side project...
This is a 12v to 10v/5v adapter i've been working on. It's built around a 7805 for 5v (To power the Gotek) and a LD1085P for 10v.
There's a heatsink to keep everything cool and it should all fit nicely in a jiffy box.

This is the first step in me building a second PSU / video adapter for use with the DRAM system when it finally gets back on its feet.

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It's built into proto board, but I have been mulling doing a proper PCB for it, as 12v PSU are easy to get hold of. The power connectors are reverse protected so you can't put it in backwards.

Anyway. Just thought I'd share.

We'll see how it goes in "real world" testing :-)

Chesh

mjelic · 24-05-2022, 07:23 PM

What do you need the 10v for?

CheshireNoir · 24-05-2022, 08:39 PM

The Microbee itself. 10v for the Microbee, 5v for the external Gotek.

someone · 24-05-2022, 09:23 PM

(24-05-2022, 08:39 PM)CheshireNoir Wrote: The Microbee itself. 10v for the Microbee, 5v for the external Gotek.

Why not make 10V/8.5V switchable? This'll stress the microbee less.
Switch to 10V if using the Serial port otherwise just use 8.5V.

Someone has been known to successfully use recycled Sony Playstation 2 power bricks regulated 8.5V @ 5.65A.
Make the planet greener - repurpose old power supplies! Smile

Ernest · (This post was last modified: 24-05-2022, 11:10 PM by Ernest.)

As long as they are aware they may need to trim the RESET circuits with such a large change from 12 Volts down to 8.5 Volts.
Especially with the early units as the old caps start to get flaky.
But well worth the effort to reduce the amount of heat generation in those poor regulators.

Ernest