RC2014 power supplies

[Chris Murphy]

Hi all, just got my RC2014 Zed Pro up and running.  I installed a 7805 regulator on the backplane but as I contemplate adding more modules I'm thinking I may want a heftier supply.  Any particular favorites out there?

-Chris

[Jeff Ratliff]

Search for threads about 7805.  They get really hot because they waste a lot of power. Most people recommend getting one of the many switch mode replacements that stay cool but still do the job. 

The one I got was  a OKI-78SR-5/1.5-W36-C, but there are plenty of others. 

The supply you get will depend on how much current a Zed Pro draws, so hopefully someone else knows that number.  I just used a 9 volt wall wart to power my CP/M upgraded Classic II. I think it puts out about an amp.

[Spencer Owen]

An amp at 9v sounds way too high!

I am currently running some tests on a well loaded up RC2014 Zed Pro (with CF card, RP2040 VGA, LCD display, front panel and a bubble display module). That's being fed from a 5v USB wall wart and the maximum it is pulling is around 120ma (0.12 amps). It is mostly below 100ma.

Spencer

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[Chris Murphy]

Impressive how low the current draw is!  I’m assuming there is a keyboard plugged into the VGA module?  

Looks like I have nothing to worry about moving forward. 

-Chris

On Jul 4, 2024, at 10:40 AM, Spencer Owen <spe...@z80kits.com> wrote:



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[fixit9660]

Hi Chris. I recently equipped my SC503-based system with a Vigortronix VTX-146-015-118 Toroidal Transformer feeding three AC TO DC LM317 / LM337 Adjustable Positive / Negative 1 Amp Regulated Power Supplies. It IS overkill as someone is sure to point out, BUT I don't intend ever revisiting the power issue in the future, no matter what I want to plug in. They are currently supplying +/- 5v, +/- 12v, 3.3v and 21v but as they are adjustable that is completely flexible. The only supply I'm using at the moment is the +5v and the regulator does get warm. I intend my system to be standalone, so it will be powering a monitor of some type in the future, as well as other things.