[Coco] (no subject)

[Steve Pedersen]

Howdy Frank,
I was looking at this buck converter

https://www.amazon.com/DROK-Converter-Step-down-Regulator-Stabilizer/dp/B01MT8BBC1/ref=sr_1_6?ie=UTF8&qid=1511030012&sr=8-6&keywords=buck+converter

On Sat, Nov 18, 2017 at 5:14 AM, Francis Swygert <farna at att.net> wrote:

> The Power Supply Repair section of "Tandy's Little Wonder" (starts on page
> 89, http://sparksandflames.com/files/TandysLittleWonder-2nded.pdf) has
> the connections for a standard PC power supply. These can also be used to
> supply 5V DC directly to the motherboard. You would need a 5V regulator but
> could otherwise run directly off a 12V battery. That would greatly increase
> battery life over using an inverter. Some have made totally portable CoCos
> this way. I seem to recall that you lose the RS-232 port unless you have
> both +12V and -12V though, at least on the CoCo1. I don't think you need
> 12V on the CoCo 2 and 3, but would need -5V for the RS-232 to work... don't
> really remember. The text isn't clear on this, but just gives voltage
> requirements for +5V and -5V for the 2 and 3... but also shows where to
> connect a PC power supply's +12V and -12V. If indeed you just need +/-5V a
> couple small regulators with heat sinks is all you need for a PS that will
> plug into your cigarette lighter. It should carry 3A (CoCo 2/3 requires
> 2.1A total) with no issues. Then you just have the TV/monitor drawing on
> the inverter... but many of those use an external brick power supply of
> 12V...
>  Frank Swygert
>  Fix-It-Frank Handyman Service
>  803-604-6548
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>



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