[AusNOG] Positive ground

Two Fat Monkeys - Dirk Bermingham dirk at twofatmonkeys.com
Thu Jun 25 18:48:19 EST 2020

Hi Rhys,

This reminds me of what we used to do in vintage cars with positive ground electrics...

A 24V/48V dc/dc converter will do the job giving you an 'inverted' +24V DC potential whilst still maintaining proper grounding, the principle is well articulated here, https://mgaguru.com/mgtech/electric/et207.htm  just in reverse in your instance. Check out https://www.powerbox.com.au/dc-dc-converters/dc-dc-converter-eta-pbih for a suitable converter.

Hope this helps,



From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Rhys Cuff (Speedweb Internet)
Sent: Thursday, 25 June 2020 5:19 PM
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Positive ground

Hi Group

We just purchased a radio transmitter that requires Positive Ground.
We normally power with a Netonix but the Pin out is different so that's a no go.

I can power with DC cable, problem is the unit is positive ground,  everything else is negative ground.
It's an off grid site, all 24v dc

What are my options for powering this?
I "Think" I can just use an isolated DCDC converter but don't want to risk letting the magic smoke out.

Thanks  for any help.


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