[MRCA] DC-DC Up Converter

[Ray Fantini]

Just finished a DAG radio direction finder using this same converter. Its providing 90 volts and replacing a B battery. Built a small box that takes the output of a twelve volt SLA Battery and provides 1.5 and 90 volts for the direction finder. Found that the inverter was fairly quiet but is almost completely lacking any output filtering. It also produced noise on the input buss to the battery but keeping everything in a meatal box and short it was not an issue. Regulation was ok but did notice there are some points where the PWM system on the board will produce weird noise at some settings. Think the little inverter is good for low power things like replacing B Batteries but would not trust it for things like 225 B+ supplies in a big radio.

Ray F/KA3EKH


From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of MilRad via MRCA
Sent: Thursday, September 11, 2025 9:30 PM
To: Mark K3MSB <mark.k3msb at gmail.com>; ARC5 <arc5 at mailman.qth.net>; List Milsurplus <milsurplus at mailman.qth.net>; Military Radio Collectors Association (mrca at mailman.qth.net) <mrca at mailman.qth.net>
Subject: Re: [MRCA] DC-DC Up Converter


I have had good luck with this one.

https://www.amazon.com/dp/B09KRLGNH7
On 09/11/2025 7:39 PM EDT Mark K3MSB <mark.k3msb at gmail.com<mailto:mark.k3msb at gmail.com>> wrote:


Hi Folks

A while back (perhaps a few weeks)  there was a thread on DC to DC up converters in which there was one particular unit that quite a few people liked.

I thought I saved that info but didn't.  If anyone has the info, please forward.

Thanks

Mark K3MSB
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20250912/9a415d35/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DAG.jpg
Type: image/jpeg
Size: 143715 bytes
Desc: DAG.jpg
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20250912/9a415d35/attachment-0001.jpg>