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TR4/4A TR4 Bendix Radio

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TR3driver said:
Another alternative, if you are so inclined, might be to buy or build a DC-DC converter that would put out -12v. I've not actually gotten into it (yet), but there are all sorts of ICs these days for building switching power supplies. Add a suitable transformer, power FET & flyback diode; shouldn't be too hard to build something.

Here's one that might be suitable, sells for about $30 @ Mouser:
https://www.murata-ps.com/data/power/mdc_uei-15w.pdf
Click to expand...

Randall: I assume that this (Murata) module will require proper (electrically isolated)heat sinking.

Here is something else for the average TR enthusiast who may not want to delve into component level electronics.

https://www.mgaguru.com/mgtech/electric/et207.htm

converter2.jpg


and this: https://www.powerstream.com/dc24.htm

Regards,

T
 
lbcs_r_fun said:
Randall: I assume that this (Murata) module will require proper (electrically isolated)heat sinking.
Click to expand...
I don't believe so. The specifications only mention "adequate air flow", there is no mention of a heat sink requirement. Since those modules are only rated for 15 watts of output (just barely enough to run the radio), they only have to dissipate a couple of watts of heat.

<div class="ubbcode-block"><div class="ubbcode-header">Quote:]
and this: https://www.powerstream.com/dc24.htm
[/QUOTE]
I don't see anything there that would be suitable; note the line that says they all have common grounds (and none of them specify -12v input).
 
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