[ARC5] [Boatanchors] Those +/- 48 Volt DC-DC Converters

[Jim Wiley]

How about using a input fuse followed by a 10-watt or so Zener diode 
across the DC input?  Simple, and the blown fuse gives an indication of 
what happened.  A "resettable" fuse can be used to avoid the cost of 
replacing blown fuses.

More complex DC clamping / instant disconnect circuits using power FETs 
can be added depending on the level of protection desired.  Not all 
solid state stuff is sinful!   Such circuits can simultaneously protect 
against reverse polarity, over voltage, and over current.

Such circuitry can be a good investment for any sort of antique 
electronics to protect irreplaceable parts.

- Jim, KL7CC


On 1/2/2014 12:38 PM, David Stinson wrote:
> Concerning those DC-DC converters that make good
> 100 Volt DC supplies-
> I've learned "the hard way" that they don't like to be surged
> on the input.  I "bobbled" 24Volts on the input and blew one, probably 
> because of the filtering inductance
> on the ARC-5 receiver A+ buss.
> Filter caps on the input?  Back-bias diode like with a relay coil?
> Any other simple ideas on protecting the inputs from intermits
> and surges?
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>