You might want to look into the Linear Technology LT1074 IC. If you don't
need more than 5 amps, these devices are great. I've designed power
supplies to put out 5, 12 and 16 volts at 5 amps with the input voltage
being varied from 3 to 40 volts. The output stays stable; of course, at
voltage inputs lower than the output voltage, the input current goes up
proportionally for a
given output current.
73, Zack W9SZ
On Tue, 27 May 2003 kr7o@vhfdx.com wrote:
> I am looking at incorporating a 10w Avantek 5.7G and one of the 3.4G
> Toshiba amps into my portable microwave station and I am curious as to what
> other people are using for regulated supplies for the odd and in some cases
> fairly critical voltages needed to power these amps. In the case of the
> Avantek, I am talking about the modified units requiring +10.5v and -12v,
> and of course the 12.6v for the Toshiba amps.
>
> For portable operations I typically use two 12v deep cycle batteries that
> will range in voltage between 11.5v and 13v over the course of the
> discharge cycle. -12v shouldn't be a problem, but I haven't found zeners
> or other voltage regulators of the proper voltage and current ratings for
> the other voltages. 12.6v is even more of a challenge without some sort of
> DC-DC converter (but again I haven't found any surplus converters that
> match the needed conditions).
>
> I could always build an AC power supply for the proper voltages, but then I
> need to carry a potentially noisy inverter (and the overhead necessary to
> power that). Resistive voltage dividers are a possibility, but still do
> not provide the level of regulation that appears to be needed to protect
> these devices, and also waste precious battery stores.
>
> So, what is everyone using to supply these amps. Hopefully I am missing
> something simple here.
>
>
>
>
> 73, Robert KR7O/YB2ARO, DM07ba/OI52ee (ex. N7STU)
> kr7o@vhfdx.com
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