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In lugnet.market.buy-sell-trade, Wayne Jackson wrote:
> Mathew Clayson wrote:
> > The next problem is the diodes that are used to convert the AC output of the
> > transformer to DC, and the voltage regulator. The diodes supplied are rated at
> > 1Amp average current. With an AC supply these should be fine up to 1.5 Amps as
> > they are off more then half the time. The regulator chip (lm317) is rated at 1.5
> > Amps. But the heat sink is most likely insufficient for that if you are running
> > continuously.
>
> I am not sure if it would work, but it may be possible to use a power
> transistor to increase the amps.
>
> The heat sink will need to be upgraded to a larger size, and a fan will
> definitely need to be installed to compensate for not just the
> regulator's heat, but that also of the transistor.
>
> A reference that I looked at:
> http://www.zen22142.zen.co.uk/Circuits/Power/boosti.htm
>
> It is for a fixed voltage, but may work for variable.
>
> Then there is always the home-brew controller.
True,
but you still have to upgrade the diodes, capacitor and the power supply. As
well as adding more heat sinking ability. And the 3 amp version of a LM350 can
swap right into the original socket of the LM317, and still provide full
overcurrent/overheat and short circuit protection. And at around $1.25 it's a
small part of the cost, particularlly compaired to the cost of a 3 amp power
supply.
Mathew Clayson
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