If I remember correctly 78xx series have a thermal shutdown. They are rated
for 1.5A. At this current and 24V supplying it, you will have:
Power= 1.5x(24-5)= 28.5W
Ensure you have a BIG heatsink or proper ventilation.
Use a linear series regulator to drop the voltage to something around 8V and
put the regulator after it. It will be more reliable than a simple
transistor and a zener in a series regulator.

Marcelo Y.

> Does anyone know of a high-current drop-in replacement for a 7805/06
> voltage
> regulator ? My 7805 simply can't give me the required current at Vin = 24
> Volts. I've heard about switching regulators but have never used them. Do
> they require more external components than linear regulators ?
>
> regards,
>
>
> __________________________
> Tobie Horswill
> thorswil@exmachina.qc.ca

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