This circuit lets an external 12V SLA battery power a camcorder which
normally has an inbuilt 7.2V battery. Such batteries can now be very
difficult or expensive to obtain for earlier model camcorders. In
essence, the circuit is a standard LM317 adjustable regulator with
resistors R1 & R2 set to provide 7.2V (depending on the accuracy of
the 1.25V internal reference). If the resulting output voltage is low,
it can be increased by reducing the 130 resistor and vice versa. The
circuit can be assembled on to the Eliminator PC board or the simple DC
power supply PC board. The regulator should be fitted with a flag
heatsink. Note that the circuit should be disconnected from the battery
when not in use, otherwise its quiescent current (from the LED and
regulator) will flatten the SLA battery.
Tidak ada komentar:
Posting Komentar