Solar-powered motor runs on 10 nA


Posted on May 3, 2012

Designs for solar-powered applications with low-duty-cycle requirements can often rely on capacitors for energy storage in place of less reliable batteries. Typical applications include solar positioning, telemetry transmitters, chemical pumps, data loggers, and solar-powered toys. The circuit in Figure 1 can run a small pager motor from the output of a small calculator-type solar cell in near darkness. The circuit works by repeatedly charging a 4700-µF capacitor, C1, to 1.75V and then dumping the charge into the motor.



Only the self-leakage current of the solar cell limits low-light operation. The circuit itself has such low leakage currents and trigger-current requirements that it can run the motor on 10 nA of current if you use a low-leakage energy-storage capacitor.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Single-channel remote control
Modular Phono Preamplifier
220 Volts Flashing Lamps
Electric Fence 20KV pulses for perimeter defense
Ultrasonic Movement Detector
Flow DC solenoid circuit operation



Top