49
Circuit 24:
Solar light with battery
Setup information
Install the two diodes as shown in
Fig. 2.24.
Then install the resistor and connect the two AA battery
holders. Finally connect the solar cell. Check the placement on the board again and only then connect the
rechargeable batteries.
Components required:
1 x solar cell, 1 x red LED,
1 x BAT 85 Schottky diode,
1 x 220
Ω
resistor,
1 x breadboard, 2 x NiMH bat-
teries with AA battery holders
Fig. 2.24:
Solar light with battery
Experiment
Free solar power is convenient only if it is always available – meaning, whenever there is demand, not just
when the sun is shining. A simple approach is using batteries. Whenever the sun is shining, the battery is
being charged. The stored electrical energy can then be recovered at any time.
When the circuit starts and the batteries are empty, the red LED remains dark at first, also, when the sun is
shining. The solar cell will initially charge the batteries. Once the batteries have a sufficient charge, the LED
will glow steady, regardless of whether the sun is shining or not. As explained in the previous experiment,
you could charge small devices instead of the LED with your free energy.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
