Solar timer (CB20498E)

This very low consumption circuit can be powered by a solar cell. The time indication is given by a microammeter.

Battery Low Indicator (CB4796E)
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
Photodiode Amplifier (CB905E)
The gain for this circuit is given by the ratio between R2 and R1. The circuit is suggested by...
Commercial Reflex Receiver (CB958E)
Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses...