Solar radio (CB20485E)

This circuit is from a 1991 publication. The integrated circuit used is an integrated radio from that era.

5 V zener diode with Transistors (CB20459E)
In the absence of a 5 V zener diode, we can create an equivalent configuration with two...
3 V White Alternating LED Flasher (CB20427E)
This circuit is powered by only 3 V and can flash white LEDs from 3.2 to 3.6 V, as it includes a voltage...
1.2V Voltage Termination (CB4904E)
This circuit was found in a Linear Technology manual from the 1990s. The circuit makes use of the...