Solar timer (CB20498E)

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

Heads and Tails (CB4559E)
This circuit was obtained from Everyday Electronics magazine of August 1974. The circuit is still...
Servo Amplifier (CB5374E)
The integrated circuit in this application is from the 80's, not being common nowadays. It...
Schmitt Trigger Oscillators (CIR089E)
The advantages of using Schmitt Inverters (74108) or Schmitt NAND gates (4093) in oscillators lie...