Found in a 1964 Electronic Design, this circuit uses a common LDR and transistors from that time. The relay is a high sensitivity type.
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...
This filter was obtained from a Linear Technology manual from the 1990s. The power supply must be...
Found in 1965 General Electric technical documentation, this half-wave circuit controls shunt type...