Model speed control (CB5375E)

This circuit is from an 80's documentation. The BC108 can be replaced by the BC548 and the 2N3055 must have a heat sink. The pot is wire wound.

Light Activated Relay (CB948E)
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....
Current Sensor with Optical Isolator (CB5229E)
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...
Touch Triggered Flip Flop (CB143)
The 4093 or any other NAND gate can be used for the very sensitive configuration of a R-S...