LED Photo Flasher (CB20948E)

This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The circuit is from an 80's Popular Electronics.

8 Bit DA Converter (CB5171E)
This circuit of the 80's makes use of components of the time. The circuit is from an American...
Simple Diodes Tester (CB1498E )
With this circuit general purpose diodes and rectifiers can be tested with ease R has 100 ohm for...
High Input Impedance Amplifier (CB978E)
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...