Frequency Doubler MC1595L (CB14589E)

We found this circuit in Motorola's Linear Databook in 1990. The component used is not common today.

Basic Operational Multivibrator (CB18990E)
This circuit was suggested by Texas Instruments in a manual of operational amplifiers. Other...
High power LED flasher (CB20944E)
Found in American documentation from the 1980s, this circuit shows how to use an LM3909 pulsator in a...
Digital LED Voltmeter (CB7385E)
This circuit was found in an Elektor from the 90s. The integrated circuits are not very common...