Digital LED Voltmeter (CB7385E)

This circuit was found in an Elektor from the 90s. The integrated circuits are not very common today.

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Third Brake Light (CB4783E)
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
Transmitter for of 15-meter range (CB20400E)
I found this little signaling transmitter in old American documentation. The circuit has a good...
Amplifier for microammeter (CB3927E)
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...