Temperature Sensor (CB6022E)

This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon today, but the diagram is for reference only.

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Digital LED Voltmeter (CB7385E)
This circuit was found in an Elektor from the 90s. The integrated circuits are not very common...
Preamplifier for Low Impedance Microphone (CB928E)
With this circuit, a well known configuration, small speakers and even low-impedance headphones...
Night switch (CB7189E)
Found in RCA documentation two years 70, this circuit triggers an incandescent lamp at dusk. The...