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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Step Down Switched Regulator (CB5452E)
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...
Simple 9V Power Supply (CB4367E)
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
Oscillator (CB7096E)
This circuit from Popular Electronics powers a small speaker. The transistor can be of general use...