Multiplexed BCD Driver (CB20908E)

This circuit was found in an Electronics Now from the 80's. The circuit is designed for 3-digit displays. The circuit is TTL.

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Undervoltage indicator (CB9131E)
Found in National Semiconductor documentation from the 1980s, this circuit uses an operational...
2M voltmeter (CB22051E)
This basic voltmeter circuit has an input resistance of 2 M. The instrument is 100 uA and the...
Residential Alarm (CB9884E)
This simple alarm using only transistors was found in a 1990 publication. It can be powered by D...