Long maintenance circuit (CB8866E)

A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The integrated circuits used are uncommon today.

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4mA at 20 mA Generator XTR115 and PGA309 (CB15571E)
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...
Pressure Transmitter (CB18764E)
This circuit with an industrial standard 4-20 mA interface uses a KPZ20G pressure sensor but can...
Simple 1-transistor oscillator (CB23615E)
This circuit takes advantage of the inductance of the coil of a high-impedance phone to form the...