Cascading Zeners (CB21528E)

This circuit was found in a 1967 Motorola manual. Its purpose is to provide a very accurate reference voltage of 0.555V.

VLF Converter (CB26333E)
With this circuit, signals in the range of 10 kHz to 150 kHz can be received at close to 4 MHz...
Variable Threshold Limiter (CB19490E)
This limiting circuit with an operational amplifier has an adjustable cut-off point and can use...
Photo trigger (CB8281E)
Published by Philips in 1965 documentation, the sensor for this circuit is a common LDR. The...