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.

126 MHz Logic Probe (CB21195E)
This logic probe was found in a Popular Electronics from the 90s. The circuit is TTL and must be...
Comparator for TTL (CB20142E)
The integrated circuit used in this configuration is not common today. The zener determines the...
Bipolar Transistor Crystal Pierce Oscillator (CB13084E)
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...