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.

Four-Transistor Timer (CB1261E)
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
Video amplifier (CB9413E)
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
Weak Signals Sensor (CB6409E)
Found in a 1968 US publication, this circuit is designed to measure very weak signals. The...