Ultra low active cycle (CB9078E)

This astable multivibrator has an active cycle of 30,000: 1. We found it in a 1970 EEE. The components used are from that time.

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Triangular Generator LM3900 (CB15629E)
To obtain triangular signals, we have the circuit in the figure that uses two amplifiers. One of...
Limiter with zener diode (CB7054E)
This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very...
Audible Voltmeter (CB21395E)
This circuit was found in an American publication from 1969. Transistors are from the time and can be...