This circuit is from 1968 American medical documentation. The circuit generates pulses of excitation that are applied to the patient's heart. The components are from the era. The pulses are 1 ms.
The gates of a 4093 can be used form a two-tone siren as shown in the configuration of Figure. The...
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...
This oscillator appeared in the September 1950 Radio Electronics magazine. The frequency is...