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 oscillator of this circuit operates around 8 MHz, but the output will be at a frequency three times...
This very low current circuit with the ICM7860 was found in the April 1995 Electronics Now...
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...