This circuit of old medical documentation generates pulses in a ratio of 20 to 300 and duration of 3 ms. The circuit has biomedical applications and can use modern equivalent components.
This low voltage lamp flasher can be powered from 12 V supplies. Frequency is adjusted by P1 and...
The transistors in this circuit, found in an American publication in 1975, can be replaced by...
This circuit, from an old publication, can also use modern transistors. Note that the unit is...