Found in an Electronics Now from the 1980s, this circuit uses some components that are still common today. For others, equivalents can be tested.
This circuit of old medical documentation generates pulses in a ratio of 20 to 300 and duration of 3...
This circuit with a supply voltage of only 2.5 V was found in a 2005 Linear Technology...
Microchip Continues Expansion of AVR Microcontroller Product Line with Addition of Three New...