Put together a dual-555 circuit in LTSpice to generate a 40 kHz pulse train with a 10 us pulse duration and 25 Hz repeat rate. No Arduinos here!
Schematic without output transistor
Period between pulse trains
Pulse train duration
![](https://cdn.hackaday.io/images/6146921614828906169.png)
Pulse train frequency
![](https://cdn.hackaday.io/images/357361614828769485.png)
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