abdou,
for example if you want to generate a 5Khz (output from 4017), you need to feed the 4017 (pin 14) with an oscilator frequency of 20Khz.
The VR1, regulate the output amplitud.
perfect, yes there is a wireless connection between mini coil and phone , good idea to have a stable frequency with the phone, but is there a duty cycle command in your phone software???
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