dog repellent

150

02:50:53

https://www.schematics.com/project/dog-repellent-ultrasonic-circuit-11096/

published 6 years ago

fatcat2

6 years ago

What purpose does that transformer serve there? Instead of that, you may use a separate inductor for filtering out the fundamental.

al3ph

6 years ago

square to sine wave

fatcat2

6 years ago

Instead of that, you may use a separate inductor for filtering out the fundamental.

al3ph

6 years ago

it does not seem to have the same effect. Care to elucidate?

fatcat2

6 years ago

👉http://everycircuit.com/circuit/6370641794826240

fatcat2

6 years ago

That means your version is much better. Still, I don't understand what the transformer does there...

al3ph

6 years ago

How about this: https://everycircuit.com/circuit/6060504706187264

al3ph

6 years ago

Much higher inductance.

fatcat2

6 years ago

Yeah. I also thought of using an underdamped LC LPF but I was too lazy. I like low inductance values so that the relatively high capacitor values would increase the selectivity.

fatcat2

6 years ago

The main problem that I understand it's that the 555 timer output distorts at about 80mA

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