Useless Box SPDT

256

03:18:18

Analog circuit for a Useless Box.
https://www.youtube.com/watch?v=aqAUmgE3WyM
Employs a single SPDT toggle switch and a couple of NPN bipolar transistors to reverse the polarity to the motor to change the direction of rotation.
A limit switch is included to stop the motor once the arm has retracted inside the box completely.
Also added a LED that will illuminated while the motor is running in either direction and is coupled with a capacitor to smooth out any voltage irregularities caused by the motor.

Not sure why the simulation doesn't show the motor spinning when it appears that the electron flow is correct.

published 4 years ago

wyoelk

4 years ago

There is insufficient starting current. Motor is set at 2A and only getting 29.6 ma.

MakotoNinja

4 years ago

Ah, makes sense. Thank you.

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