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555 timer and servo help? Answered

Hello,

I just finished building this instructable: https://www.instructables.com/id/The-Most-Useless-Machine/step6/Original-Design-Using-555-Timer/

However, I have run into a couple of problems with the 555 timer and the servo. As suggested by someone in the comments section of that instructable, when the server turns on it is consuming enough current to drop the voltage enough to mess with the 555 timer's PWM output (I do not have an oscilloscope, so I can't really prove this).

Whenever the servo starts, it works properly for a couple of seconds, then it starts acting very strange, stuttering, going the wrong direction, ect...

I'm thinking if I add a capacitor the the power source, it will help stabilize the voltage, but i'm not sure if this will work. Any help and/or suggestions would be greatly appreciated.

Circuit is running at 6v (4AA cells)
Servo runs at minimum 4.8v to max 7.2v

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hp07

Best Answer 5 years ago

I don't think capacitors will be of much help. But use an op-amp voltage follower circuit. It will be able to drive the load without affecting the 555.

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iceng

5 years ago

A simple servo tester.

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