Servo tester circuit variations

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1

Hi all,

I just built a simple servo tester and have it working properly, but I have a few questions. I was contemplating the three attached circuit designs, and ended up going with the third one since it is the simplest. I didn’t use the second capacitor off pin 5, or the transistor. So my first question is if there is any reason I need either one. I am not driving a servo, and simply need to generate a PWM signal.

I tested different input voltages ranging from 5-7V and ended up with slightly different pulse width values. I was surprised by this since a commercial servo tester uses a range of input voltages. Should the pulse width change with varying input voltage?

Please pardon my ignorance.

Thanks for any guidance,

Troy

2

I know I’m not answering your question but, what program are you using to create the wiring diagrams???

3

I found these wiring diagrams online.

4

Oh

5

Is there any way to illustrate these diagrams in a 3D model to make it more easy to understandable…any idea?

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