Team BeligerAnt's Tech Talk

Servos

(There will be more to come on this page - be patient! - but for now...)

A Simple Servo Tester

Here is a circuit of a simple servo tester that I designed. It's easy to build and is useful for testing servos or anything else that can be plugged into a servo socket of your receiver - R/C switch, ESC, RefAnt's counter(!) etc.

U1 is a 555 timer IC, U2 is a 74HC04 (or 74HCT04, 74HC14, 74HCT14), U3 is a 7805 5V regulator (a 78L05 would be OK). Resistors are all 1/4W, 5%. Capacitors C2 and C3 should be 10% tolerance. You MUST use a linear pot'!

If your servo (or whatever) doesn't like the maximum (or minimum) pulse width, it may be too long (or short). The simplest solution is to avoid turning the pot' right to the end of its travel!

Click here for the schematic