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For various reasons, I am trying to emulate the function of a servo control board, insofar as the application will be only for motor speed and direction control via one pin and a pwm input- essentially, I'm trying to make a tiny motor driver compatible with inputs via a picaxe servopos command.

(I think there's lot of other potential applications here, but this is where I'm at for now).

I have a quesiton for the wiser people with more time than I do.

I am  driving a small pager motor with a PWM signal from a RC+inverter system (similar to a "neurone" in a beam bot with the output forming its own input, or even a "solar theremin" curcuit).The signal is modulated via a resistor+LDR to change the frequency of the signal pulses and piped off to drive a tiny motor. If necessary, with a bit of amplification.

Hello people.

update:

The problem, as always is situated between the chair and the keyboard.

Telefox mentioned that a pizo is actually capacitor-like, not resistor like as I had assumed. The diode therefore, prevents the pizo from discharging. A proposed solution was to buffer the pizo with a transistor and pulldown resistor, or a double transistor (i.e an inverted inverter), with a pull up. 

I'll try these, and see how it all works out. 

original post:

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Okay so I got a few new futaba s3003 servos cheapish, and while I'm looking around on other sites to see some prices, I notice that somone left someon else some negative feeback for the servos they bought, claiming that they were not legit futaba servos.

Not knowing a lot about futaba, I'm not entirely sure if I have real futaba servos - at this stage, they were so cheap it hardly matters, but for future reference - how does one spot a fake?