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EE question: convert RS232 voltages to RC servo
Looking for EE's to comment please. I want to convert a -12V to +12V PWM signal to RC servo voltage levels (0 to +5V), with sufficient current to reliably drive a Victor. I cannot locate any specs for the Victor's input impedance and required minimum input voltage. I'm thinking a simple circuit like this will do the job. The questions I have are these: - Is 1200 ohm a small enough output impedance to reliably drive the Victor's input? - Is the 2.7MegOhm small enough to allow the 12V input to drive the 2N3904's base? - Will the transistor operate as desired (i.e. shut off) with a -12V signal at the base, without damaging the transistor? - Will these resistance and voltage values keep the 2N3904 within a safe operating range ? Last edited by Ether : 18-06-2012 at 22:04. |
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