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The market has been inundated with cheap RC toys. Most of them use the RX/TX Integrated Circuits that have 5 to 9 functions:

All of them operate on an ON/OFF state.

Has anyone tried to feed a PWM signal to these and see if they have enough frequency output on the Receiving end?

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Are you trying to implement a poor-man's proportional steering / throttle control? – Dave Oct 2 '12 at 13:13
@Dave Yeap, you got it quite right. – Gustavo Carreno Oct 2 '12 at 13:17
@Gustavo, these parts sound quite interesting. I was just looking around but can't find them at my usual shops. Where do you buy them? – wollud1969 Jan 30 '13 at 14:11
@wollud1969 I've never got to the point of investigating a supplier. I've "sourced" mine from discarded cheap RC toys that I had laying around. – Gustavo Carreno Feb 19 '13 at 23:02
Technically, the answer is yes. The more important question is what the PWM frequency limit would be, with anything from perhaps half a Hertz to a few hundred being believable without consulting the data sheet. – Chris Stratton Apr 30 '13 at 14:45

The second of those datasheets talks about using a 1khz PWM signal internally for communicating, so I suspect transmitting PWM through them will not work.

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