A Simple Switch for R/C Models

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< PIC Assembler, PIC Basic, PIC-C ~ A Simple Switch for R/C Models

eric

Posted: Mon Aug 28, 2006 11:05 pm Post subject: A Simple Switch for R/C Models

Site Admin Joined: 01 Jan 1970 Posts: 311

width of around 1–2 ms. This is the usual frequency for R/C
model remote control units, even though some manufacturers
(Simprop) prefer 40-Hz signals. After being smoothed
by a filter (R1, R2 and C1), the signal arrives at the noninverting
input of the opamp, which is wired as a comparator.
The other input of the comparator is connected to a reference
voltage that can be adjusted using P1. If the reference
voltage is lower than the rectified PWM voltage, the
comparator output goes High, FETs T1 and T2 are switched
on and the motor runs. R4 provides hysteresis to prevent
the comparator from responding to every minor fluctuation
in the voltage on the non-inverting input. The comparator
output will only return to Low when the signal

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