Electronic – Is there such thing as a PWM Transistor

pwmtransistors

I have a 7-channel RC receiver that outputs PWM at 5V. One of the channels is controlled by a simple switch (on/off) on the transmitter.

I'd like to use this switch to control a 24V device. The problem is that this device only accepts binary input (no PWM). Even when the PWM is considered "off", there is still that little spike on the oscilloscope, and "on" just has a wider spike (which, as far as I know, is how PWM is designed).

Is there such thing as a transistor or transistor-like device that can interpret a PWM signal and open/close a "collector" and "emitter" based on the width of the pulse in a PWM signal?

Disclaimer: I am not a professional electrical engineer. There may be a simple answer in front of me that I'm not aware of.

If I'm not providing enough information, let me know.

Best Answer

A PWM with 0% period should be completely off, no spikes. A simple ADC could help with PWM to Digital.

The problem is that while your RC receiver says it's just PWM, it is not. It's a specific protocol that works slightly different. Essentially, it is a PWM signal with 1ms to 2ms pulses at 50hz. A centered pulse is neutral. Even with a push button and not an analog stick, the protocol stays the same.

I highly doubt there is a transistor that does what you want, you would need a custom design or a microcontroller to do what you want. Simple enough to do, read an analog input, determine what the pulse length is, and output to a digital pin the state.

This question is about reverse engineering a product that does just that: Nano Electric Receiver Switch - Circuit Components You may want to read it hint hint