Hi,
I am working on a circuit that involves an audio signal (microphone, preamp, mixing, output, etc.) as well as a motor (that drives a tape deck). My question is, what is the proper way to separate the motor circuitry and subsequent noise (it is driven by PWM) from the audio signal circuitry. As it is now, the motor noise is quite audible on the audio signal, which I assume is because they share the same ground.
I am currently taking power from an AC transformer and running it through a basic rectifier/smoothing circuit (just 4 diodes and a capacitor). Would it be sufficient to use the same AC transformer, but use two separate rectifier/smoothing circuits to create isolated grounds for the motor and audio signal?
Thanks for any help. I've been doing electronics for a few years, but am still quite new to it, and really know nothing of power supplies.
Thanks,
Dan
I am working on a circuit that involves an audio signal (microphone, preamp, mixing, output, etc.) as well as a motor (that drives a tape deck). My question is, what is the proper way to separate the motor circuitry and subsequent noise (it is driven by PWM) from the audio signal circuitry. As it is now, the motor noise is quite audible on the audio signal, which I assume is because they share the same ground.
I am currently taking power from an AC transformer and running it through a basic rectifier/smoothing circuit (just 4 diodes and a capacitor). Would it be sufficient to use the same AC transformer, but use two separate rectifier/smoothing circuits to create isolated grounds for the motor and audio signal?
Thanks for any help. I've been doing electronics for a few years, but am still quite new to it, and really know nothing of power supplies.
Thanks,
Dan