HFU HF Underground

Technical Topics => The RF Workbench => Topic started by: ThaDood on December 20, 2025, 1737 UTC

Title: The PWM Amplifier Circuit? Looks easy enough.
Post by: ThaDood on December 20, 2025, 1737 UTC

https://www.circuits-diy.com/pwm-amplifier-circuit-ca3130-cd40106/    Hmmmmmmmmmmm... 700kHz from their example? Perfect, to boost like a 100mW for an AM Carrier-Current setup. (FWR by Boomer to me.)

Title: Re: The PWM Amplifier Circuit? Looks easy enough.
Post by: redhat on January 05, 2026, 1253 UTC

This is a self-oscillating PWM amplifier.  Don't count on the switching frequency being stable, as load profile will change the switching frequency (along with the wind, moon phase, etc).  These are my least favorite of the class D variety, as they can be very finicky and ill behaved.