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Audio Power Meter - EEWeb
https://www.eeweb.com/audio-power-meter/
Audio Power Meter. This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of about 1 watt. At 1.5 watts it glows orange and above 3 watts it is bright red. The circuit is connected in parallel with the loudspeaker connections and is powered from the audio signal.
An Audio Tone-Shift Power/SWR Meter
https://www.arrl.org/files/file/Technology/tis/info/pdf/7909028.pdf
PowerlSWR Meter Adjusting a pi network or an antenna-matching system requires visually handicapped amateurs to have a "third hand." This modified SWR indicator is an answer to that oscillator chip, I determined that this IC was well suited to my plan. Although the specifications for the 566 call for a 12-V supply, by playing with a half dozen of
CB/High-Frequency Ham Power SWR Meter - RadioManual
http://www.radiomanual.info/schemi/ACC_instrument/RadioShack_SWR_PWR-meter_user.pdf
meter. 2. Plug the coaxial cable into the radio’s antenna jack and into . TRANSMITTER. on the back of the meter. CALIBRATING THE METER/ MEASURING SWR. 1. Turn on your radio. Then set . FUNCTION . on the front of the meter to . CAL. 2. Select a channel or frequency on your transmitter and hold down its transmit key. Do not speak into the micro-phone.
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