Amplitude Modulation and Demodulation

* Mixing with a diode and LC resonance circuit * Demodulator with full wave precision rectifier * Receiver cut off frequency @ 1 kHz (2nd order butterworth) Credits: Thank you @hurz for providing a much improved mixer circuit. Link below. http://everycircuit.com/circuit/6159942510968832 Texas Instruments Precision Full-Wave Rectifier Notes: To be able to see the interresting stuff, the "carrier" frequency of 20 kHz is very close to the modulation frequency 1 kHz. This is not a desired case in real life, but I believe it works in the example. The output of a demodulated AM signal, opposite that of a demodulated FM signal, varies with the amplitude of the received signal. Try adjusting the potmeter. My other designs: Colpitts Oscillators http://everycircuit.com/circuit/6472095956729856 Binary LC Filter Bank Oscillator http://everycircuit.com/circuit/5849640909144064 LC Filter Bank Oscillator http://everycircuit.com/circuit/6141020952854528 RF Up and Down Mixing http://everycircuit.com/circuit/6321309163454464 DC Motor Rev. Sliding Mode Controller http://everycircuit.com/circuit/5398415189213184 DC Motor Revolution Detector http://everycircuit.com/circuit/6753368923176960 Boost SMPS Unlimited Voltage Build Up http://everycircuit.com/circuit/6448454909034496 High Power Charge Pump w. Mosfets http://everycircuit.com/circuit/5016778832084992 Transformerless 230 Vac to 10 Vdc http://everycircuit.com/circuit/4981362800197632 Motor Revolution Controller http://everycircuit.com/circuit/6424781689978880 Motor Current Sliding Mode Controller http://everycircuit.com/circuit/5502940846751744 ΣΔ ADC w. Result Displayed http://everycircuit.com/circuit/4549196269223936 300W Class D Amplifier w. Mosfet output http://everycircuit.com/circuit/5452375043342336 Three Phase Star Δ Safe Relay Wiring http://everycircuit.com/circuit/4748634531037184 Accidental 555 High Voltage Generator LOL http://everycircuit.com/circuit/5057154477457408

published 7 years ago