Amplitude Modulations


 Circuit / Schematic diagram of  Description
Oscillator / Transmitter  

4 MHz amplitude modulated Oscillator

Output level can be raised by biasing the audio amplifier's output stage to a higher voltage.

AM Oscillator for wireless headphone  
High Frequency Source Frequency source based on Saronix oscillator.
AM Transmitter Transmission range 500kHz to 1600KHz.
Limiting amplifier forms AM modulator  
Powerful AM Transmitter Range of transmitter is 2 Km
AM/FM Simultaneous transmission Based on digital IC 4001
AM DSB Transmitter for Hams The effective output of the circuit is three times that of an equivalent AM transmitter.

AM/FM/SW active antenna

This circuit is designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios.

AM Loop Antenna Uses the resonant properties of an inductor and a capacitor connected in parallel to receive weak AM stations.
Medium Wave active antenna The circuit amplifys the input from a telescopic whip antenna.
RF Amplifier for external antenna  
AM RF amp for internal antenna AM Booster for clear reception.

AM Radio

FM receiver with audio amplifier.

40 meter Direct Conversion Receiver One can listen to amateur radio QSO signals in CW as well as in SSB mode in the 40-metre band.
AM Receiver Simple receiver with three NPN transistor
AM to FM Converter The circuit helps to listen AM station on a FM radio.
AM receiver Receives the AM signal at 118.250MHz the same frequency as used in aircraft communication.
Portable AM Receiver this receiver covers the medium wave band band from approximately 550 to 1600 KHz

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