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AM (Amplitude Modulation) Circuits Last Updated on:
Sunday, November 01, 2009 05:06 AM
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
4 MHz Amplitude Modulated RF Source - A while back I needed an amplitude modulated
signal source at 4 MHz. This circuit was literally thrown together with parts laying
on the bench. I built it dead bug style on a piece of copper clad board. It should
work with little or no modification, other thano get it to oscillate, and at higher
frequencies, you might have to reduce the capacitor values a little. Just
be...(schematic / circuit added 6/07)
AM DSB Transmitter for Hams - circuit diagram of simple double side band
suppressed carrier (DSBSC) transmitter for hams. Circuit uses crystal oscillator,
crystal can be switched for multi band operation. . (added 9/04)
AM Receiver - This is a compact three transistor, regenerative receiver with fixed
feedback. It is similar in principle to the ZN414 radio IC which is now replaced by
the MK484. The design is simple and sensitivity and selectivity of the receiver are
good. (schematic added 9/02)
AM Transmitter (Andy Collinson) - The circuit is in two halfs, an audio amplifier
and an RF oscillator. The oscillator is built around Q1 and associated components. The
tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz...(design added 8/03)
AM/FM/SW Active Antenna - This circuit shows an active antenna that can be used
for AM, FM, and shortwave SW. On shortwave band this active antenna is comparable to
a20 to30 foot wire antenna. This circuit uses receivers that use untuned wire
antennas, such as inexpensive units and car radios....(added 4/02)
Micro Power AM BroADCast Transmitter - In this circuit, a 74HC14 hex Schmitt
trigger inverter is used as a square wave oscillator to drive a small signal
transistor in a Class C amplifier configuration. The oscillator frequency can be
either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor
combination. (added 4/02)
Pi Filter has Sharp Notch - Electronic Design 10/01/97 Simple filter network makes
a great low-pass filter having a sharp notch just outside passband. Can be implemented
as active filter using GIC circuit. Voted best of issue! (added 9/04)
