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 than the selection of the crystal, at other frequencies. At lower frequencies you might have to increase the capacitor values to get it to oscillate, and at higher frequencies, you might have to reduce the capacitor values a little...(circuit added 6/07)

40 Meter Direct Conversion Receiver:  (electronic (schematic / circuit added 11/06)

AM Broadcast Band Regenerative Receiver:  (circuit / schematic design added 6/06)

Am Loop Antennas by Bruce Carter:  (circuit added 9/04)

AM Radio PreAmplifier:  (circuit added 9/04)

AM Receiver for Aircraft Communications:  (electronic circuit added 4/05)

AM Receiver:  (schematic added 9/02)

AM Transmitter #2:  (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 the 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. L1 can be selected for the application (added 4/02)

AM2 circuit:  (circuit / schematic design added 6/06)

Amplitude Modulation of the AD9850 Direct Digital Synthesizer:  AN-423-Analog Device Application Notes  (app note added 6/06)

Am-Receiver for Aircraft Communication (118.250MHz):  (electronic circuit added 4/05)

Designing an AM Receiver For Low Power Wireless Systems Using the NEC UPC2768GR IC (7/22/96) :  Application Note California Eastern Laboratories Doc #921  (app note added 6/06)

General Purpose RF Amplifier:  (electronic circuit added 1/03)

How to Build a 300MHz AM RF Remote Control System:  (circuit / schematic design added 6/06)

KD2BD ATV AM Video Modulator:  video signal processing circuit that allows adjustment of video gain, video bias, sync and sync level (added 6/06)

Limiting Amplifier Forms AM Modulator:  12/07/95 EDN-Design Ideas / (added 4/02)  

Micro Power AM Broadcast Transmitters:  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)

Micropower AM Band radio station:  (circuit / schematic design added 6/06)

Pi Filter has Sharp Notch:  Electronic Design 10/1/97 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)

Pi Section Coupler:  (electronic circuit added 1/03)

RF Amplifier for Ferrite Bar Antennas:  (electronic circuit added 1/03)

Unamplified Four Foot Box Loop:  (electronic circuit added 1/03)

ZN414 AM Receiver:  (circuit / schematic design added 6/06)