Balanced Line Driver and Receiver:  (added 9/02)

Baseband Circuits for an RFID Receiver:  DN381 -  Design Notes (Linear Technology)  (Circuit / schematic design added 6/06)

Bipolar Regenerative Receiver:  (added 8/03)

Build your own Superheterodyne Receiver:  08/01/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

Car Radio tunes the Amateur Bands:  (added 2/05)

Circuit Detects Current Pulses:  01/06/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  The pulse detector provides a visible indication of positive and negative current pulses. The pulses amplitudes can vary from20 to150 mA. The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute.

Classic detector enables Low cost receiver:  01/06/94 EDN-Design Ideas  / (added 2/06))

CLC5526/CLC5956/CLC5902 Diversity Receiver Chipset:  National Semiconductor - Application Note   (added 2/06)

Comparing EIA-485 and EIA-422-A Line Drivers and Receivers in Multipoint Applications:  National Semiconductor - Application Note   (added 2/06)

Crystal Radio #1:  This is a generic circuit, the first true radio receiver in history. Description:  Crystal radio requires no power supply to operate because it uses energy from the signals it receives. Performance is - like one should expect - poor. Nevertheless, with a good antenna and proper ground, it shouldn't be too difficult to tune to a strong AM station.  While this circuit is very simple, many points should be observed. The variable capacitor is relatively hard to get in a store these days, so your best bet to find one could be a junked AM receiver. Connect the case to the antenna and the central rod to ground. Otherwise, you'll de-tune the circuit every time you touch the capacitor.….  (added 10/05)

Crystal Radio #2:  RF Receivers & Receiver Circuits Crystal Radio (Electronic circuit added 5/02)

Crystal Radio Circuits:  (Electronic Circuit / Schematic added 10/04)

Crystal radio with Amplifier:  An improved crystal radio with a two-stage audio amplifier. The 2N3904 (or any other general-purpose NPN) acts as a preamplifier while the LM386 boosts the signal high enough to drive low impedance Walkman headphones or perhaps even a small speaker.  (added 10/05)

Crystal Set that Requires No Antenna:  (added 2/05)

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

DRCS: CLC5526/CLC5956/CLC5902 Diversity Receiver Chipset:  National Semiconductor - Application Note   (Circuit / schematic design added 6/06)

DTMF Receiver IC Mt8870 Tester:  (Circuit / schematic design added 6/06)

Exploit Digital Advantages in an SSB Receiver:  AN-302-Analog Device Application Notes  (Circuit / schematic design added 6/06) 

External Antenna for the GPS-38 Magellan 2000 or Eagle Explorer GPS Receivers:  (Circuit / schematic design added 6/06)

Four Band Double Tuned Preselector:  (Electronic circuit added 4/05)

Four Channel Wireless Transmitter and Receiver:  (Circuit / schematic design added 6/06)

GPS Receiver (Gamin Eagle Etc) to PC Interface Cables:  (Circuit / schematic design added 6/06)

GPS Receiver Based Frequency Standard:  (Circuit / schematic design added 6/06)

Hear Amateurs on your FM Radio!:  (added 2/05)

HeNe Laser Transmitter/Receiver:  (circuit added 7/02)

High Performance FM Receiver for Audio and Digital #2:  (Circuit / schematic design added 6/06)

High Speed Low Skew RS 422 Drivers and Receivers Solve Critical System Timing Problems:  National Semiconductor Application Note 05 Oct1998 / (circuit added 7/02)

How to Build a 300MHz AM RF Remote Control System:  (Electronic circuit added 4/05)