|
|
[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
|
|
Balanced Line Driver & Receiver - Use these to eliminate hum for long signal leads
(electronic design added 9/02) |
|
Baseband Circuits for an RFID Receiver - DN381 Design Notes (Linear
Technology) (app note added 6/06) |
|
Bipolar Regenerative Receiver - Contrary to what some radio experimenters think, a
bipolar regenerative design can be made to work efficiently. The major concern is the
low input impedance of the detector-amplifier bipolar….(electronic design added 08/03) |
|
Build your own Superheterodyne Receiver - 08/01/96 EDN-Design Ideas / (added 3/03)
|
|
Car Radio tunes the Amateur Bands - (electronic schematic / circuit added 2/05) |
|
CB receiver - Tendency of catering: + 12V DC; Frequency of reception at AM:
~27MHz ….(circuit design added 08/08) |
|
Circuit Detects Current Pulses - 01/06/94 EDN-Design Ideas / (added 3/03)
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 (app note added 2/06) |
|
Comparing EIA-485 and EIA-422-A Line Drivers and Receivers in Multipoint Applications
- National Semiconductor Application Note (app note added 2/06) |
|
Crystal Radio - 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, .…. (added 10/05) |
|
Crystal Radio (Aaron Cake) - RF Receivers & Receiver Circuits Crystal Radio (added
5/02) |
|
Crystal Radio RF Amplifier - One of the best places to add a transistor to a
simple crystal radio is at the front end in the form of an RF amplifier. The circuit
below is a simple but effective amplifier which will give surprising performance
improvement. This amplifier (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 - (electronic schematic / circuit added 2/05) |
|
Designing an AM Receiver For Low Power Wireless Systems Using the NEC UPC2768GR IC
7/22/99 - Application Note California Eastern Laboratories Doc #921 (app
note added 6/06) |
|
DIY remote control based on PIC - Control up to 8 devices by this easy
constructable remote control. It can work as a radio or infrared remote control,
depending on the components. Each device output can be configured to be momentary
(turned on while you press the button) or latched. Latched outputs can be toggled
on/off by one button per channel, or turned on and off by two buttons per
channel….(electronic schematic / circuit added 4/02) |
|
DRCS: CLC5526/CLC5956/CLC5902 Diversity Receiver Chipset - National Semiconductor
Application Note (app note added 6/06) |
|
DTMF RECEIVER - Today, most telephone equipment use a DTMF receiver IC. One common
DTMF receiver IC is the Motorola MT8870 that is widely used in electronic
communications circuits. The MT8870 is an 18-pin IC. It is used in telephones and a
variety of other applications. When a proper output is not obtained in projects using
this IC, engineers or technicians need to test this IC separately. A quick testing of
this IC could save a lot of time in research labs and manufacturing industries of
communication instruments. Here’s a small and handy tester circuit for the DTMF IC.
….(design added 11/08) |
|
Dual-Mode Whistler Receiver - This portable receiver may be completely powered by
a recorder or other device designed to use button microphones or it can use its
internal battery to provide headphone listening. I decided to see if I could increase
the values on the notch filter like that used in the computer-powered receiver above
by nearly a factor of 10. Since this receiver will be able to ... (electronic
design added (6/07) |
|
Experimental fiber optic receiver - (schematic / circuit added 6/07) |
|
Experiments with Detector Diodes - When building crystal radios or other simple
receivers, the experimenter often wonders about the relative performance of the
different diodes in the junk box. Here are the results of several experiments using
the typical ….(added 04/05/06) |
|
Exploit Digital Advantages in an SSB Receiver - AN-302-Analog Device Application
Notes (app note added 6/06) |
|
External Antenna for the GPS-38 Magellan 2000 or Eagle Explorer GPS Receivers -
(circuit / schematic design added 6/06) |
|
Feedback FM Receiver - …(electroninc design added 04/05/06) |
|
FM / AM Regenerative Receiver - Two transistor receiver. (circuit added
08/07/06) |
|
FM Band Monaural Transmitter - (circuit design added 8/03) |
|
FM Band PreAmplifier - (circuit / schematic design added 6/06) |
|
FM Booster - (electronic Circuit / Schematic added 10/04) |
|
FM Bug 1.859.telia - (electronic circuit added 4/05) |
|
FM Microphone (1) - A micro-transmitter is so small and sensitive, it have only 8
easy-to-get parts and can be assembled in one hour. (6/3/2006) |
|
FM Microphone (2) - (electronic circuit added 7/03) |
|
FM Oscillator - ASCII format (circuit design added 10/06) |
|
FM Portable - …(schematic added 04/05/06) |
|
FM radio (may be used with PC) Circuit - ….(design added 08/08) |
|
FM Radio Microphone with Internal Loop Antenna (Area 50) - This article began as a
design guide for hyper cranial erogenic field generators, however, your primitive
earth brains are completely unable to respond to erogenic fields in the 100MHz region.
I personally had a brain upgrade (for purely medical purposes of course) so I am able
to respond....(schematic / circuit added 4/08) |
|
FM Radio Receiver - Frequency adjustment is accomplished with BB105 varicap diode
(circuit added 08/07/06) |
|
FM Radio Transmitter (David Sayles) - This small transmitter uses a Hartley type
oscillator. Normally the capacitor in the tank circuit would connect at the base of
the transistor, but at VHF the base emitter capacitance of the transistor acts as a
short circuit, so in effect, it still is. The coil is four turns of 18swg wire wound
around a quarter inch former. The aerial tap is about one and a half turns from the
supply end. Audio sensitivity is very good when used with an ECM type microphone
insert. (added 11/05) |
|
FM Radio Transmitters with Opamp - Designed by Kamran Ahmed ….(circuit / schematic
added 5/03) |
|
FM Receiver using MPF105 - (electronic design added 6/07) |
|
FM Receivers - Here is how you make a superregenerative circuit. Choose a
regenerative amplifier circuit configuration that requires more current during
oscillations than when not oscillating. Adjust the regenerative amplifier to
oscillate. Add a small circuit that uses the current of the amplifier to charge a
capacitor while oscillations are taking place. Once the capacitor is charged, the
voltage on .... |
|
FM Remote Speaker System - National Semiconductor Application Note
(app note added 2/06) |
|
FM RF Remote Control 88-108 MHz - 1KM Range (added 6/06) |
|
FM Stereo Modulator - (electronic circuit added 10/05) |
|
FM Stereo Receiver - Based on TEA5711T and TDA7050 Integrated Circuits (by Patrick
& Pedro) (circuit added 08/07/06) |
|
FM Telephone Bug (Tony van Roon) - (electronic design added 6/07) |
|
FM Transmitter - A simple 2 transistor circuit with a Coil on the
PCB....(electronic schematic added 12/08) |
|
FM Transmitter (2bjttx) - (circuit / schematic design added 6/06) |
|
FM Transmitter (fmtx_dc) - This simple transmitter operates from a 9V battery as
shown above. I personally built this for a purpose. This is how it happened:"members
of my singing group find it difficult to handle a FM mic in Church. The choir sings in
acapella form and the congregation expect us to perform well. The old FM mic system
was not a perfect solution,....added 6/06) |
|
FM Transmitter (techlib) - Here is a new slant on the ubiquitous FM transmitter
circuit. It's an FM sender. It takes a line-level stereo signal, and puts out a mono
FM signal which can be received in another part of the house. It uses base modulation,
which has always worked well in the author's experience, though spread in
base-collector varicap behaviour may conspire to cause …(electronic design add 6/07) |
|
FM Transmitter Bug - This small transmitter uses a hartley type oscillator.
Normally the capacitor in the tank circuit would connect at the base of the
transistor, but at VHF the base emitter capacitance of the transistor acts as a short
circuit, so in effect, it still is. The coil ....designed by David Sayles (electronic
design added 6/07) |
|
FM Voice Transmitter - This miniature transmitter is easy to construct and it's
transmissions can be picked up on any standard FM radio. It has a range of up to
1/4-mile (400 meters) or more, depending on the line-of-sight, obstructions by large
buildings,etc. It is great for room monitoring, baby listening, nature
research,....(electronic design added 6/07) |
|
FM Wireless Mike - low power frequency modulated transmitter using two
transistors. The circuit works with 9v power supply. . (added 9/04) |
|
FM 88MHz...108MHz amplifier - (electronic circuit added 6/07) |
|
FM3 Mods - (electronic circuit added 7/03) |
|
Four Band Double Tuned Preselector - (electronic circuit added 4/05) |
|
GPS Receiver Based Frequency Standard - (circuit / schematic design added 6/06) |
|
GPS Receiver Gamin Eagle Etc to PC Interface Cables - (circuit / schematic design
added 6/06) |
|
Hear Amateurs on your FM Radio! - (electronic schematic / circuit added 2/05) |
|
HeNe Laser Transmitter/Receiver (Aaron Cake) - (circuit added 8/03) |
|
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 / (app note added 7/02) |
|
How to Build a 300MHz AM RF Remote Control System - (electronic circuit added
4/05) |
