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Sensitive Modulated Light Receiver uses a Single IC - The circuit uses a very inexpensive C-MOS IC that is connected to a small photodiode. Using a unique inductive feedback network, the circuit provides high sensitivity under high ambient light conditions. it is a great circuit when you want to extend the range of an optical remote control transmitter . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Sentinel 315W - The third type of AM/FM mantel radio I'veacquired with a Fremodyne circuitThis one had seen a rather careless attempt at restoration __ Contact blehack @ yahoo dot com
Serial Receiver-32 Bit - This is the schematic for an FM transmitter (57.6 K Baud TTL & CMOS
) with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL can be used on this circuit. __ Designed by Bill Bowden
Several Receivers - Schematic only, no circuit description __ Designed by Web David White, WN5Y
Short Wave Regenerative Receiver - Sensitivity and selectivity are the major concerns of a short wave enthusiast when he looks up for a receiver. Commercial communications models with superhet circuitry surely satisfy his requirements, but these are expensive. He would rather go for a Homebrewed radio, being a regenerative receiver an affordable choice __ Designed by Ramón Vargas Patrón
Shortwave Audion - it is a Hartley-ECO Audion, in which the plate is grounded for RF. Positive feedback from cathode to grid occurs via the coil tap. The amount of feedback is determined by the 100k pot; this controls the voltage at the screen grid and thereby the transconductance of the valve (higher voltage resulting in greater transconductance). __
Shortwave Bug - Circuit and notes only, no circuit description given. __ Designed by Tony van Roon VA3AVR
Shortwave received - Schematic only __ Designed by Petr Prause, OK1DPX
Shorty Forty Antenna - Do you have space limitaion to put a 40 meter dipole. Try this Compact 40 meter antenna. __
Simple FM Receiver - ContentsWhat is a FM receiver? FM receiver components list FM receiver circuitry More projectsWhat is a FM receiver? A radio receiver is an electronic device that receives radio waves and converts the...__ Electronics Projects for You
Simple RF Based Code Lock - This simple radio frequency (RF) based code lock incorporates a pair of 433MHz ready made RF transmitter and receiver modules. it is a remote-controlled and code-protected locking system. The code is...__ Electronics Projects for You
Simple Aircraft Receiver - Easy to build, 2 chip Superhetrodyne for the aircraft band. (Featured in EDN) __ Designed by Steve Hagerman
Simple AM Radio Receiver - This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang, intended for small AM radios. The aerial tuned circuit feeds diode D1 which functions as the detector. A germanium type is far preferable to a silicon__
Simple Circuit 10GHz RS232 high speed link using FM - The poor man's high speed microwave link. Still working on this. it uses a XC9536 CPLD to link to a serial line, this chip has a built in UART, differential encoder/decoder and a manchester encoder and decoder. it just fits in a simple 36 block device but I am still battleing with the FM decoder which is to be as simple as possible. Favoured project is the DVB IP Gateway so this one has moved to the rear end of my priority list. (Sorry) __ Designed by Edward John Cardew
Simple Circuit 75M SSB rig with PTT - Setting this control can be a little trickier too. Too much gain and the signal will distort, while too little will result in low power output. The power you see on an average reading watt meter when using normal speech should be about 1/3d that which is seen when you whistle loudly into the mic. The best way to set the gain is to look at the output with a Scope and make sure it looks like the pictures you see in the Handbook. __ Designed by Steven "Melt Solder" Weber KD1JV
Simple Circuit ADS-B aircraft transponder Decoder based on a PIC18F2550 microcontroller - This project aims at creating a hobbyist ADS-B receiver with on the shelves components. it uses a PIC 18F2550 to decode ADS-B pulses received by a modified SAT tuner and demodulated by an Analog Device AD8307 log amplifier.__
Simple Circuit Class a Amplifier-10W audio output - This page describes an antenna, a 1 watt final output stage, and a transformation network for radio experiments at 187 kHz __ Designed by J. L. Linsley Hood, M.I.E.E.
Simple Circuit Crystal Radio - The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals. A "cat's whisker" wire contact was moved about the surface of the crystal until a diode junction was formed. The 1N34A germanium diode. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Simple Circuit CW identifier for a FM repeater (PDF) - Not in English __ Designed by Aleksander Stare
Simple Circuit Detects Current Pulse - 01/06/94 EDN Design Ideas: The pulse detector provide as 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 Design by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada
Simple Circuit FM Exciter - I have had requests to add a VHF FM transmitter, to the QRP collection. This project is a simple transmitter using only one crystal and will cover 145.00 to 146.00 MHz. The crystal is a 44.9333 MHz crystal for 145.500 receive, as used in the Trio (Kenwood) 2200, PYE, Motorolla, Tait equipment, to name but four. The frequency of the crystal is not critical as almost any other xtal for the 2-meter band will function __ Designed by Harry Lythall-SM0VPO
Simple Circuit FM Receiver - With the TDA 7000 you can build an FM radio with a minimum of components; most of them so easy to managelike the ceramic capacitors that do not require polarizationand only two resistors. The components you will employ will be of small dimensions and low cost. Even the integrated circuit itself, the TDA 7000, is not of great cost. __
Simple Circuit FM receiver based on a TEA5591 IC - Communication in F.M. band is easy, less expensive and has many more advantage. As we have already published Simple F.M. transmitter circuit in previous article. Now, here is a circuit diagram with description of Powerful F.M. receiver using single IC used to receive frequency range of 88 MHz to 108 MHz in F.M. band__
Simple Circuit home made ADS-B receiver that takes IF from a Modified receiver - The new project uses old analog satellite receiver tuners that have to be modified so that the AFC is disabled and the AGC usually set to maximum gain. The output is the 480MHz iF signal. __ Designed by Edward John Cardew
Simple Circuit Repeater Fan Controller - an 18 kB PDF file __ Designed by Robert Shepard KA9FLX
Simple Circuit RF Power Meter - Here is a simple set up which will enable them to measure the out put power of their transmitter. All that they require is a good multimeter which has a sensitivety of 20k ohms/4 Watts which is adequate for low power transmitters. __
Simple Circuit RF signal meter with LEDs - The simple but effective circuit presented here converts an RF input signal into a visible LED indication. Only discrete components are used. The circuit can be used as field strength analyser or RF Wattmeter when a 50 ohms resistor is connected between ground and HF (J1). Calibration required. Of course you can add extra LED stages in case you want to extend the range. The second picture shows how the circuit can be build on a very small piece of vero-board. __ Designed by Ron Zoetermeer, JO22gb, Netherlands
Simple Circuit RIT based on a 2N7000 FET - The diagram below shows the simple RiT circuit that I added to my 15M Cub. The circuit is certainly not original, but I don't recall where I first saw it. A 1N4004 is used as a "tuning diode" – reverse voltage applied to it via the 2K pot varies it capacitance. (Do not use a 1N4001, …2 or …3 – they won't have sufficient capacitance range.) __ Designed by Larry East, W1HUE
Simple Circuit Time-Difference-Of-Arrival RDF - This T. D. O. A. RDF set is built into a die-cast Pomona box. I built it in October, 1989. As you can see from the photo, it has held up to lots of abuse as it gets knocked around in my RDF bag. __ Designed by Joe Leggio WB2HOL
Simple Circuit Time-Difference-Of-Arrival RDF UNIT - This T. D. O. A. RDF set is built into a die-cast Pomona box. I built it in October, 1989. As you can see from the photo, it has held up to lots of abuse as it gets knocked around in my RDF bag. __ Contact Joe Leggio WB2HOL
Simple Circuit Two-transistor Radio - Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive. Strong stations will provide plenty of volume __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Simple Circuit Wireless Microphone - This wireless FM microphone is simple to build and it has a useful transmitting range (over 300 meters in the open air). Despite its small component count and a 3V operating voltage it will easily penetrate over three floors of an apartment building. it may be tuned anywhere in the FM band (87-108MHz) and its transmissions can be picked up on any standard FM receiver.__ hobbyteam @ hobby-hour.com
Simple Circuit WWV receiver for 10 MHz calibration signal - Simple Direct Conversion receiver to use with a PC to calibrate a 10 MHz VCXO - "Zero beating" to the WWV carrier for calibration of oscillators is easier said then done. To truely "zero beat", you must do exactly that, produce a 0 Hz beat note. This is difficult to do, since most receivers do not have an audio responce down to zero Hz! The next best thing to do is to misstune the receive by say 1000 Hz and match your oscillator to that tone. However, you must be very careful with the signal levels from your oscillator into the receiver as to not overload it and to be able to hear both your oscillator and WWV at the same time. __ Designed by Steven "Melt Solder" Weber KD1JV
Simple FM Stereo Tuner - This is one of my favorite radio builds just because of how simple it is and how well it is able to pick up a lot of FM radio stations. I have browsed the world in search of a one transistor FM receiver. I have seen a couple but they were always attached to some sort of added device, such as another IC or another transistor for amplification in the receiver itself.__
Simple, low cost AM SWBC Receiver - Short Wave AM Broadcast Receiver. Simple, inexpensive and effective. __ Designed by Steven "Melt Solder" Weber KD1JV
Simpler Single-Signal Direct Conversion Receivers - i love the sonic impact of a well-designed direct conversion receiver. My best, a version of Rick Campbell’s R1 receiver with a Level 17 diode ring mixer still thrills me to bits. How do I describe the sound of a well-designed DC receiver? Well, subjectively of course: pure, raw, sibilant and dynamic come to mind. For contrast, after listening to 1 of my DC receivers, i’ll fire up 1 of those quotidian home brew superheterodyne receivers [NE612 — Cohn crystal filter — LM386 etc.] To my ears at least, the latter sounds cadaverous __ Contact Vasily Ivanenko |
