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HAMCOM (SSTV, RTTY, FAX, PSK31...) modem using PC-speaker for TX - Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX - Ham Radio - Schematic - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
Hear AM ateurs on your FM Radio! - amateur radio construction projects. __ Designed by Peter Parker
HeNe Laser Transmitter/Receiver - This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc). The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself. LASERs are available from MWK industries. __ Designed by Aaron Cake
HF linear Amplifier with MRF454 - 100W HF Linear Amp - Schematic only, no circuit description __ Designed by © 2001 - YO5OFH, Csaba Gajdos
High Current Regulated Supply - Current of LM317 voltage is increased by using an additional power transistors.__
High dynamic range RF Amplifier - Schematic only, no circuit description __ Designed by © 2001 - YO5OFH, Csaba Gajdos
High Power FM Microphone FM Bug - My FM Wireless Microphone has been a very popular project with beginners and experienced constructors alike. it has been used inside guitars and as the basis of a remote control system. __ Designed by Harry Lythall-SM0VPO
High Power FM Wireless Microphone - This FM Wireless Microphone has been a very popular project with beginners and experienced constructors alike. it has been used inside guitars and as the basis of a remote control system. I do however, receive many requests for a higher powered circuit and better microphone sensitivity. This High Power FM Wireless Microphone has a better frequency stability, over 1 Km range and is good on microphone sensitivity. This has been achieved by adding an RF amplifier buffer (with 10dB gain) and an AF preamplifier to boost the modulation a little.__
Improved AM Micropower Transmitter - The following circuit is an improved version of the transmitter above. it features a high Q pot core autotransformer that provides a very high voltage to the antenna, greatly improving the range and an improved crystal oscillator section. (Also see phono oscillator for a tunable version.) __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Improved FM Stereo Modulator - This circuitry is used for generating a high quality FM stereo multiplex signal that is suitable for driving mono FM transmitters. The Rev E2 FM stereo multiplex generator is the most recent design in a series of circuits that have appeared on this site. This version features improvements to the audio mixer stage, better gain adjustments in the audio filter stage and a rework of the multiplexer stage. When it is adjusted properly, the Rev E2 design produces an FM stereo signal with excellent fidelity. __ Designed by Forrest Cook
Inductive Pulse Receiver (175Khz) - This circuit is discussed in more detail in the Experimenters Journal. The receiver’s six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
Infrared Remote Extender Circuit - This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Infrared Transmitter & Receiver Schematic Diagrams - Schematic only, there is no circuit description given__
Infrared Transmitter / Detector - This circuits consist of two parts, the first part will transmit a signal upon press of a button, and the second part will detect that signal and trigger a relaykinda like a simple remote control__
Interference Canceller - This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing
iPod FM Transmitter - Here are instructions for building your own ipod FM radio transmitter. it works quite easy, there is a power switch on the bottom to turn it on and tune your radio and transmitter to the right frequency. For the antenna you can use a copper wire of 70 cm. The range of this FM transmitter is about 100 to 150 meters (500 feet). With R5 you can adjust the input signal and with C6 you can tune your frequency. Transmitter is supplied by 9V battery.__
Ipod Stereo FM transmitter with 1W output power - This project explain how you can build and connect a powerful 1W amplifier to your FM transmitters __ Contact maxit91 @ hotmail.com
IR Music Transmitter & Receiver - Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver.__ Electronics Projects for You
IR transmitter, Long Range - Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design the IR transmitter for reliable operation over a longer range, say, ...__ Electronics Projects for You
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