Micro Spy with USW - Circuit and notes only, no circuit description given. __ Designed by Tony van Roon VA3AVR
Micropower AM Band radio station - The picture to the left is a high quality radio transmitter for the A. M. broadcast band. The transmitter legally operates with "micro-power" and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is excellent. Although the schematic looks somewhat complex, the circuitry is easy to build and adjust for experimenters with a little "tweaking" experience. A simple output meter confirms proper signal level and checks antenna tuning while "on the air". Add an audio mixer, tape recorder, and perhaps a CD player and have a near-professional micro-power station. __ Contact Charles Wenzel of Wenzel Associates, Inc.
Mini FM Broadcast Transmitter - Build your own simple minI FM transmitter. This fun project will show you how to build a minI broadcasting transmitter that can transmit an audio signal up to a quarter mile to any FM receiver. It's easy to build and a good learning experience. It serves as a hands-on learning tool for students or anybody interested in electronics. Having a range of up to a quarter mile, it's great for a house security system, baby monitoring device or simply a listening gadget that you can place anywhere! __
Mini FM Radio Broadcast Transmitter - Have you ever wanted to broadcast your own radio station within your neighborhood? This small and simple 87-108MHz FM transmitter is the toy that geeks have always wanted. This tutorial includes the PCB layout and the schematics. It has a range of up to 1/4 mile or more. It's great for room monitoring, baby listening and nature research. __
Mini FM Radio Transmitter - This small FM transmitter with a range of about 50 meters designed for hoby. With lots of mini-transmitters then you have a comprehensive, action-packed radio program. Due to the power supply via the USB port of a high frequency stability is achieved. Alternatively, the receiver, a battery 5 to 12 volts to operate. __
Mini FM Transmitter - 9 Volt battery operated simple MinI FM Transmitter. FM Transmitter is very simple, compact, and has transmission signal with a range of 100-150m, good sensitivity and low current consumption. Transmitter's schematic consists of a bass amplifier for the first transistor and the proper frequency generator in the second. FM Transmitter divided transitional capacitor that allows you to set up a cascade separately. __
Mini Tracker - This beeping bug can be attached to anything from a glider to a pot-plant and you can track it with an FM radio. Why track a pot-plant? Read on to find out . . . __ Contact Collin Mitchell
Miniature FM (Voice) Transmitter - Schematic + Notes (Construction) + Parts __ Designed by Tony van Roon VA3AVR
Miniature FM Transmitter - This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or more. It is great for room monitoring, baby listening, nature research, etc. L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4 inch diameter form __ Designed by Andy Wilson
Miniature FM Transmitter #1 - 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 (Tony van Roon's 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, __ Designed by Tony van Roon VA3AVR
Miniature FM Transmitter #5 - 4 Transistor Transmitter - Circuit + Parts Lits + Notes __ Designed by Paul K. Sherby
Miniature FM Transmitter #6 - up to 500 meter range - Circuit + Parts List + Notes __ Designed by Tony van Roon VA3AVR
Miniature FM Transmitter #7 - There is no thrill like the thrill you get from operating equipment you have built yourself. If you have never built a project from a magazine before, let this be your first--you'll see how much satisfaction and fun you can have! __ Designed by Tony van Roon VA3AVR
Miniature MW Transmitter - circuit diagram of simple medium wave transmitter using BF494B. This simple transmitter have a range of 200 meters __
Modulating a Reference Allows Maximum-Value Search for Phase Detection - 04/21/11 EDN Design Ideas: Modulating a reference and target signal lets you find the maximum modulation based on modulation phase. Design by Chien-Hung Chen, Hui-Shun Huang, Jyi-Jinn Chang, and Tai-Shan Liao, National Applied Research Laboratories, Hsinchu, Taiwan
Modulation Monitor - Very simple and useful circuit used to monitor on air transmission of your low power amplitude modulated transmitter. __
Modulator Draws just 5 mA at 27V - 06/05/97 EDN-Design Ideas - Single-sideband (SSB) modulation uses the frequency spectrum and generates output power more efficiently than does full-amplitude modulation. Although not used for data transmission, SSB modulation is still popular for the transmission of voice at HF and low-end-VHF. The circuit in Figure 1 generates 35- to 80-MHz SSB signals by combining wideband, low-voltage op amps with an IC that integrates all the necessary functions. All the ICs operate at 3V±10%. - Circuit Design by Kevin Bilke, Maxim Integrated Products, Reading, UK
Modulator's Design Cuts FPGA's Gate Count - 01/06/94 EDN Design Ideas: The pulse-width modulator (PWM]macro in Fig 1 requires only half as much logic as a conventional 2-counter design. With the help of extra logic, a synchronous, loadable up/down counter can encode information in the duty cycle of a constant-frequency, constant-amplitude signal Design by Bernie New, Xilinx, San Jose, CA
More crystal sets - Response to December's column was so favourable that we return to crystal sets and allied topics this month. Keep reading to find out how to improve your AM broadcast reception, make your crystal set deliver hi-fI audio and set a fashion trend with the all-new 'wearable wireless' pedestrian mobile crystal setamateur radio construction projects. __ Designed by Peter Parker
Morse Adaptor for your VHF/UHF FM rig - Everyone knows that the best way to practice Morse is to use it on the air. But how do you send Morse if you don’t have a multimode HF or VHF transceiver?Well, you could hold a microphone up to a code practice oscillator, and hold the PTT down while pressing the key, but it’s very clumsy, and the transmitted tone is likely to be harsh. Clearly something better is needed. __ Designed by Peter Parker
Morse Code Tutor - A program (23kb) written in C++. Morse code uses dot and dash for communication. Still it is popularly used for communication is short wave bands. The Archive contains program source code and executable __
MPF102 FM Receiver - An FM regenerative receiver using a single FET and one audio amplifier IC. __ Designed by Andy Collison
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