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Modulator Circuits
Modulators:  #'s - A        B - F        G - M        N - T        U - Z

Last Updated: October 24, 2017 02:55 PM

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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Make Simple Circuit FSK Modulator   -  10/11/01 EDN Design Ideas:  The need for a compact telemetry system poses a challenge for designing a small, light, low-component-count system.  Interfacing serial data from the microprocessor is also difficult because most low-cost RF transmitters do not accept dc levels at the input.  Commercial FSK (frequency-shift-keying] modulators are bulky and need many passive components __ Circuit Design by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India

MC145170 PLL FM Transmitter   -  In order to simplify the transmitter design, we've used the new pll circuit from Motorola :the MC145170.  This PLL includes the prescaler and a serial standard bus called SPI. __

Medium Wave Active Antenna   -  This circuit is designed to amplify the input from a telescopic whip antenna.  The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz.  The tuning voltage is supplieb via RV2, a 10k potentiometer connected to the 12 Volt power supply __  Designed by David Sayles

Medium-Power FM Transmitter   -  The range of this FM transmitter is around 100 metres at 9V DC supply.The circuit comprises three stages.  The first stage is a microphone preamplifier built around BC548 transistor.  The next___ Electronics Projects for You

Micro Spy with FETs   -  Circuit and notes only, no circuit description given.   __  Designed by Tony van Roon  VA3AVR

Micro Spy with TTL   -  This circuit is old (70's) but since the 74LS13 is from the regular 74xx series and easy to obtain, I decided to keep the circuit in place until components are no longer available.  Not much to tell here.  Performance is based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'.  This circuit was experimental and so has no real purpose other than tinkering.   __  Designed by Tony van Roon  VA3AVR

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. __ Circuit 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 3VĪ10%.    - 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 __ Circuit 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 donít 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 itís 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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Modulators:  #'s - A        B - F        G - M        N - T        U - Z


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