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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:

A Field Strength Meter for the FM Transmitters   -  This fun project is a home-made 'Tunable Field Strength Meter', tunable for FM Transmitters operating in the FM Broadcast Band.  Below is the detailed plans on how to make this project a success! The layout of the circuitry is small enough for the finished unit to be placed directly on top of your DVM, in order to keep output leads of the FSM as short as possible.  I had made mine on a 2 inch by 2 inch piece of PCB.  which is MORE then enough room to place the entire circuitry on.   __  Designed by braincambre500 @ yahoo.com

A Homemade Variable Tuning Capacitor   -  A 'Multi-Turn' Homemade Variable Tuning Capacitor A remarkably simple Homebrew device for tuning in your FM stations! __  Designed by braincambre500 @ yahoo.com

A Simple Circuit & Sensitive Shortwave Receiver   -  Radio Shack offers a series of pamphlets ranging from Communications to Digital Electronics.  I have collected all 9 pamphlets.  If you are ever in the store, do take a look at all the wonderful projects these pamphlets have to offer! The projects are very diversified, useful and simple to make.   __  Designed by braincambre500 @ yahoo.com

A Simple Circuit FM Stereo Transmitter   -  (ATTINY12, ATTINY25, ATtiny2313, AT90S2313, AT90S232, or nearly any other CMOS microntroller-Yes probably even a PIC!) This project appeared in the December, 2007 issue ofInfo Elektronika Magazine __  Designed by © Richard Cappels

A small FM transmitter (SMD)   -  This SMD FM transmitter has an operating frequency of about 80 to 115MHz.  Under reasonable circumstances you will be able to receive its signal at a distance of about 200 meters.  Although it is low-power, it might be illegal in your part of the planet.   __

A Superregen Receiver for FM broadcast or Aircraft band AM reception   -  This is the receiver I was bragging about on the Radio index page -- the receiver that is so sensitive it can hear the local oscillator inside a small transistor radio 30 - 50 feet away.  Build one of these little gems and you will be able to hear aircraft pilots many miles away with nothing more than a 24" whip antenna. __  Designed by Rick Andersen

A Switchable RF Probe/Watt Meter for the FM Transmitters   -  This unique project is one of the most trusted homemade test instruments to have, once you get your FM transmitter up and running ! ! !This simple little device is capable of finding your FM transmitters' __  Designed by braincambre500 @ yahoo.com

A Variable Power Supply for the FM Transmitters   -  This is a fairly simple, yet very versatile workbench power supply.  With a current limit of 1.5 amperes and a variable voltage from 2.7 volts to 16.5 volts on the output of the LM317T, this unit will come in very handy for your diversified electronic projects   (which usually include different DC voltages.  I have used it mainly for supplying my FM transmitters with different voltages, to see the different effects it has on the units.  In fact, I use it for all my FM transmitters.  It has served me well.  and is still serving proudly! __  Designed by braincambre500 @ yahoo.com

Add a signal-strength display to an FM receiver IC   -  09/05/02  EDN-Design Ideas - The Philips   (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito - Circuit Design  by  José Miguel-López, RF Center Ltd, Barcelona, Spain

Add on AM Modulator has High-Bandwidth   -  09/11/98 EDN-Design Ideas -   (File has many circuits, scoll to find this one)  The simple circuit in Figure 1  is an add-on modulator that converts the output of a continuous-wave  (CW] source to either an amplitude-modulation  (AM] or a suppressed-carrier-modulation  (SCM] format.  Because the circuit has unity gain and 50 Ohm input and output impedances, the CW generator's - Circuit Design  by  MJ Salvati, Flushing Communications, Flushing, NY

Aircraft Radio Communications Receiver   -  The communications between commercial aircraft and the ground can be interesting, amusing and sometimes even disturbing.  However radios that receive the approximately 220MHz to 400MHz band commonly used for aircraft   (both military and commercial) are not easily found.  And scanners can be complicated, large and expensive.  With an easy to build circuit such as this one, everyone can enjoy listening in on these conversations. __  Designed by Aaron Cake

Aircraft Receiver   -  The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions.  The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be fine inside the cabin of the aircraft.  Nevertheless, check the regulations before using this receiver on a commercial airliner __   Contact Charles Wenzel of Wenzel Associates, Inc.

Altoids Tin LowFER Transmitter   -  Here's a complete LF Beacon transmitter for LowFER   (Low-Frequency Experimental Radio).  The transmitter is designed for license-free operation between 160 kHz and 190 kHz, consuming the legal limit of 1 watt power input to the final RF output stage.  For fun, the complete transmitter is built into an Altoids mint tin.  The circuit is built dead-bug style on a piece of copper clad circuit borad material, lightly painted with Testors transparent Hot Rod Red to prevent tarnish.  The paint doesn't seem to make soldering any more difficult.  The board is grounded to the tin in a few places.   __   Contact Charles Wenzel of Wenzel Associates, Inc.

ALTOIDS Tin Part 15 Version FM Transmitter   -  The transmitter uses 2 MPSH10   (equiv BF494 or NTE229) transistors in a double-ended free-running voltage controlled oscillator   (VCO) operating at half the output frequency on each side and combined at L2, which is tuned to the 2nd harmonic of the VCO and covers the 88-108 MHz range.  A standard 9 volt battery is used for power and fits inside the tin.  The mono audio input circuit is totally passive with 70us pre-emphasis provided and the audio quality is great. __

AM Broadcast Band Portable Loop Antenna   -  Lamenting the passing of local AM radio? Desert island or outback mining camp based? Unable to clamber up on the roof for a long wire aerial anymore? Here's a simple medium wave tunable loop that, even indoors, will bring signals out of thin air!___ SiliconChip

AM Broadcast Band Regenerative Receiver just two transistors!   -  amateur radio construction projects.  circuit only, no description given.   __  Designed by Peter Parker

AM DSB Transmitter for Hams   -  circuit diagram of simple double side band suppressed carrier   (DSBSC) transmitter for hams.  Circuit uses crystal oscillator, crystal can be switched for multI band operation __

AM Farm Radio Power Supply   -  Prior to the 1950s, many rural areas in the US had no electricity.  Many companies sold battery operated vacuum tube radios for use in these areas, the radios are commonly called Farm Radios.  Farm radios are often available at very reasonable prices and can make a good restoration project __  Designed by G. Forrest Cook

AM Loop Antenna & Amplifier   -  PICAXE VSM: The PICAXE Circuit Simulator!___ SiliconChip

AM Modulator   -  This circuit uses two signal generators to simulate an Amplitude Modulated RF carrier wave.  The output can be used to simulate the response of LC and tank circuits.   __  Designed by Andy Collison

AM Modulator has high bandwidth   -  09/11/98 EDN-Design Ideas -   (File has many circuits, scoll to find this one)  The simple circuit in Figure 1  is an add-on modulator that converts the output of a continuous-wave  (CW] source to either an amplitude-modulation  (AM] or a suppressed-carrier-modulation  (SCM] format.  Because the circuit has unity gain and 50 Ohm input and output impedances, the CW generator's - Circuit Design  by  MJ Salvati, Flushing Communications, Flushing, NY

AM Radio Transmitter using 555 Chip   -  This project shows how to build a simple AM radio transmitter based on 555 timer IC.  The circuit parts are: the 555 timer IC, a NPN transistor three caps, three resistors and a potentiometer.  The circuit is able to generate an amplitude modulation signal at 600Khz and you are able to receive it using a plain AM receiver.  The range is about 30-40 feet. __

AM Receiver   -  This is a compact three transistor, regenerative receiver with fixed feedback.  It is similar in principle to the ZN414 radio IC which is now replaced by the MK484.  The design is simple and sensitivity and selectivity of the receiver are good.   __  Designed by Andy Collison

AM Receiver for Aircraft Communications   -  This receiver is controlled by a Frequency Synthesizer Circuit.    The receiver is VERY stable, low noise-level and easy to build and tune __  Contact maxit91 @ hotmail.com

AM Receiver with Quadrature Mixer   -  This circuit is for a superheterodyne receiver where the image frequency is suppressed without the use of an input filter.  Instead, it uses two NE   (SA) 612 type mixer ICs that each work 90.  must register on this site __  Designed by Published in Elecktor July/Augu, 2010

AM to FM converter   -  The above circuit can be used to hear AM Stat;ion on your FM Radio.   It is a regenerative circuit that samples Amsingnals of all frequendy and retransmits them in the FM band   (88-108) and even in the TV Band. __  Designed by aswinkumar

AM Transmitter   -  The circuit is in two halfs, an audio amplifier and an RF oscillator.  The oscillator is built around Q1 and associated components.  The tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz.   __  Designed by Andy Collison

AM/FM Radio Frequency Amplifier for receivers   -  This 'AM-FM Radio Frequency Amplifier' is built with only a few components; which makes the project simple and direct.  There are no electrolytic capacitors and the three capacitors used can be ceramic or mylar.  You can employ 1/4 watt resistors or even 1/2 watt resistors which are easier to manage.   __  Designed by braincambre500 @ yahoo.com

AM2   -  This is the schematic only __  Designed by quadworld @ reocities.com

Am-Receiver for Aircraft Communication 118.250MHz   -  This receiver is controlled by a Frequency Synthesizer Circuit.    The receiver is VERY stable, low noise-level and easy to build and tune __  Contact maxit91 @ hotmail.com

Another Simple Circuit FM Transmitter   -  Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter.  The range of the transmitter when running at 9V is about 300 feet.  Running it from 12V increases the range to about 400 feet.  This
transmitter should not be used as a room or telephone bug.   __  Designed by Kamran Ahmed-UK

Asynchronous Divides Frequency by 1.5   -  10/10/96 EDN-Design Ideas - In some designes, you need to provide a number of phase-related clocks to various components.  In most cases, you generate the needed clocks by dividing a master clock by a power of two   (synchronous division).  However, sometimes, it is desireable to divide a frequency by an odd or even fractional divisor.  In these cases, no synchronous method exists without generating a higher frequency master clock.  Figure 1 shows the block diagram of an asynchronous clock divider that provIdeas division by a factor of 1.5. - Circuit Design  by  Rolf Fielder, Ferrari Electronic GmbH, Teltow, Germany

Automicro RX3302 receiver Module photo   -  Schematic Only __  Designed by Peter Jakab, Electrical Engineer, Engineer of Informatics

Aviation Band Receiver   -  Figure 1 shows a schematic diagram of the Aviation Receiver--a super heterodyne AM   (Amplitude Modulated) unit built around four IC's: an NE602 double balanced mixer   (U1) , an MC1350 linear IF amplifier   (U2) , an LM324 quad op-amp   (U3) , and an LM386 audio amplifier   (U4).  In operation, an antenna that plugs into J1 picks up the AM signal.  That signal is then coupled through C1 to a three-section, tuned-filter network consisting of L1-L5 and C2-C6 __  Designed by Tony van Roon  VA3AVR

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

 


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