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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:

TEA5711T FM 'Stereo' Receiver Project   -  Philips Semiconductors introduced the TEA5711T in the 90's.  The TEA5711T is a fully operational AM/FM Stereo Receiver; with a stereo encoder built within.  To amplify the small audio signal coming from the chip, I am also using the TDA7050 Mono/Stereo Audio Amplifier! __  Designed by braincambre500 @ yahoo.com

Telephone (Bug) Transmitter FM    -  Receive telephone conversations on any FM radio with this neat little device.   __  Designed by Tony van Roon  VA3AVR

Telephone FM Transmitter   -  This FM transmitter attaches in series to one of your phone lines.  When there is a signal on the line (that is, when you pick up the handset) the circuit will transmit the conversation.  In particular it will radiate from the phone line itself.  It is a passive device, there is __  Designed by Electronics DIY

The 10mW FM Transmitter Project   -  This type PCB is the same style of design used on the 7 Watt FM Transmitter.  Take a look at the digital snap shot on the 7 Watt webpage.  Notice on that picture.  all of the components that are soldered onto the copper.  both the components and copper are on the same side of the PCB.  I decided to use this style as it was very quick and easy to change out components.  during the many months of experimentation.  So, there are no holes to be drilled on the PCB, except for the four mounting holes.   __  Designed by braincambre500 @ yahoo.com

The 200mW FM Transmitter Project   -  This type PCB is the same style of design used on the 7 Watt FM Transmitter.  Take a look at the digital snap shot on the 7 Watt webpage.  Notice on that picture.  all of the components that are soldered onto the copper.  are both on the same side of the PCB.  I decided to use this style as it was very quick and easy to change out components.  during the many months of experimentation.  So, there are no holes to be drilled on the PCB, except for the four mounting holes __  Designed by braincambre500 @ yahoo.com

The Dashboard Digital Voltmeter Project   -  This project is heLPFul to anyone who drives an automobile.  I had found this project at the local libary.  In an old publication.  I made it and it worked fine.  Below are the complete text and schematic of the Dashboard Digital Voltmeter.  I re-typed the text and re-drew the schematic.  as the printing from the book was old and faded.  Sit back and read the story why this LED display might just save you from being stranded on the road! __  Designed by braincambre500 @ yahoo.com

The Inductance/Capacitance Meter Project   -  I have taken these two projects from the ARRL Handbook 2002.  It had been in the book for a few years now.  A couple of years ago I made both of the projects, and they have been performing well since.  Since the words and schematics were so small and unclear, I had decided to re-type all the text and re-do both schematics.  as to make it easier for viewing.   __  Designed by braincambre500 @ yahoo.com

The Minimitter FM Stereo Transmitter   -  Broadcast a stereo signal from your CD player or any other source.  The signal can be picked up on a standard FM receiver.___ SiliconChip

The Moorabbin regenerative AM receiver   -  amateur radio construction projects.   __  Designed by Peter Parker

The New & Improved Islander using the NTE474 Transistor   -  The Islander is a 7-Watt LPFM transmitter using the NTE474 RF transistor.  Together with a half-wave dipole positioned in a vertical stance, the signal leaving the antenna will then radiate evenly in an omni-directional fashion.  With the antenna just at 15 feet above ground level, a signal distance of 3 miles can be achieved.  At an elevation of 50 feet above ground, a signal distance of 10 miles can be achieved.   __  Designed by braincambre500 @ yahoo.com

The Open Half-Wave Dipole Antenna Project for the FM Transmitters   -  I have used this special type dipole antenna with the 200mW FM Transmitter and the 7 Watt.  It has performed very well indeed.  Construction is fairly easy and the whole assembly is light-weight.  If you any questions concerning it or should you decide to make it, give me a call and I will help in any way that I can __  Designed by braincambre500 @ yahoo.com

The Original Islander using the NTE342 Transistor   -  My design of the Islander came after one year of intense experimentation.  Formally, the last stage had 3 more variable capacitors.  but I took them out and adjusted their respective coils to a preset form.  thereby eliminating of having to adjust 5 variable capacitors.  My PCB design is a 'no hole' component mount.  The PCB does look rather worn __  Designed by braincambre500 @ yahoo.com

The Simplest FM Transmitter   -  This is the most simple and cheap FM transmitter you can ever find.  It's powered by CR2025 3V battery and current consumption is very low.  The total size of this FM transmitter is less than that of a matchbox.  The circuit has a central RF oscillator NPN transistor BF494.  A coil takes care of the output frequency.  The coil consists of 36SWG wire 2.5 turns in 5mm diameter ferrite rod.  Keep the circuit as small as possible.  By using a standard TV antenna, the range of this transmitter can go up to 1KM radius, using small 15-20cm wire, it can work up to around 50M range.  This circuit is most suitable for miniature FM transmitter for use in computer, mobile etc to send music to home theater system without wires, and in homemade wireless walky-talkies. __

The Simplest FM Transmitter Ever Made   -  This is the most simple and cheap FM transmitter you can ever find.  This circuit is really cool.  This runs at very low voltage, by a CR2025 3V battery, current consumption is also low.And the total size of this FM transmitter (including battery, excluding antenna) is less than that of a matchbox.  The circuit has a central RF oscillator NPN transistor BF494 (substitute: BF199).  A coil takes care of the output frequency.  It consists of 36SWG wire 2.5 turns only in 5mm diameter ferrite rod.  Keep the circuit as small as possible. __

The TEA5711T FM 'Stereo' Receiver Project   -  Philips Semiconductors introduced the TEA5711T in the 90's.  The TEA5711T is a fully operational AM/FM Stereo Receiver; with a stereo encoder built within.  To amplify the small audio signal coming from the chip, I am also using the TDA7050 Mono/Stereo Audio Amplifier! __  Designed by braincambre500 @ yahoo.com

The TX-300 FM Transmitter Project   -  This power meter will let you test both the output power of Q2 (VHF amp) and Q1 (oscillator).  Circuit is now on the separate board so you can fit the main circuit of the smaller PC board. 
 __

The TX-500 FM Transmitter Project   -  This power meter will let you test both the output power of Q2 (VHF amp) and Q1 (oscillator).  Circuit is now on the separate board so you can fit the main circuit of the smaller PC board. 
 __

The UnfaIR Radio Transmitter   -  It may come to pass that AM radio stations begin to disappear, switch to a music format, or, gag, switch to local programming.  The process will probably be slow and those interesting talk programs will be available for some time over the Internet.  For those caught in such a state of Limbo, the Unfair Radio Transmitter comes to the rescue.  The Unfair Radio Transmitter is a personal radio station that broadcasts an Internet audio feed throughout the house so that those AM radios scattered about remain useful.  This is a great approach for covering a typical home and lot with a good quality signal.   __   Contact Charles Wenzel of Wenzel Associates, Inc.

Three Transistor FM Radio 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

Transmitter FM 45W with valve   -  The catering better it does not become at straight line from the network 220V but via transformer 220V/220V of isolation and safety 1AWhen does not exist the R3, the force of expense is bigger, but respectively is increased also the hum 50Hz, because the simplicity of designing.  The control (Audio In) can become from a kasseto'fwno or other powerful source.  If it is microphone it will be supposed precedes amplifier so that it acquires a force of order of 8W roughly.   __  Designed by Kyriakos Kontakos

Tunable Phono Oscillator   -  A "phono oscillator" is a simple, short-range AM band transmitter that was typically used to send the signal from a phonograph to a nearby radio, eliminating the need for an amplifier and speaker.  This version uses only one transistor and can be tuned to any desired frequency near the top of the AM band.  Fidelity is surprisingly good considering the simplicity and is suitable for transmitting "Golden Age of Radio" type shows to a restored tube set.   __   Contact Charles Wenzel of Wenzel Associates, Inc.

TV Modulator   -  This circuit uses an MC1373 to form a TV video modulator __ Designed by va3iul

TV Transmitter   -  A VHF band TV transmitter using negative sound modulation and PAL video modulation.  This is suitable for countries using TV systems B and G.   __  Designed by Submitted David Kwaku Celestin

Two transistor FM transmitter & PCB layout   -  A simple 2 transistor circuit with a Coil on the PCB.   __  Designed by G.L. Chemelec

Two Transistor FM Transmitters   -  While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio,  __

TX200 High Quality 200mW FM Transmitter    -  Here is the latest and greatly improved TX200 VFO/VCO FM transmitter.  The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter.  It is a perfect circuit for transmitting your music around the house and yard (8/06)  __

TX300 300mW FM Transmitter    -  Here is the latest and greatly improved TX200 VFO/VCO FM transmitter.  The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter.  It is a perfect circuit for transmitting your music around the house and yard (8/06)  __

TX-500 FM Transmitter Project   -  The TX500 is a simple to build 500mW FM Transmitter.  It consists of three blocks; modulator / oscillator, two stage 500mW VHF amplifier and LED based power meter.  The TX500 allows to transmit audio signals to FM band at frequencies from 88 MHz to 108 MHz (8/06)  __

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