|
|
|
Guitar FM transmitter - (electronic circuit added 05/07)
|
|
HAM Radio BFO - circuit diagram of beat frequency oscillator using
BF494 and how to listen amateur radio communication on ordinary BC
receiver..(added 01/05) |
|
HeNe Laser Transmitter/Receiver (Aaron Cake) - (circuit /
schematic design added 7/02) |
|
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. …. [from Harry Lythall's website] |
|
Infinity Transmitter Schematic and Plans - Description: Briefly,
the Infinity Transmitter is a device which activates a microphone via a
phone call. It is plugged into the phone line, and when the phone rings, it
will immediately intercept the ring and broadcast into the phone any sound
that is in the room.... |
|
|
|
Infrared Transmitter & Receiver Schematic Diagrams - (electronic circuit
added 7/03) |
|
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 relay....kinda like a simple remote control....
|
|
Infrared Transmitter Circuit - (electronic schematic / circuit added 4/02)
|
|
Infrared Transmitter for Locomotives - (circuit / schematic added 6/05)
|
|
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…(electronic
design added 03/08) |
|
IR Transmitter Circuit - (electronic circuit added 4/05) |
|
ISM Transmitter with TDA5100/ TDA5200 - .... |
|
Laser Link Communicator - audio transmission up to few hundred meters
(circuit add 04/03/02) |
|
Laser Torch-Based Voice Transmitter & Receiver - (circuit / schematic design
added 6/06) |
|
Laser transmitter/receiver (Aaron Cake) - 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.... |
|
Long Range FM Transmitter - The power output of many transmitter circuits
are very low because no power amplifier stages are incorporated. The transmitter
circuit described here has an extra RF power amplifier stage, after the oscillator
stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm
ground plane antenna or multi-element Yagi antenna, this transmitter can provide
reasonably good signal strength up to a distance of about 2 kilometres.... [Submitted
by Viswanathan Prakash 29-1-10] |
|
Loop powers Current transmitter - 10/28/99 EDN-Design Ideas EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
|
Low Frequency Phasing Exciter - As of this writing, two programs are
available for data transmission at low frequencies that use a computer sound card and
output the audio in an I/Q format. JASON has a unique FSK format with a variety
of data rates. The "DigiMode Terminal" in Spectrum Laboratory generates PSK and
MSK signals suitable for LF work. If you are new to all of this, check out the Low
Frequency Transmission Mode article on this site.... [Design by John K. Andrews
Holden, MA FN42ch [ w1tag@charter.net ] |
|
Low Power FM Transmitter - Useful to retransmit the hi-fi to another FM
receiver nearby, or as a wireless mic (electronic diagram added 6/03)
|
|
Low-cost relative humidity transmitter uses single logic IC - 8-Nov-01 Issue
of EDN The low-cost percentage-relative-humidity radio transmitter in Figure 1
operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to
5°C. It is generally difficult to collect such data from a low-temperature area with
high humidity and low illumination. The transmitter design is simple It uses a
readily available, capacitor-type percentage-relative-humidity se.... [Design Idea by
Shyam Tiwari, Sensors Technology Ltd, Gwalior, India] |
| MC145151 PLL FM Transmitter - This PLL has
been designed with an old Motorola circuit :the MC145151. The VCO is based on a "Colpitz"
oscillator equiped with a Fet Transistor.(J310) Two varicap Diodes are used in order
to reduce the global noise of the VCO. In addition,these two diodes allow the PLL to
keep the lock status through a large range of climatic conditions. An another J310 is
used in order to match the impedance between the oscillator and the fist amplifier
stage. A MSA1105 from Minicircuits increases the RF power level coming from the VCO to
+14dBm. A simple low pass filter rejects the second harmonic to -20 dB.(Worst case)
Finally, a 7 dB attenuator and a second amplifier stage (BFR96S) achieve this radio
design.… [Michel P Web site] |
|
Medium range transmitter - ….(electronic schematic added 08/08) [Site is
under construction right now] |
|
Micro Power AM BroADCast Transmitters - In this circuit, a 74HC14 hex
Schmitt trigger inverter is used as a square wave oscillator to drive a small signal
transistor in a Class C amplifier configuration. The oscillator frequency can be
either fixed by a crystal or made adjustable VFO with a capacitor/resistor
combination. (added 4/02) |
|
Micro Power FM Broadcasting Circuits - (electronic design added 02/03/04)
|
|
Micro Spy with FETs - Circuit and notes only, no circuit description given….
[Tony van Roon's circuit] |
|
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…. [written by
Tony van Roon] |
|
Micro Spy with USW - Circuit and notes only, no circuit description given….
[Tony van Roon's circuit] |
|
MicroPower FM BroADCasting Circuits - (electronic diagram added 6/03)
|
|
Minature FM Transmitter - 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,.... |
|
Miniature beeper bumper transmitter for vehicle & asset tracking -
(schematic / circuit added 05/07) |
|
Miniature FM Transmitter - (circuit / schematic design added 6/06)
|
|
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 (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, etc.... |
|
Miniature FM Transmitter #2 - Miniature FM (voice) transmitter [Tony van
Roon's circuit] |
|
Miniature FM Transmitter #3 - Sensitive transmitter [Tony van Roon's
circuit] |
|
Miniature FM Transmitter #4 - Schmatic with parts list and notes [Tony van
Roon's circuit] |
|
Miniature FM Transmitter #5 - 9 transistor transmitter…. [Paul K. Sherby] |
|
Miniature FM Transmitter #6 - upto 500 meter range [Tony van Roon] |
|
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!… [Tony van Roon] |
|
Miniature MW Transmitter - circuit diagram of simple medium wave transmitter
using BF494B. This simple transmitter have a range of 200 meters......
|
|
Miniature tracking transmitter - his little circuit can help you to find
your car in a packed parking lot; locate a child who has disappeared in a crowd; or
reunite you with a dog that has escaped the confines and safety of your yard….. [Tony
van Roon's circuit] |
|
Monaural FM Transmitter - AN-543-MonauralFMTransmitter-Analog Device
Application Notes....[App Note] |
|
Multi Channel RC using CMOS - This transmitter has no separate on/off switch
because the joysticks switch the battery terminal. The receiver has a bigger motor to
drive the wheels and a smaller motor to drive the steering which is not proportional.
There are two speeds in forward and one in reverse. You could add an extra channel to
the receiver by using the spare latch.... [Reverse engineered schematic by Stepan
Novotill] |
|
Multiband CW Transmitter - Circuit / schematic (added 02/05) |
|
|
