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200mW FM transmitter – Circuit Schematic
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 ba...
Single Chip FM Transmitter – Circuit Schematic
Single Chip FM Transmitter
A simple FM transmitter links your home-entertainment system to a portable radio that can be carried around the house and into the back yard. For example, you c...
Modern FM Converter – Circuit Schematic
Modern FM Converter
Here is my design for a modern receiving converter for pre-war FM sets. Accordingly, this article presents a design for listening to present day FM stations on ...
TV Modul½±tor – Circuit Schematic
TV Modul½±tor
This circuit uses an MC1373 to form a TV video modulator. The coil and capacitor connected between pins 1 and 2 should be selected to have a parallel resonance...
2m VHF FM PMR transceiver to amateur radio converter – Circuit Schematic
2m VHF FM PMR transceiver to amateur radio converter
The PMR VHF transceiver Motorola Radius M110 (in further text referred as M110) was manufactured by Motorola GmbH therefore being an European radio. Since many ...
Micro Power FM Broadcasting – Circuit Schematic
Micro Power FM Broadcasting
Here are some utility circuits for use with the Ramsey FM10a, and other small FM stereo transmitter kits. This information may be helpful for setting up a micro...
Low power temperature controller – Circuit Schematic
Low power temperature controller
This circuit was built to stabilize a radio frequency VFO (Variable Frequency Oscillator) for ham radio applications. The circuit has also been used to lower th...
FM stereo multiplex generator – Circuit Schematic
FM stereo multiplex generator
The design philosophy for this circuit was centered on replacing all of the op-amp circuitry found in the earlier circuits with discrete transistors and LC filt...
RF Isolator – Circuit Schematic
RF Isolator
An RF isolator is a seemingly magic device that allows signals to pass in only one direction. Signals applied to the input port are sent to the test port and si...
RF Isolator – Circuit Schematic
RF Isolator
An RF isolator is a seemingly magic device that allows signals to pass in only one direction. Signals applied to the input port are sent to the test port and si...
Ham radio Communication – Circuit Schematic
Ham radio Communication
Its a very easy interface to build an requires only a few £/$ worth of components. A you can see by the picture on the right, there`s not much to it. To be hon...
portable FM transmitter – Circuit Schematic
portable FM transmitter
A portable FM transmitter that can be used to replace a FM microphone. This simple transmitter operates from a 9V battery as shown above. I personally built thi...
2 Transistor FM Voice Transmitter – Circuit Schematic
2 Transistor FM Voice Transmitter
Take care with transmitter circuits. It is illegal in most countries to operate radio transmitters without a license. Although only low power this circuit may b...
MICRO FM Bug – Circuit Schematic
MICRO FM Bug
The circuit consists of three stages, an electret microphone, an audio amplifier and an RF oscillator. The electret microphone consists of only two parts - a F...
LED Power Meter – Circuit Schematic
LED Power Meter
The LED power Meter is a simple RF detector using diodes to charge a capacitor. The voltage developed across the capacitor is indicated by a multimeter set to a...
Field Strength Meter II – Circuit Schematic
Field Strength Meter II
This project has 3 features. 1. It`s a Field Strength Meter, 2. A Frequency Meter and, 3. An aid for testing detuned transmitters. Its uses will becom...
Field Strength Meter – Circuit Schematic
Field Strength Meter
This Field Strength Meter has been specially designed for our FM bugs. It is capable of detecting very low power transmitters and will assist enormously in peak...
stable guitar FM transmitter – Circuit Schematic
stable guitar FM transmitter
This FM transmitter has a number of features, with a volume control to adjust the input level and a small, neat box to make it easier to attach to a guitar. The...
RC Receiver tester – Circuit Schematic
RC Receiver tester
No Description available....
RC 4-Channel FM receiver – Circuit Schematic
RC 4-Channel FM receiver
This small receiver with reduced range (weight 9g, dimensions 32 x 25 mm) is suitable for slow-flyer, little boats, etc....