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UHF Antenna Booster – Circuit Schematic
UHF Antenna Booster
UHF antenna booster can be used for better reception, especially when you`re far from TV station / relay transmitter. This UHF antenna booster works in 400-850....
Tv modulator – Circuit Schematic
Tv modulator
The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacito...
TDA7000 FM Radio Receiver Circuit – Circuit Schematic
TDA7000 FM Radio Receiver Circuit
GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum on peripheral components is importan...
TDA7000 FM Radio IC Test Circuit and Datasheet – Circuit Schematic
TDA7000 FM Radio IC Test Circuit and Datasheet
TDA7000 is an IC for FM portable radios which has a Frequency-Locked-Loop system with an intermediate frequency of 70kHz. The TDA7000 has the following function...
Superlinear FM (Frequency Modulator) – Circuit Schematic
Superlinear FM (Frequency Modulator)
Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is....
Stereo FM transmitter using BA1404 – Circuit Schematic
Stereo FM transmitter using BA1404
A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo mod...
Small TV transmitter circuit – Circuit Schematic
Small TV transmitter circuit
This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo....
Simplest RF Transmitter circuit diagram – Circuit Schematic
Simplest RF Transmitter circuit diagram
This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is ...
Simple RF Detector for 2 m – Circuit Schematic
Simple RF Detector for 2 m
This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th....
Simple FM Transmitter Circuit – Circuit Schematic
Simple FM Transmitter Circuit
Simple FM Transmitter Circuit This simple FM transmitter circuit was built using a transistor with a transmission distance of about 300m around your home. It`s....
Sensitive FM Transmitter Bug – Circuit Schematic
Sensitive FM Transmitter Bug
This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency ...
Radio receiver using the ZN414 – Circuit Schematic
Radio receiver using the ZN414
This is a project from the dim and distant past that has proven to be a real winner. I have used it as a basis for an 8 channel proportional R / C (AM) and 145M...
Radio Modem Circuit – Circuit Schematic
Radio Modem Circuit
This radio modem is popular for amateur radio packet application. This radio modem is powered by the data and control lines, so it need no additional power....
RF field strength meter circuit – Circuit Schematic
RF field strength meter circuit
A sensitive and reliable rf field strength meter is an invaluable instrument in amateur radio and in radio controlled model area. A field strength meter is....
RF Fm 88-108 MHz radio amplifier BLF 245 – Circuit Schematic
RF Fm 88-108 MHz radio amplifier BLF 245
This fm 88-108 Mhz radio amplifier is equiped with BLF 245 and can be user with a heatsink from a processor and cooler. The BLF 245 Datasheet can be dow....
RF AGC with Digital Control – Circuit Schematic
RF AGC with Digital Control
The AGC is used in many system especially communications. This AGC? works at 50Mhz, and the output voltage is set by a digital signal that is needed by....
Quality FM transmitter circuit – Circuit Schematic
Quality FM transmitter circuit
This house FM transmitter for your stereo or any other amplifier provides a good signal strength up to a distance of 500 meters with a power output of abou....
PLL Lock Detection – Circuit Schematic
PLL Lock Detection
In some PLL application, sometimes we need to provide lock indication when the PLL is in locked state. The simplest one is binary indication, 0 or 1 to....
One Transistor FM Receiver circuit diagram – Circuit Schematic
One Transistor FM Receiver circuit diagram
This is a very simple FM receiver which build based on one transistor only. No chip or another active component. The output is connected to earphones, you need ...
Simple AM Transmitter – Circuit Schematic
Simple AM Transmitter
There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind ...