radio transmitter circuit
#transmitter
#RF
#wireless
#communication
#antenna
#signal
#broadcast
#electronics
#radio waves
#modulation
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The ATL-3 Loop Antenna
All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e.g. televisions and the electric meter box, or electromagnetically radiated interferences, may...
Emergency Egg Locator Beacon (EELB)
This project was inspired by a circuit that a friend, Simon Field, showcased. He built a simple transmitter circuit using a 1 MHz "can" oscillator and a serial connector. In his circuit, he utilized a computer to turn the transmitter...
Wireless two-tone electronic doorbell circuit diagram
The transmitter circuit is activated by pressing the SB button. Components D1, D2, R2, R3, and C4 form a low-frequency oscillator that controls an audio oscillator made up of D3, D4, D5, and D6, allowing them to operate alternately. The...
Video/Audio Wireless Transmitter
In this fast-paced world, there is little time for inconveniences and a greater need for portability and adaptability. The idea for an Audio/Video transmitter stems from this need. There may have been times when you’ve wanted to hook up your...
10M Dsb Qrp Transmitter With Vfo Circuit
The three schematics illustrate three building blocks for a 10-meter SSB transmitter. These blocks can also be utilized independently as circuit modules for other transmitters. The VFO board incorporates an FET transmission oscillator, with the VFO signal being mixed in...
modulation
A reason to modulate a message signal is to match the communication channel's frequency. This is necessary because the information to be sent over the channel is often at a relatively low frequency. For instance, the frequency range of music...
Remote Operated Spy Robot Circuit
A remote-operated spy robot circuit can be controlled using a wireless remote controller. It captures audio and video information from the surroundings and transmits this data to a remote station via RF signals, with a maximum range of 125 meters,...
RF circuits
A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a few...
RF oscillator uses current-feedback op amp
A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower. The configuration samples the output current, converts it to voltage across...