Ensemble II VHF RX div
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Q- Multiplying Loop Antenna
This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception.
The described circuit is intended for use with a standard 4-foot square loop antenna, optimized for medium wave...
Remote ControlCircuit Through RF Without Microcontroller
This circuit illustrates a remote control circuit diagram using RF technology without the use of a microcontroller. Features include a simple remote control circuit that operates via radio frequency.
The remote control circuit operates by transmitting signals through radio waves, enabling...
Schematics VHF FM Receiver TDA7000 88-108 MHz
The 10K resistor is necessary if the receiver is to mute (squelch) under no-signal conditions. An additional 100K resistor can be added in series with this resistor to create an adjustable squelch. This circuit is designed to drive a crystal...
Radio circuits built
This receiver is a modification of Charles Wenzel's Two Transistor Reflex Radio. Instead of a ferrite AM loopstick antenna, a magnetic loop antenna is used, and an LM386 amplifier stage has been added to drive an 8-ohm speaker. A switch...
RF Actuated Keying Monitor
Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...
wave antenna circuit
The circuit illustrated here demonstrates that, despite advancements in components and technology, it remains possible to design effective and intriguing circuits. This design utilizes two well-known transistors, the BF256C and the BF494. Along with the necessary resistors and capacitors, these...
Rf-actuated-relay
Automatic antenna switching or RF power indication can be achieved with this circuit. Relay will key with less than 150 mW drive on 2 m.
The circuit designed for automatic antenna switching or RF power indication utilizes a relay that is...
Simple Rf Test Oscillator Circuit
A simple oscillator for intermediate frequency (IF) alignment at 455 kHz can be useful in field testing or in scenarios where a standard signal generator is available. The inductor (L1) should resonate at the desired output frequency with the series...
6m wireless remote control switch circuit
This example describes a wireless remote control switch featuring reliable operation and practical characteristics, capable of remotely controlling a 6-channel device within a 6-meter range for household electricity. The wireless remote control switch circuit consists of a wireless transmitter and...