40meter cw transceiver
No description available.
TRF Radios
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old Russian radio (2x280pF). It has been noted that in areas with strong signals, optimal performance...
DF data transmission module and the super-regenerative receiver module
The DF data transmission module operates at a frequency of 315 MHz and utilizes a surface acoustic wave (SAW) resonator for frequency stabilization, ensuring high frequency stability. The frequency drift remains minimal, at only 3 x 10^-6, across a temperature...
5W-150mhz-amplifier
This circuit employs the MRF123 TMOS power FET. The MRF134 is a high-gain FET that may exhibit instability at both VHF and UHF frequencies. A 68-ohm input loading resistor has been used to improve stability. This amplifier achieves a gain...
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...
Metal detector circuit diagram 6
The metal detector circuit consists of several key components including the probe oscillator, reference oscillator, oscillation signal processor, mixing amplifier, and ammeter PA. The probe oscillator is made up of the oscillating tube VI, exploration coil L1, capacitors C1 to...
Antennas
The antenna used for receiving or transmitting is a crucial component in a communication link. Its performance significantly influences the effectiveness of both the receiver and transmitter. Antennas are reciprocal, meaning an antenna designed for transmission can also function for...
Electronic Drum Synthesizer
The circuit consists of two twin-T oscillators set below the oscillation threshold. To initiate oscillation, a touch on the Touch Pad is required. The schematic diagram illustrates the circuit, where different touch patterns on the pads can create a variety...
High-current-oscillator
The oscillator output of the XR-567 can be amplified using the output amplifier and high-current logic output available at pin 8. In this manner, the circuit can switch 100-mA load currents without sacrificing oscillator stability. The oscillator frequency can be...
QRP CW TRANSCEIVER
This is a 3-W, single-circuit board, VFO-controlled CW transceiver for 40 or 30 meters, featuring a direct-conversion receiver with audio filtering, Receiver Incremental Tuning (RIT), and speaker level audio volume. The transmit frequency is generated by Q1 and its associated...