LA1070 On-Glass Antenna Amplifier AGC IC
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RF wireless allarm magnetic switch PIC16F84
This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy to reveal the opening. To transmit the signal...
Wireless Car AlarmCircuit With 2N3904 Transistor
The following circuit illustrates a Wireless Car Alarm Circuit Schematic Diagram. Features include the ability to detect sounds within a 20-meter radius, a 1/16 wavelength antenna, and the capability to transmit radio signals up to 2 kilometers. Q1 serves as...
RF Wireless Data Transfer communication Circuit diagram
RF Wireless Data Transfer communication circuit diagram. A wireless communication interface was implemented to facilitate data transfer from one point to another using RF technology.
The RF Wireless Data Transfer communication circuit utilizes radio frequency (RF) technology to establish a wireless...
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...
an active whip receiving antenna
In the pursuit of effective small antennas, an active whip antenna was constructed. This compact vertical antenna is linked to a preamplifier, which serves to convert the high impedance of the 50-ohm receiver and coaxial cable. Various designs exist for...
Adjustable-sensitivity field-strength indicator
The LED illuminates when the RF field exceeds the pre-set field strength level. Germanium diodes are recommended. Additional information: Transistors (NPN) include 2N2222, 2N3393, 2N3904, or equivalent.
The circuit described is a simple RF field strength indicator that utilizes an LED...
Sensitive RF Voltmeter Probe
Sensitive RF Voltmeter Probe Circuit. This circuit measures RF voltages beyond 200 MHz and up to about 5 V. PARTS LIST: R1 - 4.7 MΩ, R2 - 1 MΩ, R3 - 1 MΩ, R4 - 100 kΩ, R5 - 330...
Receiver-Interface Circuit For Preamps Circuit
The purpose of the receiver/interface circuit is to pass RF to the receiver through capacitor C9, while adding DC power to the feedline through resistor R2 and RF choke L7.
The receiver/interface circuit is designed to facilitate the transmission of radio...
The R2 Single Sideband Direct Conversion Receiver
The old common-base audio preamp, which has a noise figure of 5 dB, is a clear candidate for improvement in noise performance. A common-emitter configuration with shunt feedback provides an input resistance of 50 ohms, which is preferred by the...