valve vhf fm pulse counting receiver circuit

MC28332 Single Chip VHF Narrowband FM Transmitter Application Circuit

Crystal X1 operates in fundamental mode and is calibrated for parallel resonance with a load capacitance of 32 pF. The final output frequency is produced through frequency multiplication within the MC2833 integrated circuit (IC). The RF output buffer at Pin...

Receiver for 50 khz optical transmitter

To achieve maximum range, the receiver should be constructed similarly to a radio receiver front end, as the signals received will exhibit comparable frequency components and amplitudes of the photodiode current. The primary limitation on the receiver's performance is the...

Camera VHF Video Transmitter

This is a simple video transmitter capable of transmitting signals up to 50 meters. It can be utilized with cameras or other video sources and allows viewing on VHF channel analog televisions. The video transmitter operates on a supply voltage...

FM Telephone Bugs

Small telephone bug. It listens to the telephone line on an FM receiver. It is self-powered and has a small part count. Circuit diagram, schematics, electronics project. The small telephone bug is a compact and efficient device designed to intercept audio...

Schematic of The Infrared Rays Wireless Headphone

The transmitter circuit for inductive headphones must be installed on a wall or ceiling, limiting their use outdoors. This is a significant drawback of inductive headphones. In contrast, infrared wireless headphones do not have this limitation; their flexible infrared transmitter...

Direct FM

For this project, the 1 1/4 meter Midland 13-509 is chosen, primarily due to its application in various transparent links that support the SRG 147.20 repeater. Initially, several components that are unnecessary or that may hinder reliability and performance will...

Schematic Diagram VHF UHF Low-Noise amplifier circuit

A simple, low-cost, and ultra-compact VHF/UHF low-noise amplifier circuit can be designed using the MAX2664 and MAX2665 ultra-compact LNAs for VHF/UHF applications. These devices incorporate a broadband LNA with an integrated bypass switch. The MAX2664 covers the UHF frequency range...

Tv modulator

The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with a tapped inductor L1 and a trimmer capacitor C1 forming the tank circuit. Adjusting C1 determines the frequency. Capacitor C2...

Carport wireless alarm circuit a

The alarm circuit is composed of two main components: the transmitter and the receiver. The transmitter circuit, as illustrated in Figure A, features a smoke break reed switch labeled GT. When a magnet approaches the GT, the internal contacts open....