Low-power FM transmitter circuit diagram 1000M range

This is a preselector circuit designed for shortwave (SW) receivers, specifically a do-it-yourself (DIY) high-frequency preselector. The circuit employs a modern low-capacitance MOSFET with two gates, which generates a negative inverse reaction through an uncoupled source resistor. When applied...

Introduction The SP6648 integrated synchronous boost regulator is a compact circuit that provides ultra-high efficiency drive current for an LED flashlight using a Luxeon I light source. The circuit is configured to deliver a constant output current of 350mA...

This circuit generates inaudible ultrasound to create a barrier across an entry point. When the circuit detects a disruption in the sound barrier, it triggers a loud alarm to indicate the entry of a person. This system can be...

A flashing LED indicates the need to water a plant in a 3V powered circuit. This circuit is designed to signal when a plant requires water. A LED flashes at a specified interval. This circuit operates on a 3V power...

This circuit is a 6-zone alarm system designed for independent operation, suitable for small office or home environments. It can be adapted to utilize a combination lock or keypad for setting and resetting the alarm. All zones, Z1 to...

Due to the increased level of the transistor amplifier circuit, the control circuit's performance in Figure 16-6 is more sensitive and can accept input control signals superimposed on others (such as voltage, current, and speed feedback signals) to meet...