No description available.
The phototransistor Q1 (Radio Shack 276-130) activates a voltage change across resistor R2, which is then amplified by an operational amplifier (op-amp). The output from the op-amp drives an array of five LEDs, creating a bar graph voltage indicator....
This document describes a simple 2.4 GHz SWR meter that utilizes surplus microwave hardware. The main component is a MECA -20/-20 dB Directional Coupler, which operates within a frequency range of approximately 700 MHz to 2.5 GHz. This directional...
A small transmitter board interfaces with a microcontroller and conductivity probe to measure liquid conductance and conductivity. Precise equations and measurements are provided for this microcontroller-controlled conductivity meter. The described circuit consists of a compact transmitter board that serves as...
This thermometer employs an LM19 sensor, calibrated to measure a broad temperature range of -55 to 130 degrees Celsius (-67 to 266 degrees Fahrenheit) for outdoor temperature readings. For indoor temperature and humidity measurements, it utilizes an SHT21 digital...
This project describes a little QRP transceiver full legal power (5 W at 12 V) for the 40 meters band. The RIG may be built in a gradual manner; in fact, it is divided into two main modules, or...
The circuit diagram illustrates a straightforward circuit design featuring 10 LEDs. It employs a series of half-wave rectification using the precision IC2 TL071, along with a single LM3915 IC that regulates the LEDs, functioning as a VU meter indicator....
We use cookies to enhance your experience, analyze traffic, and serve personalized ads. By clicking "Accept", you agree to our use of cookies. Learn more