Ultrasound Sonic Heterodyne Receiver circuit

The unit consists of a sensor, timer, and electric water pump. The sensor is embedded in the soil, and when dry, the electronics operate the water pump for a preset time. The circuit is composed of a level-sensitive Schmitt trigger,...

Ultrasound Detector with 567PLL and LM386 ICs

The bat ultrasounds are picked up by the microphone SPKR1 and go through two stages of amplification at Q1 and Q2. Separately, a tunable (R12) single frequency is produced by the LM567 oscillator U1. The LM567 is a tone decoder...

Radio circuits built

This receiver is a modification of Charles Wenzel's Two Transistor Reflex Radio. Instead of a ferrite AM loopstick antenna, a magnetic loop antenna is used, and an LM386 amplifier stage has been added to drive an 8-ohm speaker. A switch...

Advances in Measurement & Sensor Tech

This issue features articles on various measurement and sensor-related embedded design projects. Readers are encouraged to attempt similar projects and share their results. Starting on page 14, Petre Tzvetanov Petrov describes a multilevel audible logical probe design. Petrov notes that...

Sensor-Activated Relay Pulser Circuit

A sensor activates transistor Q1 to turn on the low-frequency 555 oscillator, which generates pulses to control LAMP II. The sensor may respond to variations in light or temperature. Either resistor RA or RB can function as the sensor, depending...

Conversion Receiver For 160 To 20M Circuit

Note that T1 and T2 are TOKO components, including part numbers for the coils T1 and T2. The direct-conversion receiver shown utilizes a double-tuned input network made from readily available TOKO coils. IC1, an NE602, serves as a voltage-controlled oscillator...

signal Can someone break down how this receiver works

The circuit described is a toy car receiver, which operates similarly to the transmitter but in reverse and with additional filtering. The receiver is tuned to a frequency of 27.145 MHz to capture signals at this frequency. Following the initial...

ProfiLab-Expert 4.0

The ProfiLab-Expert software allows you to develop your own digital or analogue measuring technology projects. It doesn't matter if you want to create analogue measurements or digital controls - you can realize it all. And for all this you don't...

Ultrasound Sensor

The Ping is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3 m). It works by sending out a burst of ultrasound and listening...