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Category: Audio Circuits / Ultrasonic Circuits Views: 13 Rank: 5 Combine an electrostatic transducer with an ultrasonic transceiver IC to build a ranging system that senses objects at distances from 4 inches to more than 30 feet. Transducer Yl `s broadband characteristic simplifies tuning. The secondary of T1 resonates with the 500-pF capacitor Cl at a frequency between 50 and 60 kHz.  You tune L1 to this frequency by using an oscilloscope to note the maximum echo sensitivity at pin 1. Step-up transformer T1 provjdes 150-V bias for the transducer.
Related circuits Low-intensity ultrasonic sound waves in the 30-45 kHz frequency band repel insects and small rodents. The unit is designed to generate a swept square wave from 30 to 45 kHz. The LM555 IC is wired as an ultrasonic oscillator driving a piezoelectric speaker of the hi-fi super-tweeter type The LM1812 is a complete ultrasonic transceiver on a chip designed for use in a variety of pulse-echo ranging applications. The chip operates by transmitting a burst of oscillations with a transducer, then using the same transducer to listen for a return echo. Ifan echo of sufficient amplitude... Using two NE555 timer IC devices, this circuit generates either pulsed or continuous ultrasonic signals. The value The Class A series resonant inverter portrayed is well-known and respected for its high efficiency, low cost, and small size, provided that operating frequency is greater than about 3 kHz. In the 555 oscillator circuit, adjusting R2 will provide output frequencies from below 200 Hz to above 62 kHz The piezo speaker, MICl, picks up the incoming ultrasonic signal and feeds it to the base of Ql. The two-transistor booster amplifier, Ql and Q2, raises the signal to a level that is sufficient to drive one input of this most unusual mixer circuit. Integrated circuit U2, a quad bilateral... It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can't hear these high-frequency sounds. Unfortunately, all pests do not react at the same ultrasonic frequency. While some pests get repelled at 35 kHz, some others... without significant added complexity, and a natural tendency to run away under no-load (high Q) conditions. The 20-kHz control circuit (see Fig. 2) overcomes these shortcomings hy feeding back into the asymmetrical thyristor trigger pulse generators (see Fig. 3) signals that simultaneously shut...
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The D.C. Circuit is among the most underworked court in the federal system. Lawyers can under most statutes now bring challenges to federal agencies in ... Owing to its exclusive jurisdiction over many complicated areas of administrative law, the D.C. Circuit hears the vast majority of challenges...
This circuit is intended to control a heating system or central heating plan, keeping constant indoor temperature in spite of wide range changes in the outdoor one. Two sensors are needed: one placed outdoors, in order to ...
Over March and April, the HSE's business incubator ran a competition to determine the best business teams to admit to the finals, selecting 14 companies in industries ranging from educational technology to hospitality and ...
VLSI is used to design integrated circuits by combining millions and billions of transistors into a single chip, and involves various design activities ranging from specification to tape-out of the chip. VLSI results in reduced sizes ...
Each of the 22 stops in Season 10 will offer 12 ring events with buy-ins ranging from $365 to $1,675. Each WSOP Circuit stop Main Event winner will receive an automatic berth into the WSOP Circuit National Championship, ...
At the same time, they aim to expand its range of application. The idea behind this is to reduce the circuit's surface and power consumption through System-on-Chip (SoC) integration combined with component stacking.
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Equus 3320 Auto-Ranging Digital Multimeter
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