Position: Index > Sensor Circuit >

Ultrasound Detector with 567PLL and LM386 ICs

2014-11-04 20:36  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

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 but here its input is grounded and its voltage controlled oscillator is used as a precision oscillator. visit page.Ultrasound Detector with 567PLL and LM386 ICs - schematic
The oscillator frequency is given by f = 1/(1.1*C4*(R10 + R12)) = 1/(1.1*0.0022*10-6*(4.7 + [0-50])*103) = [88-7.5] khzThe two signals are mixed at Q3 to produce both a signal in the audio range and higher frequencies that are the visit page.