Ultrasound Detector with 567PLL and LM386 ICs


Posted on Aug 6, 2012

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.


Ultrasound Detector with 567PLL and LM386 ICs
Click here to download the full size of the above Circuit.

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] khz The two signals are mixed at Q3 to produce both a signal in the audio range and higher frequencies that are the




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Fighting Robot circuit
Encoder-decoder
AR envelope generator
Low Frequency Sine wave Generators Schematic
serial communication on atmega3216
UM95088 TelephoneCircuit
CD4011 dual-produced sound and light control delay lamp circuit
Nature simulator with 555 circuit
TDA3910 Internal Block Diagram



Top