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A Whistle Responder circuit diagram

2017-08-09 02:42  
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 This article is a flute transponder circuit diagram. The principle is simple and very practical. Want more thoroughly grasp the principle, you should understand and be familiar with the major components of the circuit, such as: BC337, 1n4148 . The equipment off and on for about beep. Two seconds, when a person is in a range of about 10 meters let out a whistle. The first two inverters included in IC1 used for audio amplifier. IC1A amplified signal continuous small electret microphone and receiver IC1B ACTS as a band-pass filter, its frequency is concentrated in about 1.8 KHZ. Filters are required to select a specific frequency, whistle, prevent other operating frequency can lead to abnormal pager. IC1C connection as a Schmitt trigger, edges and corners of the incoming audio signal. IC1D is 2 seconds (approximately) unstable IC1E monostable driver & IC1F formed. The oscillator to produce a 3 to 5 hz square-wave feeding Q1 and BZ1, thus providing the operation of intermittent pager.

Circuit diagram:

Whistle Responder


R1_____________22K   1/4W Resistor
R2_____________10K   1/4W Resistor
R3______________4M7  1/4W Resistor
R4,R8_________100K   1/4W Resistors
R5____________220R   1/4W Resistor
R6____________330K   1/4W Resistor
R7_____________47K   1/4W Resistor
R9______________2M2  1/4W Resistor
R10_____________1M5  1/4W Resistor

C1,C5__________47nF   63V Polyester or Ceramic Capacitors
C2,C3__________10nF   63V Polyester Capacitors
C4,C6___________1μF   63V Electrolytic Capacitors

D1,D2________1N4148  75V 150mA Diodes

IC1____________4049  Hex Inverter IC

Q1____________BC337  45V 800mA NPN Transistor

MIC1_________Miniature electret microphone

BZ1__________Piezo sounder (incorporating 3KHz oscillator)

B1___________2.8 or 3V Battery (see notes)


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