Showing posts with label responder. Show all posts
Showing posts with label responder. Show all posts
Friday, August 22, 2014
Simple Whistle Responder Schematic Wiring diagram Schematic
Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained a special purpose IC and therefore were not suited to home construction. The present schema is designed around a general purpose hex-inverter CMos IC and, using miniature components and button clock-type batteries can be enclosed in a matchbox. It is primarily a gadget, but everyone will be able to find suitable applications.
Circuit operation:
This device beeps intermittently for about two seconds when a person in a range of around 10 meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small electret-microphone and IC1B acts as a band-pass filter, its frequency being centered at about 1.8KHz. The filter is required in order to select a specific frequency, the whistles one, stopping other frequencies that would cause undesired beeper operation. IC1C is wired as a Schmitt trigger, squaring the incoming audio signal. IC1D is a 2 second-delay monostable driving the astable formed by IC1E & IC1F. This oscillator generates a 3 to 5Hz square wave feeding Q1 and BZ1, thus providing intermittent beeper operation.
This device beeps intermittently for about two seconds when a person in a range of around 10 meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small electret-microphone and IC1B acts as a band-pass filter, its frequency being centered at about 1.8KHz. The filter is required in order to select a specific frequency, the whistles one, stopping other frequencies that would cause undesired beeper operation. IC1C is wired as a Schmitt trigger, squaring the incoming audio signal. IC1D is a 2 second-delay monostable driving the astable formed by IC1E & IC1F. This oscillator generates a 3 to 5Hz square wave feeding Q1 and BZ1, thus providing intermittent beeper operation.
Simple Whistle Responder Circuit diagram:
Whistle Responder Circuit Diagram
Parts:
R1 = 22K 1/4W Resistor
R2 = 10K 1/4W Resistor
R3 = 4M7 1/4W Resistor
R4 = 100K 1/4W Resistors
R5 = 220R 1/4W Resistor
R6 = 330K 1/4W Resistor
R7 = 47K 1/4W Resistor
R8 = 100K 1/4W Resistors
R9 = 2M2 1/4W Resistor
R10 = 1M5 1/4W Resistor
C1 = 47nF 63V Polyester or Ceramic Capacitors
C2 = 10nF 63V Polyester Capacitors
C3 = 10nF 63V Polyester Capacitors
C4 = 1µF 63V Electrolytic Capacitors
C6 = 1µF 63V Electrolytic Capacitors
C5 = 47nF 63V Polyester or Ceramic Capacitors
D1 = 1N4148 75V 150mA Diodes
D2 = 1N4148 75V 150mA Diodes
Q1 = BC337 45V 800mA NPN Transistor
B1 = 2.8 or 3V Battery (see notes)
IC1 = 4049 Hex Inverter IC
BZ1 = Piezo sounder (incorporating 3KHz oscillator)
MIC1 = Miniature electret microphone
Notes:
R1 = 22K 1/4W Resistor
R2 = 10K 1/4W Resistor
R3 = 4M7 1/4W Resistor
R4 = 100K 1/4W Resistors
R5 = 220R 1/4W Resistor
R6 = 330K 1/4W Resistor
R7 = 47K 1/4W Resistor
R8 = 100K 1/4W Resistors
R9 = 2M2 1/4W Resistor
R10 = 1M5 1/4W Resistor
C1 = 47nF 63V Polyester or Ceramic Capacitors
C2 = 10nF 63V Polyester Capacitors
C3 = 10nF 63V Polyester Capacitors
C4 = 1µF 63V Electrolytic Capacitors
C6 = 1µF 63V Electrolytic Capacitors
C5 = 47nF 63V Polyester or Ceramic Capacitors
D1 = 1N4148 75V 150mA Diodes
D2 = 1N4148 75V 150mA Diodes
Q1 = BC337 45V 800mA NPN Transistor
B1 = 2.8 or 3V Battery (see notes)
IC1 = 4049 Hex Inverter IC
BZ1 = Piezo sounder (incorporating 3KHz oscillator)
MIC1 = Miniature electret microphone
Notes:
- Power supply range: 2.6 to 3.6 Volts.
- Standing current: 150µA.
- Depending on dimensions of your box, you can choose from a wide variety of battery types:
- 2 x 1.5 V batteries type: AA, AAA, AAAA, button clock-type, photo-camera type & others.
- 2 x 1.4 V mercury batteries, button clock-type.
- 1 x 3 V or 1 x 3.6 V Lithium cells.
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