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Bells ring Generator CIRCUIT (MC14106)

2016-02-19 02:32  
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Three circuit options

Circuit diagram:

Bells ring

Parts:

R1,R3,R7,R9,R13_10K   1/4W Resistors
R2_______________1M5  1/4W Resistor
R4______________27K   1/4W Resistor
R5,R11__________47K   1/4W Resistors
R6,R12_________220K   1/4W Resistors
R8_______________2M2  1/4W Resistor
R10_____________33K   1/4W Resistor

C1_______________2µ2  25V Electrolytic Capacitor
C2______________47µF  25V Electrolytic Capacitor
C3,C8___________10µF  25V Electrolytic Capacitors
C4,C7___________10nF  63V Polyester Capacitors
C5,C6__________100nF  63V Polyester Capacitors

D1-D5_________1N4148  75V 150mA Diodes

IC1__________MC14106 or 40106 Hex Schmitt Inverter IC

Q1_____________BC337  45V 800mA NPN Transistor
Q2,Q3,Q5_______BC238  25V 100mA NPN Transistors
Q4 ____________BC327  45V 800mA PNP Transistor

PH______________Photo resistor (any type) (see Notes)

P1______________SPST Pushbutton (see Notes)

SW1_____________SPST Switch

SPKR____________8 Ohm Loudspeaker

B1______________3V Battery (two 1.5V AA or AAA cells in series etc.)

This article introduces the Bells ring Generator CIRCUIT (MC14106). The content is very simple, but very useful. An understanding of the components in the article can help you better understand the article. In this article, for example, you can go to understand and purchase these components:MC14106.

Parts added to optional modification:

R14____________220K   1/4W Resistor
R15______________1M   1/4W Resistor

C9_______________4µ7  25V Electrolytic Capacitor
C10______________1µF  25V Electrolytic Capacitor

This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit different needs.

The circuit as shown in the diagram generates a “Ding-tone” when P1 is pressed and a “Dong-tone” when P1 is released. IC1D is the first-tone frequency generator and IC1F generates the second-tone.
Q2, Q5 and related components act as shape and decay controls of the two tones, trying to imitate as close as possible the bells sound. Their outputs are mixed (R7 & R13), filtered (C5) and boosted by a simple class-A audio amplifier (Q3 & Q4) in order to drive the loudspeaker. The amplifier is switched-on by Q1 when P1 is pressed, then is switched-off some seconds after P1 is released: this time-delay is fixed by C1 & R2. In this way the circuit will draw a negligible current when in stand-by mode.

 


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