Monday Kids Analog Circuit Theory Learning Kits - Use Resistors Capacitors Transistors to Build a Sound Control Logic Circuit

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  • Brand Name: Monday Kids
  • Condition: New
  • Type: Logic ICs
  • Operating Temperature: none
  • Supply Voltage: 4.5 ~ 5V
  • is_customized: Yes
  • Dissipation Power: -20 ~ 60 Celsius
  • Application: Electronic Circuit

Clap switch kit is composed of a number of resistors, capacitors and transistor amplifier circuit. Circuit is simple, welding easy, inexpensive, and can be widely used in voice-activated switch.

This circuit mainly by the audio amplifier circuit and a flip-flop circuit.

VCC: Connect 5V power supply positive (according to the relay voltage)

GND: Connect 5V power supply negative
IN: relay module signal trigger (low level active)

1. Characteristics

Operating voltage: 4.5 ~ 5V
PCB size: 28 * 49mm


2. Circuit theory


This circuit is mainly assembled by the audio amplifier circuit and a flip-flop circuit.
Q1 and Q2 form a secondary audio amplifier, an audio signal received from MK1 C1 is coupled to the base of Q1, the amplification is fed directly from the collector to the base of Q2, the collector of Q2 to obtain a negative square wave with to trigger the bistable circuit. R1, C1 limit the frequency response of the circuit for the high sensitivity range of about 1kHz. When the power is turned on, the state of the bistable circuit is off Q4, Q3 saturated, D3 does not shine. When MK1 generates a control signal output after the two-stage amplification of a negative square wave, after the differential processing by the negative spike D1 added to the base of Q3, the circuit rapidly inverted, D3 is illuminated. When MK1 again received control signal, the circuit took place flip, D3 extinguished. The board reserved for external control devices connected to terminals J2, can be a voice for other devices connected via J2 relay. (When connected to both ends of the relay coil relay to be anti and a diode)

This circuit uses a DC 4.5 to 5V power supply, turn off the machine when the LED current of 3 mA, the LED lights up the whole current of 6mA.



4. Component list:

serial number

components

value

label

serial number

components

Value

label

01

resistance

470

R7

10

capacitance

1uF/50V

C2

02

1K

R14

11

47uF/16V

C4

03

2.2K

R1 R8 R12

12

diode

1N4148

D1 D2

04

4.7K

R4 R6

13

LED

 red

D3

05

10K

R5,R8,R10 ,R11,R13

14

Transistor

9013

Q1----Q4

06

47K

R3

15

Microphone

9767

MK1

07

470K

R2

16

terminal

2.54 2P

J1

08

capacitance

103

C3

17

power line

2.54 2P

1

09

104

C1 C5 C6

18

PCB

FR-4 28*49

1


  • Unit Type: piece
  • Package Weight: 0.02kg (0.04lb.)
  • Package Size: 15cm x 12cm x 10cm (5.91in x 4.72in x 3.94in)

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