INTRODUCTION

Hearing aid machine with constant volume is a battery powered electronics device that makes listening easier for people with hearing loss, consist of microphone, amplifier and receiver.

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RESISTORS, R1&R9
10K 1/4W

RESISTOR, R2
1M 1/4W

RESISTOR, R3
4K7 1/4W

RESISTORS, R4&R7
100K 1/4W

RESISTOR, R5
3K9 1/4W

RESISTOR, R6
1K5 1/4W

RESISTOR, R8
100R 1/4W

POTENTIOMETER
P1=22K

CAPACITORS,C1 &C2
100nF63VCER/POLY

CAPACITORS,C3 &C6
1uF 63VCER/POLY

CAPACITOR, C4
10uF 25V ELECTR

CAPACITOR, C5
470uF 25 ELECTR

TRANSISTORS,Q1,
Q2 & Q3
BC 547 45V 100mA
NPN

TRANSISTOR, Q4
BC 337 45V 800mA
NPN

MIC1
Miniature electric
microphone

SW1
SPST Switch

J1
Stereo 3mm Jack socket


B1
1.5V Battery

DIODE, D1
IN414875V150mA

CONCLUSION
The preliminary test of the circuit in proteus shows the circuit will operate after prototype building which will provide quality sound to hearing loss.

By luala

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