ELECTRONIC HARMONIUM

1TP017

2B-ELECTRONIC HARMONIUM

PROJECT SPECIALITIES

This project can be used as a toy, with the help of this, the children can also be acquainted with different tunes. You can also convert it to a musical bell by adding IC 4017 to the circuit.

TECHNICAL DESCRIIPTION AND WORKING:-

 

This project has been developed and successfully tested OK in TV Engineer Technical Lab.

Electronic Harmonium based on IC 555 is an astonishing fact in the world of electronics. The circuit given below is very simple and cost of assembling is very low. It produces 15 different tunes. Once you touch the probe with different resistance the circuit produces 15 different tunes. It works on 9 V DC which is supplied to pin no 4 & 8 of IC 555. The Project can be fitted in MW pocket transistor cabinet and multimeter prod. can be used as a probe. This project gives very good result on 9V DC.

PRECAUTIONS WHILE ASSEMBLING THE PROJECT:-

  1. Use IC base for mounting IC.
  2. Use resistance manufactured by PHILIPS otherwise the tunes may change.

3 Check polarity of electrolytic capacitor before soldering.

LIST OF COMPONENTS:

IC 555 1

SPEAKER 8 Ohm 1

MULTIMETER PROD 1

CAPACITORS:

C2  .0002mfd/100V 1

C3  .01 mfd/100V 1

10 mfd/25V 1

RESISTANCE [ALL 1/4 WATTS]

R1 R2 R4  68K 3

R5 R6  47K 2

R8  39K 1

R9 R11 R3  33K 3

R10  18K 1

R7,R12,R13  22K 3

R14  12K 1

R15  180K 1

R16  10K 1