Build Your Own Melody Door Ringer Circuit – 7413 & BC550
Description
Within numerous residences, chime mechanisms are commonly found at entrances. Individuals are granted the ability to adjust both the amplitude and pitch of these sounds. This particular circuit offers precisely that functionality. Utilizing materials surrounding the entrance, a variety of frequencies – approximately 5 kHz and 2 kHz – can be generated. The circuit’s operation is dependent on the momentary press of a switch. Concurrently with the auditory signal, a visual indication is provided by the LED D2. By altering the capacitance values of capacitors C2 and C3, which vary in price and capacity, distinct sounds are produced.
Circuit Diagram
Part List
- R1=470Kohm
- R2=22Kohm
- R3=3.9Kohm
- R4-5=330 ohm
- R6=2.2Kohm
- R7=1.2Kohm
- C1=22uF 25V
- C2=470uF 25V
- C3=1 uF 25V
- D1=1N4001
- D2=LED RED 3mm
- IC1=7413
- Q1-3= BC 550
- Q2= BC 560
- BATT=4X1,5V or external pack 6Vdc
- SP= Speaker 8R /0,5W
All Resistors are 1/4W 5%
Integrated Circuit Details
The 7413 is a versatile operational amplifier (op-amp) IC, produced by Texas Instruments. It is a three-terminal integrated circuit that is widely used in various analog circuit applications. This op-amp offers high open-loop gain, low input offset current, and low input noise. The 7413 is typically used in circuits requiring amplification, filtering, or signal conditioning. It has a single supply operation with a typical supply voltage of ±15V, but can also be powered from a single supply. The IC provides a stable and accurate output, making it suitable for precision applications. The 7413 is a fundamental building block in countless electronic circuits and is used extensively in educational and industrial settings.