Monday, 11 April 2016

Breadboard Projects: The Musical Bell (DIY)

Detailed Instructions:

Description: This is simple project that can be made easily in five minutes. It is a musical bell that produces a melodious sound just like doorbells. It uses the um66 ic popularly known as the melody ic which has a built in oscillator and an amplifier which can directly drive a buzzer but needs an external circuit to drive a speaker. The supply voltage if the ic is 1.5 - 4.5v so cannot be powered by a 9v battery.

Instructions: Connect everything to the breadboard according to the layout given above. Refer to the images above for the pin configurations of the transistor as well as the ic. Connect a battery holder with 2 AA or AAA batteries to the power rails of the breadboard. Do not connect a 9v battery as it would burn the ic. On switching it on, a musical sound will be heard.

Difficulty: Easy
Parts List:
• 1x UM66 ic
• 1x bc547 or 2n2222 or 2n3904 transistor
• 1x 1K resistor
• 1x 8 ohm speaker
• 2x AA or AAA batteries
• 1x Battery holder

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