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Simple Door Bell Circuit

2015-01-12 21:53  
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Here this door bell circuit. this made around IC 8021-2. The sound is stored in a 4 bit ROM.a complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audibility. A piezo tweeter or an 8-ohm, 500mW speaker can be used at the output. Here is a schematic drawing:

Simple Door Bell Circuit Simple Door Bell Circuit

IC 8021 Features
- 1.3V to 3.3V operating voltage and low power consumption
- One-shot mode of 2 ding-dong playing sequences
- Standard TO-92 package form
- Dynamic speaker can be driven with external NPN transistor

IC 8021 Absolute Maximum Ratings
DC Supply Voltage ……………………………………. -0.3V to 5.0V
Operating Ambient Temperature ……………….. -10°C to 60°C
Storage Temperature ………………………………… -55°C to 125°C








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