This simple circuit an low cost ding
dong bell suitable for calling bell purposes.
It is made around IC 8021-2 . IC 8021 has an in-built circuitry to produce ding
dong sound each time its pin 3 is pulled low. 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.
List Component bel Rumah:
R1: 1K 1/4W Resistance
C1: 10µF/12-25V Electrolytic Capacitance
T1: BC548/c8050 NPN transistor
T2: BC557/C8550 PNP transistor
IC1: 8021-2 ding dong sound generator
Ls1: Speaker tweeter 500 Mwatt - 5 watt
S1: switch on/off
S2: Switch Normally close
B1: 3V Cell
R1: 1K 1/4W Resistance
C1: 10µF/12-25V Electrolytic Capacitance
T1: BC548/c8050 NPN transistor
T2: BC557/C8550 PNP transistor
IC1: 8021-2 ding dong sound generator
Ls1: Speaker tweeter 500 Mwatt - 5 watt
S1: switch on/off
S2: Switch Normally close
B1: 3V Cell
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