Schematic Power Amplifier and Layout

Electronics Schematic Diagram alarm Door Bell circuit using NE555

The main part of this doorbell circuit are two NE555 timer ICs.When some one presses switch S1 momentarily ,the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1.

When the switch S1 pressed, IC1 is triggered at its pin 2 and output pin 3 goes high for a time period previously set by the values of POT R4 and POT R5.

Electronics Schematic Diagram 6-10W stereo power audio amplifier with IC TDA2005

Component list:

R1, R9 ________ 1K ohm
R2 ____________ 120K ohm
R3, R4 ________ 1K2 ohm
R5, R6 ________ 33 ohm
R7, R8 ________ 1 ohm

IC ____________ TDA2005
Pot ___________ 10K ohm stereo

C1 C2 __________ 2u2/50V
C3 _____________ 10uF/25V
C5, C6, C8 _____ 100uF/25V
C7, C9 _________ 220uF/25V
C12, C13 _______ 2200uF/16V
C4 _____________ 100nF
C10, C11 _______ 100nF