Make a Doorbell with Indicators
| Audio - Amplifier |
This circuit is a multi-switch input musical doorbell. This circuit is built around the popular and low cast auad D-latch CD4042B IC. 
Parts list:
1. Resistor ---------------------- R1 to R5 --------------------- 100K
2. Resistor ---------------------- R6 to R9 --------------------- 1K
3. Capacitor -------------------- C1 ------------------------------ 0.1 F
4. Transistor -------------------- T1 ------------------------------ SL100B
5. Integrated circuit ---------- IC2(N1-N2) ------------------ CD4002B
6. Integrated circuit ---------- IC1 ----------------------------- CD4042B
7.Switch -------------------------- S1-S4 ------------------------ Push-to-on tactile switch
8.Switch -------------------------- S5,S6 ------------------------ Normal switch
9. Mic ------------------------------ BZ1 --------------------------- Musical Buzzer (6V-12VDC)
Read more about doorbell cicuit . 1.
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Last Updated (Wednesday, 27 January 2010 21:42)