Buzzer Circuit | Electronic Project Circuits

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Buzzer sound with ic UM66T

This is a simple musical doorbell sound or Buzzer sound circuit.When I switch to musical voice out of small speakers. Period of time.This size range power supply 3V,IC number UM66T audio production functions of various Toy Gallery, And increase the delay circuit includes a transistor and capacitor.
Operation of the circuit be When the switch S1, capacitor C1 will charge as fast as a result, Q1, Q2 the bias.Make a strong drop across R3 is a current flowing into pin 2 of IC1. Made IC1 work, If the switch S1 C1 will be discharged, through R1 to Q1.As a result, the lighter music of the period ever release the audio when the switch is based on the value of C1.

Be the first to comment - What do you think? Posted by admin - September 26, 2010 at 6:44 am

Categories: Audio diagram Tags: buzzer circuit, melody generator IC, UM66T

Low Voltage Battery Monitor by LM339

This low voltage circuit can be used to monitor battery and other volatile sources of current for problems. The circuit sounds an alarm and lights an LED, but can be interfaced to any number of other circuits for many different uses.

Description
R1, R3 2 1K 1/4W Resistor
R2 1 5K Pot
U1 1 LM339 Voltage comparator IC
D1 1 1N5233B Zener Diode
D2 1 LED
BZ1 1 Piezo Buzzer
MISC 1 Board, wire, socket for IC

Notes
1. The circuit will operate from 9V to 12V.
2. Adjust R2 until the alarm goes off at the correct voltage.

Source: http://www.ubmthai.com/leksoundsmf3/index.php?topic=6029.30