Doorbell Suite Electronic Production Door Bell NE555 Ch DIY Kit

Doorbell Suite Electronic Production Door Bell NE555 Ch DIY Kit

Features: 100% and high quality Ding dong doorbell switch s1 is push on switch on the door, without pre the switch, the capacitance cannot be connected is not recharged, and capacitance voltage of 0 v, the reset has been in a low level condition, leading to the speaker doesn't work.When closed switch s1, the VCC current through the diode for charging, make its both ends of the voltage, and reset voltage also began to rise gradually.When the voltage of the capacitance increased to higher levels, namely the reset input port is the high level, the timer starts, composed of resistance, capacitance and diode oscillator start work, output frequency for f1.When disconnecting switch s1, resistance and capacitance circuit, began to discharge.At the same time composed of resistance, capacitance and diode oscillator start work, output frequency for ` 2 f.Restore low level is reset when the discharge end, timer stop working. In the speaker output termination, output current will make the speaker voice.Output frequency is not at the same time, the sound is different.This circuit has two kinds of different frequency, so the speaker will be iued a "ding" "dong" two kinds of different sounds. Specifications: Package Name: NE555 doorbell kit Working voltage: 4.0-7.0V size: 28mm (L) *25mm (W) Kit horn: 8 Ohm 0.25W Color: Beige Net Weight: 15g Package Includes: 1* 8 Ohm 0.25W horn 2* 100MM red line 2* 100MM black line 1* NE555 ch 1* 8P IC block 1* 100UF 25V Capacitance 1* 10UF 25V Capacitance 1* 6*6*5 keystroke 3* 103 ceramic s 5* 47K resistance 2* 1N4148

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Shping and Pack All it will be double checked and well packed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for e areas,it may take a little longer). 

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