Doorbell Suite Electronic Production Door Bell DIY Kit NE555 Chip Perfect

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Doorbell Suite Electronic Production Door Bell DIY Kit NE555 Chip Perfect
Product Description
Features:
100% brand new and high quality
Ding dong doorbell switch s1 is push button switch on the door, without press 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 capacitor 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, capacitor 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 capacitor 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 issued a "ding" "dong" two kinds of different sounds.
Specifications:
Package Name: NE555 doorbell kit
Working voltage: 4.0-7.0V
PCB 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 chip
1* 8P IC block
1* 100UF 25V Capacitance
1* 10UF 25V Capacitance
1* 6*6*5 keystroke]
3* 103 ceramic capacitors
5* 47K resistance
2* 1N4148
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Shipping
We ship to Paypal registered address only!
Items will be shipped within 24 hours after payment received.
For Items that shipped from China is send by Airmail, it normally take 15-35 days for delivery
For Items that shipped from UK warehouse is send by Royal Mail
, it normally take 2-5 days for delivery, and
no tax to The European Union!!!
If you do not receive your item after 35 days. please contact us immediately for further assistance. We will be responsible for any damages or losses incurred in the shipping process.
Import duties, value added taxes and any other charges are NOT included in the item price or shipping costs. As an eligible importer,you are responsible for any reasonable tax or any other importation fees.
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About us
Specialized in electronic components and moudels.
Real store, Goods in stock.
Competive price. Good quality
We have more than 8 years experience in international business.have a wealth of experience in shipment. and we work with reliableshipment company, can get good price from DHL in Hongkong.
customer service
1. We take care of all requirements from every single valued customer, like you. Therefore, we do our best to control the quality of each item before sending.
2. In very rare case, if the product is found faulty, please contact us for return or refund.
3. In addition, we offer 30 days unconditional Refund Warranty and 1 Year Manufacturer Warranty.
4. We must be informed if you do not like the device within 7 days upon receiving the item and we will give you a returned merchandise authorization number (RMA). Without (RMA), the buyer will be responsible for any loss of return.
5. All returns must include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms, etc.
6. As we are selling all items on eBay from factory at lowest price, we are unable to refund you shipping and handling costs. Buyer is responsible for shipping costs incurred shipping products back.
Features: 100% brand new and high quality Ding dong doorbell switch s1 is push button switch on the door, without press 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 capacitor 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, capacitor began to discharge.At the same time comp
On Oct-26-17 at 23:32:29 PDT, seller added the following information: