Description:
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:
Working voltage: 4.0-7.0V
PCB size: 28mm (L) *25mm (W)
Kit horn: 8 Ohm 0.25W
Color: Beige
Net Weight: 15g
Package Included:
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
2.All major credit cards are accepted through secure payment processor PayPal.
1. We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
2. Items will be shipped within 2-5 business days when we received payment.(exclusive holidays or weekends)
3. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer responsibility.Please check with your country customs office to determine what these additional costs will be prior to bidding/buying.
4. Delivery time depends on destination and other factors, normally it would sooner than the ETA if it can go smoothly through customs.
1. 30-day Free return
2. For any problems caused by our side, Pls contact us first.We will provide a best resolution for you.
3. Pls do not open a return request before contacting us!
4. Any other returns, parcel must in good condition and original package.
1. If you are satisfied with the items and our service, please take a minute to leave us a positive feedback, we are glad to leave positive feedback to you automatically after payment cleared.
2. Please do not hesitate to contact us to get a better solution before you leave a neutral or negative feedback, even open a case, we will provide you the best service.
3. We' re always with you, sincerely thanks not to leave neutral/negative feedback or open a case before receiving our replies, thanks to consider our working time so maybe we couldn’t reply to you in a timely manner.
2.All major credit cards are accepted through secure payment processor PayPal.
1. We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
2. Items will be shipped within 2-5 business days when we received payment.(exclusive holidays or weekends)
3. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer responsibility.Please check with your country customs office to determine what these additional costs will be prior to bidding/buying.
4. Delivery time depends on destination and other factors, normally it would sooner than the ETA if it can go smoothly through customs.
1. 30-day Free return
2. For any problems caused by our side, Pls contact us first.We will provide a best resolution for you.
3. Pls do not open a return request before contacting us!
4. Any other returns, parcel must in good condition and original package.
1. If you are satisfied with the items and our service, please take a minute to leave us a positive feedback, we are glad to leave positive feedback to you automatically after payment cleared.
2. Please do not hesitate to contact us to get a better solution before you leave a neutral or negative feedback, even open a case, we will provide you the best service.
3. We' re always with you, sincerely thanks not to leave neutral/negative feedback or open a case before receiving our replies, thanks to consider our working time so maybe we couldn’t reply to you in a timely manner.
