This circuit can be used as an automatic timer switch, and the switching time can be adjusted independently.JP1 can output switch signals controlled by relays, and JP2 can output rectangular pulses.
Key Components Introduction:
Its core circuit is NE555. The key component of is 2M ohm high quality glass glaze adjustable resistance, which can easily be adjusted for long time delay.Its output is controlled by 5V relay, and the indicator light adopts 5mm two-color light-emitting diode, which has dual functions of power indication and work instruction.
The 1.5mm high quality circuit board adopts full process processing, the welding disk is enlarged, the wire is thicker, the element layout is beautiful. It is specially designed for practical training, it is easy to withstand multiple times and repeatedly dissoldering, which can improve the efficiency of use and high cost performance.
The circuit can output automatic timing switch signal and rectangular pulse signal.Turn on and off time independently adjustable. It is the core circuit of the base circuit U1 at the time of NE555. It is a typical bistable working mode. Its timing capacitance is c1-4 in parallel. You can easily select your own suitable capacitor installation. There are four capacitors in the package, and you can install one of them in practice. With 10-100 pf ceramics capacitor is suitable for generating high frequency signal, and a good stability of tantalum electrolytic capacitor is suitable for the switch signals generate stable precision, a large capacity 470 uf electrolytic capacitor is suitable for long time delay time signal. The capacitance of the charging resistor makes R1, RP1, and capacitance together determine the length of the shutdown. The RP2 is the discharge resistance, which determines the time of startup and can be adjusted independently. The time can be estimated by the formula T=0.7 RC, but the actual use is not completely consistent with the factors such as capacitor leakage, diode pressure drop and component error.
The output signal of NE555 is the direct output of the rectangle pulse through JP2, which is operated by the VT1 driving relay. The switching signal is output from JP1, and the selection of the normally open point can be determined according to need.You can directly drive any appliance within 220V/ 3A, and realize the automatic timer switch (such as the refrigerator thermostat). The coil voltage of the relay is 5V by default, and the measured 4-12V can be obtained. If you work long hours at high pressure, suggest replacing a 9-12Vrelay. The LED is a dual-color light-emitting diode, and the green light is used as indicator light. The traffic light is bright when it is switched on, and the whole is orange. The whole circuit DC4-12V can work.
|NO.||Component Name||PCB Marker||Parameter||QTY|
|2||Electrolytic Capacitor||C2-C4||Any value||3|
|5||Metal Film Resistor||R1,R3||200ohm||2|
|6||Metal Film Resistor||R2,R4||1K||2|
I. Tested by ICStation's Outstanding Partner bzoli5706:
Learn More Details in the Video:
(The language in the video is English)
II. Tested by ICStation's Outstanding Partner arduinoLab:
Learn More Details in the Video:
(The language in the video is Russian)
First we should say that ICStation doesn't accept any form of pay on delivery.Items used to be shipped after receiving the order info and payment.
1) Paypal Payment
PayPal is a secure and trusted payment processing service that allows you to shop online. PayPal can be used at icstation.com to purchase items by Credit Card (Visa, MasterCard, Discover, and American Express), Debit Card , or E-check (i.e. using your regular Bank Account).
We are PayPal Verified
2) West Union
We know that some of you do not have the Paypal account.
Bank Transfer / Wire Transfer / T/T payment methods are accepted for orders which the total price is up to US$500. The bank will charge about US$60 for the transfer fee if we do the payment in these ways.
For other payment method, please contact us at firstname.lastname@example.org for more details.
1. Hongkong / Sinapore Airmail
(1) Due to the high risk of package lost recently, we have to stop using the free shipping way these days. Hope for your kind understanding! And the $3 is for tracking number and delivery insurance ^0^ Enjoy order from us.
Free Shipping for all orders over $20 ^0^ (with free tracking number and delivery insurance fee)
(2) Shipping time
Shipping time is 7-20 business days to most of countries; please view below table for exactly shipping time to your location.
7-15 working days to: Most of Asia countries
10-16 working days to: USA , Canada , Australia , UK , Most of Europe countries
13-20 working days to: Germany , Russia
18-25 working days to: France , Italy , Spain , South Africa
20-45 working days to: Brazil , Most of South America countries
2. EMS/DHL/UPS Express
(1)Shipping Fee: Free for the order which meet the following requirements
Total price of the order >= 200USD or Total weight of the order >= 2.2KG
When the order meets to one of the above requirement, it will be shipped for FREE via EMS/DHL/UPS Express to below country.
Asia: Japan , South Korea , Mongolia . Malaysia , Singapore , Thailand , Vietnam , Cambodia , Indonesia , Philippines
Oceania: Australia , New Zealand , Papua New Guinea
Europe& America: Belgium, Britain, Denmark, Finland, Greece, Ireland, Italy, Luxembourg, Malta, Norway, Portugal, Switzerland, Germany, Sweden, France, Spain, USA, Austria, Canada
Note: Shipping Fee to other countries, please contact orders@ICStation.com
(2) Shipping Time
Shipping time is 3-5 working day (about 1 week) to most of countries.
Because the package would be returned to the sender if it had not been signed by the receiver in 2-3 day (DHL) or 1 week (EMS,) or 2 weeks (Registered Email), please pay attention to the arriving time of the package.
1) APO and PO Box Addresses
1) Delivery Time of mixed orders with items in different Shipping Status should be calculated using the longest estimate times listed.
2) Chinese Holiday Reminder: During annual Chinese holidays, services from certain suppliers and carriers may be affected, and delivery for orders placed around the following times may be delayed by 3 - 7 days: Chinese New Year; Chinese National Day,etc.
3) Once your order is shipped, you will receive an email notification from icstation.com
4) Track the order which with tracking number via below links: