![]() ![]() ![]() Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. If you need to exchange it for the same item, send us an email at for assistance. We only replace items if they are defective or damaged. Note: We do not accept the change of mind return or refund, Please choose the product carefully. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.Ĭustomer will responsible for return and will pay for return shipping cost. Several types of goods are exempt from being returned, like health & beauty products, perishable goods such as food, flowers, newspapers or magazines cannot be returned. It must also be in the original packaging(if any). To be eligible for a return, your item must be unused and in the same condition that you received it. If 14 days have gone by since your purchase, unfortunately, we can’t offer you a refund or exchange, unless otherwise stated in law. You don't need to worry about the polarity of the LED because, the frequency of the current is so high that the human eye won't be able to identify the blinking effect ( due to persistence of vision ).The shopsite's return policy lasts for 14 days. This increases the frequency of the current and therefore the EMF induced in the secondary coil becomes enough to light up an LED. ![]() This is then fed to the primary coil which converts this energy into a constantly changing magnetic field. This is done by a high frequency power transistor ( BD139 ) which constantly switches, generating a high frequency switching current. The magnetic flux generated by the emitter coil gets linked to the secondary coil ( coil with LED ) due to this, EMF is induced in the coil.Īccording to the expression of induced EMF (rate of change of flux linked to the coil ), the EMF induced in the secondary is directly proportional to the rate at which the current changes ( or switches ).Īlso DC can't be directly induced using this method, this is because in DC, the current is constant throughout unlike AC current.Ĭommonly, the frequency of AC current that we get is 50-60 Hz which isn't enough to light up an LED using this process, so here comes the oscillator circuit which takes in power from a DC source and converts it into a high frequency switching current. This device basically works on the principle of mutual induction. Wires, solder, power source ( 6-12 V ). A bridge rectifier ( optional I've used 1n4148 diodes )ĩ. An LED ( red / orange / SMD red works best )ħ. This project is pretty easy to make and can be used to demonstrate and study the principle of electromagnetic induction practically. ( Instead use a power adapter or a battery ). *So use this device with great caution and DO NOT use it near any sensitive electronic device ( specially hard drives ) as it is capable of creating high frequency EMPs which could easily mess with your gadget ! While working with transformers take proper safety measures and use an insulated casing as there may be a potential threat of getting electrocuted. This version uses a more powerful high frequency switching transistor ( BD139 ) so that means now you've got great power and " with great power comes great responsibility " :D This instructable is inpired from : Wireless L E D by neelandan ! Thanks for this great instructable ! Yes ! That's right, this instructable will guide you to create your own wireless LED. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |