Free homemade LED lamp circuit diagram

Posted on Mar 28, 2007

Also known as the Free lamp (ie, online sellers, commonly known as Myanmar lamp), because it takes into ordinary household fixed telephone line voltage power to do, no batterie

Click here to download the full size of the above Circuit.

s or AC power, the tail crystal head into a telephone extension interface can be illuminated without the other pay the electricity bills, do not worry about power outages. Also can serve as phone calls flashing lights. Listening is not timely to remind the good old people answer the phone, because after phone off hook LED light will turn off, but also help you discover whether others Daoda phone also has some anti-lightning protection. However, because the product is used in the telecommunications room phone belongs to feed power supply, once obtained from the use of too much current will inevitably affect the phone calls and send and receive faxes, especially likely to cause frequent dropped calls when ADSL broadband dial-up Internet users. Figure 3 is a telephone line LED lamp circuit schematics, telephone line DC voltage 36V or 48V via 10k limiting resistor by four diode (or rectifier bridge) as polar transform applied to the LED, when the telephone feed voltage to 36V, the measured operating current of about 1.2mA, the brightness is low, the current limiting resistor into 5.6k current work promoted 2.1mA: brightness slightly increase.

Leave Comment

characters left:

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Wideband radiation monitor

A sensitive radiation monitor may be simply constructed with a large-area photodiode and a quad...

Ear Protector Circuit

The ear protector is actually a peak audio-detector/shutdown circuit that disables the amplifier...

Digital AC Voltmeter

It started out as a simple unenclosed variac (variable autotransformer) and electrical outlet...

Solar Battery Charger Circuit

This is the most simple and affordable solar battery charger that the hobbyist can make. It has a...

A decorative quartz voice packet clock circuit

BGl, BG2 composition directly coupled amplifier, BG, BG4 is composed of monostable trigger...

Stepless triac dimmer with a steady light function

Circle S2 is stable automatic light switch, when S2 is open, the entire circuit is Subsection II...

Current leakage protection circuit

Current leakage protection is currently the most used and best leakage protection device. Current...