In the following post I have explained the main technical features and specifications of 3 watt white LEDs. I have explained more regarding their operating parameters and safe-operating limitations. Main Features Extreme luminosity capability Extreme working life > 50K hours. Very Low thermal resistance. SMD technology allows embedded PCB type sodering. Completely UV free design Enhanced ESD protections Image Courtesy – https://www.led-display.cc/High-Power-LED/Q1B/LP5W-80-SERIES:-5-watt-high-power-LED.jpg […]
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Surge Protected Cheap Transformerless Hi-Watt LED Driver Circuit
The increased number of complaints from the readers regarding burning LEDs associated with my earlier posted transformerless 1 watt LED driver circuit, compelled me to solve the issue once for all. The power supply section of the circuit discussed here remains exactly identical to the previous configuration, except the inclusion of the “switch ON delay […]
Simple PIR LED Lamp Circuit
The following PIR LED lamp circuit was designed by me for one of the followers of this blog Mr.Deepak upon his request. The circuit is a LED driver which responds to ambient light as well as to the presence of a human, person or intruder, and varies its illumination accordingly, let’s know more. Technical Specifications “I was looking to […]
220V Operated LED Flasher Circuit using Triac
The following triac/diac based mains operated LED flasher circuit which is actually an astable multivibrator circuit utilizes only a diac and resistor arrangement for implementing interesting wig wag flashing of two LEDs. The simple 220V flasher circuit was shared with me by Mr.Vineesh, who is one of the keen followers of this blog. I would […]
SMD LED based Emergency Lamp Circuit
An emergency lamp using SMD LEDs is able to generate illuminations with extreme brightness due to the high efficiency of the SMD type LEDs. Moreover, SMD LEDs also ensure the unit will be very compact and lightweight. The following post explains a simple circuit diagram of an automatic emergency lamp using 36 nos. SMD LEDs. The circuit […]
How to Make LED/LDR Opto Coupler
Ever needed an application where the resistance of a resistor needed to vary proportionately in response to a PWM or a varying analog voltage? Yes, this is where an LED-LDR opto-coupler becomes so useful. The following image shows the symbol for a LED LDR opto-coupler. Any other regular opto-coupler, such as an LED/transistor, LED/FET, or […]