My Light Diagram

If you want to operate power LEDS with a truly constant current which significantly prolongs the lifetime of the lamp and avoid the power loss resulting from using a constant voltage supply with a series resistor, you need a suit-able constant current source. However, the only way to achieve really good efficiency is to use a switching regulator. Altogether, this means that you need a switching regulator designed to generate a constant current instead of a constant voltage. With this in mind, the author started working on the development of a LED pocket torch with especially high efficiency. Along with using high-capacity rechargeable batteries to maximise operating life, it’s worthwhile to be able to reduce the brightness, and therefore the operating current of the LEDs, when you don’t need full power. Accordingly, the author incorporated a dimming function in the design, based on operation in PWM mode in to reduce power losses to an absolute minimum. Power LED Driver Circuit Diagram...

This is a simple Project of 12 VDC Fluorescent Lamp Driver Circuit Diagram . A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it is. It uses a normal 120 to 6V step down transformer in reverse to step 12V to about 350V to drive a lamp without the need to warm the filaments. 12 VDC Fluorescent Lamp Driver Circuit Digram Notes Q1 must be installed on a heat sink. A 240V to 10V transformer will work better then the one in the parts list.  The problem is that they are hard to find.This circuit can give a nasty (but not too dangerous) shock. Be careful around the output leads. Parts Part Total Qty. Description Substitutions C1 1 100uf 25V Electrolytic Capacitor C2,C3 2 0.01uf 25V Ceramic Disc Capacitor C4 1 0.01uf 1KV Ceramic Disc Capacitor R1 1 1K 1/4W Resistor R2 1 2.7K 1/4W Resist...

This circuit detects the correct closed condition of the left and right side bags in a motorcycle companion. The bag has two locks that you must close for protection. Bicolor LED Driver Uses Two Leads Circuit Diagram: When you push the two momentary SPDT (single-pole/double-throw) switches, they sense the correct closed bag. One bicolor red-and-green LED indicates the bag’s status, with the red color showing the open-bag condition. To illuminate the LEDs, you must reverse the polarity of the applied voltage to the LED to change the color (Table 1). Diodes D 1 and D 2 and resistor R 1 form a discrete OR gate. When either pushbutton switch connects to 12V, the voltage at Point A is positive with respect to Point B. Transistor Q 1 conducts, letting current illuminate the red LED. When neither switch connects to 12V, neither diode conducts. The base of Q 1 pulls low through R 1 and R 4 , indicating that the bags are closed. Thus, the green LED illuminates as current passes through it a...

Circuit diagram: 100 watt LM391 Audio Power Driver   Datasheet for  LM391: Download

In many circuits, the switching action is performed by a relay, which in turn activates an external load. The power consumed by the relay may be unsuitable for battery-powered applications. Here is a simple solution using some inexpensive components to considerably save power. Circuit and working Fig. 1 shows circuit diagram of the power-saving relay driver where resistor R1 and transistor T1 form a standard relay driver circuit. Power-Saving Relay Driver Circuit Diagram Once the relay is energised, its pole is pulled in to make contact with the N/O side, and it holds in that position with typically 75 per cent of its nominal-rated voltage. Power consumed by a relay coil during this holding time equals V²/R, where R is resistance of the relay coil and V is the voltage. Here resistors R2 and R3, transistor T2 and capacitor C1 lower the power consumption after actuation by applying less than the normal operating power. Initially, when power is applied, capacitor C1 momentarily shorts res...

Here i am presenting you a 230V LED Driver circuit without transformer . Here i am using 5 led's you can increase the count at your convineance. Due to the absence of Transformers we can reduce the cost and size of the circuit considerably. As we all know LED's are Cheap, efficient and cool device with low power consumption. So we can reduce our electricity bills to a great extent. The circuit is powered by 230V 50Hz ac supply , so be careful while troubleshooting this project. Led's commonly works only in DC, so we have to convert the alternating current to direct current and step down to a safe value before applying to the led sequence. The circuit mainly consisting of 5 led bulbs, a bridge rectifier and a filtering network with voltage regulator. Read More.....

The UCC27518 and UCC27519 single-channel, high-speed, low-side gate driver device is capable of effectively driving MOSFET and IGBT power switches. Using a design that inherently minimizes shoot-through current, UCC27518 and UCC27519 are capable of sourcing and sinking high, peak-current pulses into capacitive loads offering rail-to-rail drive capability and extremely small propagation delay typically 17 ns. The UCC27518 and UCC27519 provide 4-A source, 4-A sink (symmetrical drive) peak-drive current capability at VDD = 12 V. The UCC27518 and UCC27519 are designed to operate over a wide VDD range of 4.5 V to 18 V and wide temperature range of -40°C to 140°C. Internal Under Voltage Lockout (UVLO) circuitry on VDD pin holds output low outside VDD operating range. Features Low-Cost, Gate-Driver Device Offering Superior Replacement of NPN and PNP Discrete Solutions Pin-to-Pin Compatible With TI’s TPS2828 and the TPS2829 4-A Peak Source and 4-A Peak Sink Symmetrical Drive Fast Propagati...

This tiny Unipolar stepper motor driver has been designed around SLA7078MPR IC from Sanken, It is unipolar stepper Motor driver can handle current up to 3 Amps, micro-stepping up to 1/16 steps. On-board Jumpers to set the Micro-stepping, Preset (Potentiometer) to set the current. The SLA7070MPR series motor driver ICs features unipolar drivers. The clock-in type input interface allows simplified control logic, and options for built-in sense current detection and load circuit short or open protection (patent pending) provide lower loss, and lower thermal resistance. The built-in excitation distribution circuit (sequencer) allows motor control using only the CLOCK signal for simple operations (rotate/stop), with motor speed control by frequency input into CLOCK pin. This eliminates logic signal lines required for conventional phase-input methods, and reduces demand on heavily-used CPUs. Unipolar stepper board is high efficient stepper driver for Unipolar stepper motor been design for var...

Making a DC motor driver with H-Bridge technique can use IC L293D as in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)"is. DC motor driver L293D can be used to control the DC motor 2 pieces at once. DC Motor Driver L293D can be used to control a DC motor continuously or with a PWM technique. Dc motor driver circuit in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)" only use IC L293D only. For more details see the following figure. Working system of DC motor driver L293D is to provide control signals in the form of logic or pulse to the input lines 1A - 1B for DC motor control M1 and the input 2A - 2B for the control of DC motor M2 with the following conditions: Input A Input B Motor DC 0 0 Motor silent 1 0 motor rotates counterclockwise 0 1 Motor berputer clockwise 1 1 Motor silent Description: Enable Input given a logic 1 to obtain such data in the table above.

This is a simple project of PIC Controlled Relay Driver circuit is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct electrical devices. The controlled device may be a heater, a lamp, a computer or a motor. To use this board in the industrial area, the supply part is designed more attentively. To minimize the effects of the ac line noises, a 1:1 line filter transformer is used. The transformer is a 220V to 12V, 50Hz and 3.6VA PCB type transformer. The model seen in the photo is HRDiemen E3814056. Since it is encapsulated, the transformer is isolated from the external effects. A 250V 400mA glass fuse is used to protect the circuit from damage due to excessive current. A high power device which is connected to the same line may form unwanted high amplitude signals while turning on and off. To bypass this signal effects, a variable resistor (varistor) which has a 20mm diameter is paralelly connected to the...

The LT3754 16 channel LED driver with a step-up DC DC controller designed by Linear Technology is capable of driving up to 45V of LEDs. Each channel of the LT3754 led driver contains an accurate current sink with ±2.8% current matching.If are used high current Leds channels can be paralleled. 16 Channel LED Driver Circuit Diagram     The LT3754 16 channel LED driver circuit allows a PWM dimming range up to 3000:1 and an analog dimming range up to 25:1. Operating frequency of the LT3574 16 channel LED driver can be programmed from 100kHz up to 1MHz using just a simple resistor or an external clock .