Matt circuit

This circuit uses low-voltage AC to drive a string of 50 or so bi-color LEDs (two LEDs connected in inverse parallel). Power to the LEDs is controlled by the Triac and the two optocouplers which have their photo-transistors effectively connected in inverse-parallel. Depending on which optocoupler is turned on, the Triac applies positive, negative or both half-cycles to the LEDs and so the colours can be red, green or in-between. Switch S1 is used to select the pulses from two oscillators which are formed by the NAND gates in IC1 (4011B). This provides a variety of LED flash patterns, depending on the setting of S1. Circuit diagram: Author: Matthew Peterson - Copyright: Silicon Chip Electronics

The circuit 1Watt LED for AC LED uses a 1 Watt Luxeon LED white, its voltage is 3.6 volts and consumes 350 mA at maximum. It is important to note that this circuit can generate a lethal shock if handled carelessly. Most of the points are on the network, so that care should be taken when handling. 1 Watt LED em AC Circuit Diagram

Circuit Inverter 500 Watt 12VDC to 220VAC is made using a transistor. The basiccally of the circuit Inverter 12VDC to 220VAC 500 Watt This is a configuration of 2 pieces of transistors Q1 and Q2 which form a series of Flip-Flop. The output of the flip-flop Q1 and Q2 in the circuit Inverter 12VDC to 220VAC 500 Watt is then broken down for each pulse to complement each other using a series compiled by Q3 and Q4. Output which complement each other is then given to the driver transistors Q5 and Q6 form the transistor 2SC1061. Series Inverter Power Inverter from 12VDC to 220VAC 500 Watt This is a series of parallel transistors Q7 and Q8 are prepared and Q7x and Q8x the form of power with a type 2N3055 transistor 10 pieces. drawing a complete range of circuit Inverter 12VDC to 220VAC 500 Watts can be seen as follows. Step up part of the Circuit Inverter 12VDC to 220VAC 500 Watt 12V CT uses 12V transformer in the secondary and primary 0 - 220V. Working frequency of the Circuit Inverter 12VDC ...

AC switches are silicon devices that control AC loads directly connected to the AC mains. This means that the driving reference terminal of the AC switch can be connected to the Line potential. This circuit explains the need of an insulation layer for the control unit and the way to implement it for an AC switch device.  It was thought in the past that connecting an MCU to the Line should be avoided as it will lead to poor appliance immunity. But it has been demonstrated over the years that such topology provides good immunity. Connecting an MCU supply to a stable non-floating reference is even better for immunity. Safety insulation should be provided between accessible parts and high-voltage circuits to protect end users against electric shocks. It’s not required to ensure safety insulation by insulating low-voltage control circuits (like MCU) from high-voltage parts (like AC switches). In fact, the insulation could be implemented elsewhere—for example, on the keyboard to which the e...

AC Mains Bistable Switch Circuit Diagram. This AC mains-operated bistable  switch turns on or turns off a  device using a miniature neon  lamp and a few discrete components.  This switch can be used for control pan-els, appliances and lighting controls.  A push-to-on switch is used to  light up the neon lamp. The light emit-ted by the neon lamp, in turn, enables  the switching action of the circuit. Use  of a 555 timer wired for bistable operation makes the circuit act as a bistable  switch. . AC Mains Bistable Switch Circuit Diagram AC Mains Bistable Switch Circuit Diagram   The neon lamp (NL1) and the  push-to-on switch (S1) are directly connected to 230V AC mains. The 12V DC  supply for timer 555 (IC1) is derived  from 230V AC mains through capacitive dropper C1, resistor R1 and a 12V  zener diode. IC1 works as a flip-flop  circuit, with the signal at its output  pin 3 toggling every time it receives a...

Basic / beginners Electronics Tutorial / course / lesson - Voltage, Current, Power, AC and DC --------------------- Click "Show more" ------------------------------- My website and forum:-  http://www.mjlorton.com Donations and contributions:-  http://www.mjlorton.com My techie channel MJLorton - Solar Power and Electronic Measurement Equipment - http://www.youtube.com/MJLorton My Techie Amazon Store:  http://astore.amazon.com/m0711-20 My other channel VBlogMag - For almost any topic under the sun! -  http://www.youtube.com/VBlogMag My VBlogMag Amazon Store:  http://astore.amazon.com/vblogmag-20 ---------------------------------------- ­------------------------------- Nikola Tesla -  http://en.wikipedia.org/wiki/Nikola_T... Thomas Edison -  http://en.wikipedia.org/wiki/Thomas_E... In this tutorial I cover the following: * Some history about electricity / central power stations / electrification.  * Science of electron flow in a conductor / wire * ...

Description  The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current. Since the capacitor must pass current in both directions, a small diode is connected in parallel with the LED to provide a path for the negative half cycle and also to limit the reverse voltage across the LED. A second LED with the polarity reversed may be subsituted for the diode, or a tri-color LED could be used which would appear orange with alternating current. The circuit is fairly efficient and draws only about a half watt from the line. The resistor value (1K / half watt) was chosen to limit the worst case inrush current to about 150 mA which will drop to less than 30 mA in a millisecond as the capacitor charges. This appears to be a safe value, I have switched the circuit on and off many times without damage to the LED. The 0.47 uF capacitor has a reactance of 5600 ohms at 60 cycles so the LED cu...

The circuit described here is derived from a conventional design for a simple lamp dimmer, as you can see if you imagine a diac connected between points A and B. The difference between this circuit and a normal diac circuit is that a diac circuit won’t work at 12 V. This is the fault of the diac. Most diacs have a trigger voltage in the range of 30 to 40V, so they can’t work at 12 V, which means the dimmer also can’t work. 12 V AC Dimmer Circuit diagram : 12-V AC Dimmer Circuit Diagram The portion of the circuit between points A and B acts like a diac with a trigger voltage of approximately 5.5 V. The network formed by R1, P1 and C1 generates a phase shift relative to the supply voltage. The ‘diac equivalent’ circuit outputs a phase-shifted trigger pulse to the triac on each positive and negative half-cycle of the sinusoidal AC voltage. This works as follows. First consider the positive half of the sine wave. C1 charges when the voltage starts to rise, with a time constant determined ...