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Ever needed a low power 120volt AC  power source for your car, van or truck? Well this circuit should do the trick for you. It will supply 15 watts of AC power to a device. It should power lamps, shavers, small stereos and small appliances. If you draw to much power the circuit will shut down all by itself. 12 Volt DC to 120 Volt AC Inverter Circuit Diagram The output of this circuit is a square wave so there may be some noticeable hum on audio units plugged into it. To reduce some of the hum increase the value of the output capacitor which is at .47uf now. That transistor in the circuit are high power PNP transistors. Radio Shack part number 276-2025 are good ones to use or TIP32. The transformer is a 24 volt 2 amp center tapped secondary Radio Shack part number 273-1512 or equivalent.

There are many approaches to the problem of activating a light when it becomes dark, and a recent Design Idea covers this topic (Reference 1). Some approaches require a dc power supply and an electromechanical relay, but a better approach involves feeding the device directly from the ac line, minimizing the number of components  ( Figure 1 ). Figure 1. The photoresistor activates the TRIAC and the load when darkness falls. The heart of the device is a light-sensitive cadmium-sulphide resistor, PR, with a resistance of approximately 200 kΩ in the dark and decreasing to a few kilohms in the light. PR and capacitor C1 form an ac-voltage divider. In daylight, the voltage across PR is too low to generate the required gate-trigger current to turn on bidirectional ac switch Q1, thus keeping the load – usually a lamp – off. When it becomes dark, PR’s resistance rises, resulting in an increase in the TRIAC’s gate current that triggers the TRIAC and lights the lamp. The circuit uses inexpens...

This is very simple circuit diagram of  Half wave AC Phase Controlled Circuit.  The 5AH will trigger when the voltage across the two 0 juF capacitors reaches the breakdown voltage of the lamp. Half wave AC Phase Controlled Circuit Diagram: Control can be obtained full off to 95% of the half wave RMS output voltage Full power can be obtained with the addition of the switch across the SCR.

This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs to be detected. D3 illuminates when the line voltage is approaching 120V and will remain in the on state also at 240V supply. On the other hand, D6 will illuminate only when the line voltage is about 240V and will stay on because the latching action of Q1, Q2 and related components. C1, D1 and D2 provide a low dc voltage in the 4.5V - 6V range in order to allow proper operation of latch circuit and LEDs.  110 and 220V AC LED Voltage Indicator Circuit diagram     Parts: R1_____________470R 1/2W Resistor R2_____________220K 1/4W Resistor R3,R7__________470R 1/4W Resistors R4_______________1K 1/4W Resistor R5_______________2K2 1/4W Resistor R6_____________330R 1/4W Resistor C1_____________330nF 630V Polyester Capacitor C2_...

Description                A lot of students are who don't know how to convert 230 volt AC to 400 DC. So today i am published  ' 230 V AC to 400 V DC circuit diagram ' on my blog. Working principle of this circuit diagram is very simple. You already knew the working principle of a bridge rectifier. This circuit is same as bridge rectifier and the working principle is also same. The fuse is used to protect the circuit, if the current is greater than 1 A. Parts List Component No: Value F1 1 A B1 IN4007  C1 470MF/450V  V1 230 V AC  Source

for the Holiday Home Electrical appliances accidentally left on  in (holiday) homes left unoccupied for a  short or a long period consume power  unnecessarily and can present a fire hazard. Everyone will be familiar with those  nagging thoughts, a few miles down the  road from the house: “Did I remember  to switch off the coffee machine? The  lights? The oven?” Circuit diagram : Automatic AC Power Switch Circuit Diagram Hotel rooms are often equipped with a  switch near the main door which enables the power supply to everything in  the room only when the plastic card (which  might contain a chip or have a magnetic strip  or a pattern of holes) that serves as the room  key is inserted. The circuit idea given here  to switch off lights and other appliances is  along the same lines. The solution is surprisingly simple. A reed contact is fitted to the frame of the main entrance door, and a matching magnet  is attached to the door itself such that when  the door is closed the reed con...

Description                A lot of students are who don't know how to convert 230 volt AC to 400 DC. So today I am published  ' 230 V AC to 400 V DC circuit diagram ' on my blog. Working principle of this circuit diagram is very simple. You already knew the working principle of a bridge rectifier. This circuit is same as bridge rectifier and the working principle is also same. The fuse is used to protect the circuit, if the current is greater than 1 A. Parts List Component No: Value F1 1 A B1 IN4007  C1 470MF/450V  V1 230 V AC  Source by : link