Single-ended primary inductance converter (SEPIC) topology is a good choice for automotive power systems that require an output voltage between the low and high values of the input voltage. SEPIC topology fits this application because its duty ratio can be....

The consumer unit (or electricity meter`) cupboard in some older houses is a badly lit place. If the bell transformer is also located in this cupboard, it may be used to provide emergency lighting by two high-current LEDs. These diodes are powered via a....

The diagram shows the output sampling winding isolated switching power supply. In diagram, T is high frequency transformer; N2 is self-oscillation positive feedback winding; N3 is the error amplifier, and VTSis thewinding to provide sampling signal; N4,....

AC power is supplied via AC Fuse F1 and Power On/Off switch S1 to 6. 3V filament transformer T1. Fuse F2 is provided as an additional safety feature, since a short to the filament transformer may not be enough to blow the main power fuse. Hum balance pot R1....

Gyrators find application in DC holding circuits which are used in most DAAs (Data Access Arrangements). DAAs typically use dry transformers which can not tolerate DC current, and incorporate a DC blocking cap. When the telephone goes off hook, it must pass....

The liquid level controller circuit consists of the power supply circuit and level detection control circuit, and it is shown as the chart. Power supply circuit consists of the power switch S1, power transformer T, bridge rectifiers UR1, UR2 and filter....

The following circuit shows about Three Phase Auto Changer Circuit Diagram. This circuit using the 2N2222 Transistor. Features: transformer with ....

One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....

As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....

Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....

This is a low cost circuit diagram for the emergency light based on white LED.  Component: LM317 IC, Resistor, Transformer, LED, Variable ....

A Norcold DE560 that was working fine until I turned it on this year. It`s in a boat and when I turne the refrig breaker on it, it pops immediately. is there a fuse or something on the fridge I can check Ok the only thing that will cause the circuit breaker....

Here is a simple circuit diagram I think will work for the charger. I already have the transformer, two SCRs, maybe the capacitor, heat sink, and a case to mount it all in. If you go for lead- acid batteries and forget the SCR`s, or put them in a circuits....

An increasing number of appliances draw a very small current from the power supply. If you need to design a mains powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance`s total power....

The power supply is pretty mundane. The 110VAC comes in on connector N17 and is hooked in series with a power switch SW1, a fuse F1, and the primary coil of transformer T1. The secondary coil of T1 produces 24VAC at 12 Amps and is routed through the full....

The PCD3360 is a CMOS integrated circuit, designed to replace the electro-mechanical bell in telephone sets. It meets most postal requirements, with selectivity of output Tone sequences and input ringer frequencies. Output signals for a loudspeaker or for a....

The schematic diagram below shows a simple trivial low-cost 12 volt DC 50W off-line SMPS switching power supply circuit. It can be used for DIY home projects or to learn operation of flyback converters. This PSU can work over a universal input AC line range....

The chart shows the Christmas lights circuit which uses simple, inexpensive CD4069 CMOS hex inverter to control four circuits with 200 light-emitting diodes (each circuit has 50 LEDs), and it is directly supplied by the 220V power source without power....

Rectifted and filtered voltage from the 24 Vac transformer is applied to the LM723 voltage regulator and the npn pass transistor set up for constant current supply. The 470 ohm resistor limits trickle current until the momentary pushbutton (S2) is depressed,....

The power supply has been simplified- Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....

This circuit is converter to use to charge DC12V from the lead-acid batteries to AC 250V for use in a car, Boats or mobile homes. There are the output power There are the sufficient power to the small electronics such as a lamp or electrical soldering iron.....

This voltage regulator circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find. The transformer....

The TS2418 is a monolithic integrated circuit telephone Tone ringer with bridge Diode when coupled with an appropriate transducer, it replaces the electromechanical bell. This device is designed for use with either a piezo transducer or an inexpensive....

This is another 100watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC-  up to 100w from 2-3A transformer....

Micropower and low-voltage op amps allow you to build high-performance analog-signal processors that require no batteries or wall transformers. Instead, you can use a capacitor as a power source. The circuit in Figure 1 shows an analog mixer designed for....

There are also other methods of coupling signals from one stage to another. Transformer coupling is the most common method used to couple rf amplifiers. Transformer coupling has many advantages over RC coupling for rf amplifiers; for example, transformer....

This is a circuit that used to main pulse. The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes. This is useful, for instance, when a mains-operated equipment is to be tested for long....

220V bulb where one end of the relay is connected to the 220V dc and the other end to ground; and is switched one to the other using the output of a PWM as shown in the block diagram below: However, I am afraid that this is a poor design and not safe: no....

This regulator circuit stabilize the output voltage at 200V directly (without a transformer). Although the output voltage is high, this circuit only suffer a...

Circuit » Home » 7809 » 7812 » 7909 » 7912 » Dual Voltage » Hobby Electronics » Hobby electronics projects » RC filters » REGULATOR » transformer » Dual Voltage Power Supply 12 Volt This is the simple circuit diagram of Dual Voltage Power Supply. It is used....

An increasing number of appliances draw a very small current from the power supply. If you need to design a mains powered device, you could generally choo....

To lower or raise any specific voltage is better adapted from a transformer, but this component does not operate in direct current, which is available in battery or vehicle. Therefore we must put an oscillator that generates an alternative current. The....