AC-DC & DC-DC Circuits
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This voltage-regulator/cuiTent-liimter combination can be made from two 7805 regulators as shown. Rl, R2, and R3 shouldbe selected for a 5-V drop at the maximum allowable currant limit. SI selects one of the three current values. Do not forget that Ul.... -
Using two 12-V filament or power transformers, an impromptu isolation transformer can be made for low-power (under 50 W) use in testing or servicing. SOI is an ordinary, duplex ac recept-able. .. -
By adding a flyback winding to a buck-regulator switching converter (see the figure), wliich is essentially a 5-V supply with a 200-mA output capability, a 12-V output ) can be produced. The flyback winding on the main inductor (forming transformer Tl).... -
The UPS is basically an ac inverter that is powered by a 12-V, lead-acid automobile battery. During power outages, it can supply several minutes of power for an average personal computer. It incorporates a crystal-controlled 60 Hz time base, so that a.... -
This circuit protects microprocessor systems from "brownouts" without the expense of an uninterruptible power supply. Designed around a small 9-V nickel cadmium battery the circuit continues to provide a constant 5-V output during brownouts of up to a few.... -
A dual-voltage circuitry both strikes and maintains the arc. The lamps require a starting voltage in excess of 1,000 volts. Once stabilized, the voltage drop across the lamp is near 20 volts. Power supply consists of two main sections. The first section, the.... -
Those of you who frequently use devices that work on battery or you need a negative trend at the moment you have a single positive, will definitely look for a converter like the one described below. Constructing it, you can convert a positive voltage of a.... -
The circuit provides for accurate half-wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is -1. By reversing both diodes, the polarity can be inverted. This circuit provides an accurate output, but.... -
When the lines SDA (Serial DAta) and SDA 'are logical '1', the circuit is at rest with the result that optocouplers IC 1 and IC2 can not convey absolutely no information. But once the SDA line become the 'O', then the LED the IC 1 becomes conductive through.... -
It uses three-terminal adjustable voltage regulator power supply functions and suspension Electric thyristor presetting the LM317.. -
This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has.... -
For the input and output voltage without isolation but only with a working switch and L, D, C composed of an inverter circuit, its most basic form,.. -
MAX8743 chip using laptop chipset power supply circuit It is shown using the MAX8743 chip laptop chipset power supply circuit, the 5v power supply, respectively, after the conversion output +2.5 V and +1.8 V power supply... -
Output 12V-10A power circuit +12 V is the use of high-current switching power supply circuit consisting of L296, the output current up to 10 A. The entire circuit is small, seldom-used components... -
It consists of two LM339 comparator and two CD4070 XOR gate thyristors and other components autotransformer exchange regulator, the circuit also has overvoltage and undervoltage protection. Adjust the potentiometer RPi or change the P position, the control.... -
Multi-output power supply circuit (MAX1902) It shows the notebook computer motherboard power supply circuit which uses MAX1902 chip for power control circuit, which can be all the way in order.. -
Shown for the multi-output power supply circuit. The circuit uses the transformer secondary winding and 4 respectively 7812,7805,7905,7912 + 12V, + 5V, -5V and -l2V 4 groups independent output voltages. Each group has a separate output voltage switching.... -
As shown in FIG circuit, T is auto voltage regulator. Its output fixed input end by a servo motor to automatically adjust the output remains constant.Transistor VTl, VT2: 3DK9C, = 65 ~ 85; VT3: 3AX818, = 60 ~ 80; diode VD2, VD3, VD6 ~ VD9: 1N4002; VD4,.. -
300A-18V three-phase thyristor power regulator circuit electrolysis It can output DC 3000A, 18V (adjustable), power supply solution processing. Circuit from the main circuit, trigger circuit, part of the synchronous power, DC power, voltage negative feedback.. -
As shown for the single-phase bridge rectifier arms rectifier circuit. The circuit consists of arms cathode (negative electrode) and arms parallel anode (positive electrode) in.. -
As shown in FIG inverted to adopt IC1MAX868 and CMPSH-3S consisting of four times the pressure of DC/DC converter power supply. IC1MAX868 which is a type inverting charge pump .. -
As shown in FIG multimeter AC/DC converter circuit automatically. Ordinary digital multimeter by manual operation to complete AC and DC measurement conversions. New DT860D digi.. -
Bridge rectifier circuit in the electronic ballast application circuit .. -
This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily.... -
Amateur Radio Transmitters using valves such as 807 or1625 works well with a plate voltage between 600V to 700 Volts.The circuit described here is a full wave voltage doubler. The output voltage is twice the input voltage. For 230V AC input the output will.... -
This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage... -
The 15v zener is fed via the 4K7 resistor from the input. With 0.6v across the base - emitter of the PNP transistor, this establishes a voltage of 14.4 across the 3K3, so there must be a current of nearly 4.4mA through the 3K3. This current is available to.... -
R2 = (192 x Vout) - 240, where R2 in ohms, Vout is in volts and must be at between 1.2 V and 35 V. Vin should be at least 2.5V greater than Vout. Select a wall adapter with a voltage at least 2.5 V greater than your regulated output at full load. Maximum.... -
This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few.... -
This circuit can be adapted for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply use two 12 Volt batteries in series and a 7815 regulator. There is a lot of flexibility in this circuit... -
This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA..... -
In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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