AC-DC & DC-DC Circuits
- Page 22-
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply..... -
I`m building a tube/MOSFET hybrid power amplifier based on a circuit in AudioXpress by Cozza (5/01) which in turn is based on a design by Borbely.... -
The Cockroft-Walton multiplier uses a cascaded series of diodes and capacitors to generate a high voltageDC potential from anAC input through acircuit topology thatuses diodes to charge capacitors in parallel and discharge them in series. The output polarity.... -
Transformers made for powering large neon signs are inexpensive and very reliable. Most commonly, the secondary is center-tapped, which prevents the use of its full peak-to-peak output in applications where one of the terminals needs to be grounded. In the.... -
If you`re just building a dual stand-alone preamplifier (as for, say, a stereo magnetic phono preamp), your power supply requirements will of course be greatly reduced. Figure 5A shows a simple supply using readily-available 12 volt, 1/2 ampere transformers.... -
Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply.... -
By combining switching and series-pass techniques, this high-voltage supply`s designer achieved 0.01% regulation at power levels to 100W.... -
Many systems require that the primary source of DC power be converted to other voltages. Battery driven circuitry is an obvious candidate.... -
The following is Chapter 4, part five of a five part series ""Some thoughts on DC/DC converters"" by the late Jim Williams and Brian Huffman from Linear Technology`s Volume II book entitled, ""Analog Circuit Design-- Immersion in the Black Art of analog.... -
C1=1000 Micro Farad aluminum electrolytic capacitor (For loads less than 100mA you can sustitute with 220 microfards capacitor), Voltage rating = 2. 5 times of Output Voltage. C1 = 1000 Micro Farad aluminum electrolytic capacitor(For loads less than 100mA.... -
Here is a collection of (SMPS) schematic, datasheets, images and tips for switch mode power supplies using TL494/ LM339, KA7500 and IC2003.... -
Advantages and disadvantages of different power supply technologies as well as the design considerations involved in choosing and evaluating a mains transformer. The pros and cons of external supplies, inrush current control, RF emissions from bridge.... -
The circuit diagram was designed to create a power supply without utilizing any transformer circuit. This circuit illustrates the advantages as well as th.... -
The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Supply), which shows how the batteries take control during an outage in elec.... -
The easy way to power your projects Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, a.... -
48 V ‘phantom powering has become the standard for professional condenser microphones. The supply (or rather bias) voltage is applied over both wires of.... -
A radio camera on a model railway should transmit constantly while the train is moving and continue transmitting for a few minutes after the train stops .. -
This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7. 2V battery. Such batteries can now be very difficult or expensive to obtain for earlier model camcorders. In essence, the circuit is a standard LM317 adjustable.... -
A simple 9 Volt 2 amp supply using a single IC regulator. There is little to be said about this circuit. All the work is done by the regulator. The 7809 c.... -
Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce.... -
The circuit was designed to provide an adjustment with a power supply that is symmetrically designed while providing a voltage range of 1.25V to 30V at 1A.... -
Readers who do not care to modify the power supply of an old PC into a suitable halogen power source (see our April 2006 issue), may find the present desi.... -
Sometimes it is desired to power a circuit from a battery where the required supply voltage lies within the discharge curve of the battery. If the battery.... -
This circuit arose from the need of the author to provide a 5 V output from the 24 V battery of a solar powered generator. Although solar power is essenti.... -
More and more equipment is sold that runs off internal rechargeable batteries. Although a matching charger is usually supplied in the package, there are a.... -
The TPS6420x controller is designed to operate from one to three series-connected cells or from a 3.3 V or 5 V supply obtained from a USB port. At its out.... -
National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is norm.... -
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.... -
This circuit will supply up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn t generate very much heat.The circ.... -
Inexpensive miniature transformers normally provide one or two secondary voltages, which is sufficient for generating a set of positive and negative suppl....
New Circuits
-
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.....
Popular Circuits
Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using...
This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is...
If you haven`t already read my CT-100 restoration article, I suggest that you start there. It...
You "see" colors, geometry, distance, spatial continuity and discontinuity, motion, connectedness...
Well this is a Very Accurate LC Meter based on PIC 16F628A. Having inspired from surprisingly...
The 74L121 and 74L122 ICs pin out diagram works any any style 74xx121 or 74xx122 DIP chip, but...
The disk magnets are in attraction on each end of the power coil. The coil is pulse charged,...
All electronic systems and equipment regardless of their size or function have one thing in...
Europe's leading SGS-THOMSON STMicroelectronics recently introduced a tone quite new to the...
A sensor SEN1 output DC voltage varies linearly according to the relative humidity. This DC...