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....