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Battery Backup Regulator is Glitch-Free & Low Dropout - DN170
Design Notes (Linear Technology) (app note added 2/06) |
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Beef up Voltage Regulators - Last month we learned how to make any
fixed voltage regulator adjustable. However, many fixed regulators such as
the 7805 limit their output current to 1.5 amps. While this may be adequate
for many QRP transceivers, amateurs would often like to run a low power
mobile 2 meter transceiver on their home-brew power supply. All that needs
to be done is to add a couple of inexpensive pass transistors as in Figure
1.... [Radio Amateur Society of Norwich] |
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Bench Top Power Supply Auto-Fan - The op-amp used is a readily
available LM339. This IC contains four op-amps but we use only two of
them. Use the others for spare or do something else with it. For the
thermistor I used a small, very expensive ($52), glass-encapsulated type
because I had it laying around but almost any type will do. I experimented
with a couple different types and they all worked.…. [Tony van Roon's
circuit] |
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Bench Top Power Supply Part 1 - This 30 volt Bench Top Power Supply is rated
at 10 amp, and it is so versatile and powerful that it will slowly turn your regular
115VAC power drill. It was designed to work under the most extreme circumstances and
short-circuit protected (within specs), even in the 10-Amp setting. Cooling (optional)
fan(s) keep the semiconductors and the large cooling rib cool automatically…. [Tony
van Roon's circuit] |
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Bench Top Power Supply Part 2 - In this second part of the Bench Top Power
Supply project we will cover the construction, assembly, and wiring of the large
coolrib and the optional Automatic Fan Control circuit. When that is done the
transformer T1, 115VAC components, large capacitor C3, and the bridge rectifier will
be installed and wired up. There are lots of pictures and photos to help you out. Main
thing to remember is to TAKE-IT-EASY, read the explanations and take your time.
This is definitely a NO rush job.…. [Tony van Roon's circuit] |
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Bench Top Power Supply Part 3 - Almost done! In this part three we install
the final parts, make the last connections, and do the final adjustments with the
trimmer pots. Take your time (go-slow) with the trimmer pots for adjusting current! ….
[Tony van Roon's circuit] |
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Bench Top Power Supply Part 4 - I have been asked several times to include
more construction pictures and photos. Well here they are. A couple of them can be
magnified to full size; just click on them. I will add photos of the shunts for the
panel meters and associated calculations on a later date. In the mean time this will
get you going for a while.…. [Tony van Roon's circuit] |
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Big Power for Big Processors: The LTC1430 Synchronous Regulator - DN113
Design Notes (Linear Technology) (app note added 1/06) |
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Bleeper Box for time reference - (circuit / schematic added 6/05)
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Boost Reference Design - This design uses UCC38C43 as a boost power
supply controller. It operates from a 12 volt input and generates a 24 volts (or
higher) output voltage. The input voltage can be widely varying as UCC38C43 can
sustain a 20 volt maximum input. (added 3/05) |
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Boosting Regulator Current - An outboard pass transistor used to increase
the current output of a voltage regulator IC…. [dircuit design by Andy Collison] |
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Bootstrapped boost converter operates at 18V - 04/23/98 EDN-Design
Ideas....Many circuits, such as those that use batteries or solar cells, must operate
in the face of decreasing supply voltages. The circuit in Figure 1 maintains the
maximum load current as the supply voltage drops. The regulator boosts a 2.5 to 4.2V
input to 5V....File contains many circuits, scroll to this one.... [Design Idea by Tom
Gross, Linear Technology, Milpitas, CA] |
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Buck Mode Switching Regulator for Solar Applications - The purpose of a
voltage regulator circuit is to take a variable input voltage and produce a steady
output voltage. Two common regulator types are linear and switch-mode. Linear
regulators are simple, but waste a lot of power in the process of regulating the
voltage. Linear regulators can be thought of as self adjusting series resistors.
Switch-mode regulators such as this one are much more efficient. Switch-mode
regulators convert DC input voltages to pulses of high voltage DC. The DC pulses are
used to charge a storage capacitor to the desired output voltage. The voltage is
regulated by varying the width of the DC pulse.... [G. Forrest Cook] |
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Buck regulator and two inductors make dual polarity converter - 20-Mar-03
Issue of EDN A common problem for power-supply designers is to create a compact,
dual-polarity step-down converter. If space and cost are not concerns, the obvious
solution is a pair of dc/dc converters, one for each output. But space and cost are
almost always issues for communications, data-acquisition, and disk-drive
applications.... [Design Idea by Keith Szolusha, Linear Technology Corp, Milpitas, CA] |
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Buck regulator controls white LED with optical feedback - 10/25/07
Video Design Ideas-EDN By using optical feedback, you can stabilize the output
level of a high-intensity LED. (electronic Design Idea added 9/08] EDN is
migrating links. This link is not verified. Google the "title" + EDN for new
link. |
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Buck regulator forms high power, inverting –5V supply - 1-Apr-04 Issue of
EDN Configuring a step-down switching-converter IC as an inverter yields an
efficient, high-power, -5V supply that can of deliver currents as high as 4.5A at the
12V input or 3.2A at the 5V input (Figure 1). Conventional inverting power supplies do
their switching using a p-channel MOSFET (Figure 2]. That configuration works well at
lower currents, but has limited use above approximately 2A, depend.... [Design Idea by
Bruce Denmark, Maxim Integrated Products, Sunnyvale, CA] |
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Build your own laboratory precision voltage reference - 05/24/07 Video
Design Ideas-EDN Mark Thoren, mixed-signal application engineering manager
with Linear Technology, demonstrates an amplifier-based Circuit design for a
relatively inexpensive precision voltage source….. |
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Capacitance Multiplier Power Supply for Class-A Amplifiers - Extremely low
ripple supply with less power dissipation than a regulator (electronic schematic /
circuit added 4/02) |
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Car Battery Charger - quickly and easily charge most any lead acid battery,
automatically turns charging off when ready…. [Design by Aaron Cake] |
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Car Converter for 12 Volt to 9V - To get a more precise output voltage,
replace zener diode Z1 with 10V and R1 with a 1Kilo ohm potentiometer. A Coolrib for
Q1 is optional but highly recommended. You can replace Q1 for a more robust type to
get more output amps depending on your requirements. Simple circuit to power your 9
volt cassette recorder and other stuff.... [Tony van Roon's circuit] |
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Car NiCd Charger - This circuit provides up to20-Volt output from a
regular13.2V automotive battery, to enable constant current charging of NiCd battery
packs up to15 cells @1.2V (Tony van Roon's 18V total)…. [Tony van Roon's circuit] |
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Ceramic output capacitors enhance internally compensated switchers -
20-Jul-06 Issue of EDN Restore switching regulator stability when you change
output-capacitor compositions.... [Design Idea by Robert Kollman, Texas Instruments,
Dallas, TX; Edited by Brad Thompson and Fran Granville] |
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Change Improves Regulators’ Reliability - 05/12/94 EDN-Design Ideas....The
standard circuit for adjustable, 3-terminal regulators (LM317, LM350, etc]in Fig 1a
suffers from a designed-in fault If potentiometer R2’s wiper loses
contact, regulator’s output goes high. Because potentiometer is most
unreliable part in circuit, consider using circuit in Fig 1b. Now,....
[Design Idea by Peter Demchenko, VN, Vilnius, Lithuania] |
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Cheap Pushbutton replaces Rotary Switch - 26-Oct-00 Issue of EDN-Design
Ideas....The problem of setting any one of four modes of aµC-operated process has a
straightforward solution Have theµC check the states of some 4 bits of aµC.…
[Design Idea by Abel Raynus, Armatron International Inc, Melrose, MA] |
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Circuit improves on bias for GaAs FETs - 6-Dec-01 Issue of EDN It's
important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC
(monolithic-microwave-IC] amplifier. These devices are extremely sensitive to drain
and gate voltage levels as well as to the order in which these biases turn on and off.
A GaAs-FET amplifier that uses two bias voltages-a negative supply, VGG, on its gate
and a positive supply, VDD, on its dra.... [Design Idea by Tom Roberts, Anritsu Co,
Morgan Hill, CA] |
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Circuit provides ADSL frequency reference - 05/25/00 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Circuit provides leading-edge blanking - 29-May-03 Issue of EDN In
isolated switch-mode power supplies using peak-current-mode control, generally the
current-sense resistor senses the current on the primary side of the power converter.
Figure 1 shows a typical circuit, in which R2 is the current-sense resistor that
monitors the current. The current-sense signal goes to the input of the PWM
comparator—in this case, the PWM comparator's input (ISENS.... [Design Idea by Michael
O'Loughlin, Texas Instruments, Dallas, TX] |
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Circuit provides reference for multiple ADCs - 24-Jan-02 Issue of EDN
The achievable accuracy for systems with multiple ADCs depends directly on the
reference voltages applied to the ADCs. Medical-ultrasound-imaging systems, for
example, commonly include a large number of ADCs in the system's beam-former
electronics, with the ADCs usually organized in groups of 16, 24, 32, and so on....
[Design Idea by Ron Gatzke and Tanja Hofner, Maxim Integrated Products, Sunnyvale, CA] |
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Compact Step-Up Converter Conserves Battery Power - DN358 Design Notes
(Linear Technology) (app note added 2/06) |
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Constant Current Battery Charger - A simple method of charging a battery
from a higher voltage battery is shown in the circuit below to the left. Only one
resistor is needed to set the desired charging current and is calculated by dividing
the difference in battery voltages by the charge current. So, for example if 4 high
capacity (4000 mA hour) ni-cads are to be charged at 300 mA from a 12 volt battery,
the resistor need,.... [Bill Bowden's website] |
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Create a Virtual Ground with the LT1118-2.5 Sink/Source Voltage Regulator -
DN115 Design Notes (Linear Technology) (app note added 2/06) |
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Current-sensing scheme improves PFC on/off sequence - 27-Jun-02 Issue of EDN
PFC (power-factor-correction] preconverters typically use the step-up, or boost,
configuration, because this type of converter is relatively easy to implement (Figure
1). However, this topology requires the output voltage to be higher than the input
voltage. When this condition is not the case—for example, with on/off sequences or
under load conditions—some inrush current flows thro.... [Design Idea by Joël Turchi,
On Semiconductor, Toulouse, France] |
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