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12 Volt Power Supply: Please operate caution when building this power
supply. It is run on standard 117 ac current - and under the right circumstances 117
ac can kill you. Use a plastic enclosure if possible to decrease chances of
short-circuiting. Don't use the power supply if it's wet, and never run it without the
specified fuse. (Electronic circuit added 4/05) |
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13.8 Volt 20PSU: This is a Regulated DC power supply with short circuit
protection and with current limiter. (Circuit / schematic design added 6/06) |
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13.8V 20PSU: This is a Regulated DC power supply with short circuit
protection and with current limiter. (added 10/05) |
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24V/48V Hot Swap™ Controller: DN226 - Design Notes (Linear Technology)
(Circuit / schematic design added 6/06) |
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25 Watt MOSFET Amplifier: High Quality simple unit. No need for a
Preamplifier (Circuit / schematic design added 6/06) |
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9 Volt 2PSU: A simple 9 Volt 2 amp supply using a single IC regulator.
(Circuit / schematic design added 6/06) |
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A 13.8V 20A PSU: This is a Regulated DC power supply with short circuit
protection and with current limiter. (added 10/05) |
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A 24V/48V Hot Swap™ Controller: DN226 - Design Notes (Linear
Technology) (Circuit / schematic design added 6/06) |
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A 9V 2A PSU: 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 78S09 can deliver up to 2 amps continuous output whilst maintaining a low noise
and very well regulated supply. The circuit will work without the extra components,
but for reverse polarity protection a 1N5400 diode is provided at the input, extra
smoothing being provided by C1. The output stage includes C2 for extra filtering, if
powering a logic circuit than a 100nF capacitor is also desirable to remove any high
frequency switching noise. (added 11/05) |
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ADM1070 Hot Swap Controller: AN-591 - Analog Devices Application Note
(Circuit / schematic design added 6/06) This App Note Describes Operation
of the ADM1070 Under Various Hot Swap Insertion and Removal Conditions. |
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Advanced TCA Hot Swap Controller Eases Power Distribution: DN353 -
Design Notes (Linear Technology) (Circuit / schematic design added 6/06) |
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AN-1304: LM5068-48V Hot Swap Controller: National Semiconductor -
Application Note (Circuit / schematic design added 6/06) |
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AN-694: Hot Swap and Blocking FET Control using 2 x ADM1073 Hot Swap Controllers:
AN-694 - Analog Devices Application Note (Circuit / schematic design added
6/06) |
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Bench Top Power Supply Auto-Fan: (Circuit added 9/04) |
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Bench Top Power Supply Part 1: (Circuit added 9/04) |
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Bench Top Power Supply Part 2: (Circuit added 9/04) |
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Bench Top Power Supply Part 3: (Circuit added 9/04) |
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Bench Top Power Supply Part 4: (Circuit added 9/04) |
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Boosting Regulator Current: Although the 78xx series of voltage regulators
are available with different current outputs, you can boost the available current
output with this circuit. A power transistor is used to supply extra current to the
load the regulator, maintaining a constant voltage. Currents up to 650mA will
flow through the regulator, above this value and the power transistor will start to
conduct, supplying the extra current to the load. This should be on an adequate heat
sink as it is likely to get rather hot. Suppose you use a 12v regulator, 7812. The
input voltage should be a few volts higher to allow for voltage drops. Assume 20
volts. Lets also assume that the load will draw 5amps. The power dissipation in the
transistor will be Vce * Ic or (20-12)*8=40watt. It may keep you warm in the
Winter, but you will need a large heatsink with good thermal dissipation. If you want
to increase the output current with a negative regulator, such as the 79xx series,
then the circuit is similar, but an NPN type power transistor is used instead.
(added 10/05) |
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Design Guidelines for Compactpci Hot Swap Control Applications using the LTC1644:
Design Solutions 12 - Design Notes (Linear Technology) (Circuit /
schematic design added 6/06) |
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Finesse Regulator Noise: (added 8/03) |
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Hot Swap and Blocking FET Control using 2 x ADM1073 Hot Swap Controllers:
AN-694 - Analog Devices Application Note (Circuit / schematic design added
6/06) |
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Hot Swap and Buffer I2C Buses: DN263 - Design Notes (Linear
Technology) (Circuit / schematic design added 6/06) |
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Hot Swap Circuit Meets Infiniband Specification: DN265 - Design Notes
(Linear Technology) (Circuit / schematic design added 6/06) |
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Hot Swap Controller Handles Dual Polarity: 12/11/03 EDN Design Ideas /
(added 1/05) Some applications require a hot-swap controller, a circuit-breaker
function, or both for dual-polarity, dc-input power-supply rails. In some hot-swap
cases, the requirement is based only on inrush-current considerations. Control of the
inrush current is necessary to eliminate connector stress and glitching of the
power-supply rails.... |
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Hot Swap Push-Pull Sync. Buck Negative Flyback Dual Sync. Buck Reference Design:
Hot Swap, Push Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck with Vin of -36 V
to -72V. Vout of 8 V, 5 V, 3.3 V, 2.5 V and -5 V. The output power is 79.5 W.
(Circuit / schematic design added 6/06) |
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Hot swap structure offers improved redundancy: 01/09/03 EDN-Design
Ideas / (Circuit / schematic design added 6/06) For redundancy purposes, a number of
power supplies, using ORing diodes, can work into the same load. During maintenance,
when you can remove any power supply, the minimum possible power perturbation at the
load is desirable. To compensate for the voltage drop across the ORing diodes, you
must connect the power-supply feedback lines after the diodes, at the load... |
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Hot Swapping the PCI Bus: DN155 - Design Notes (Linear Technology)
(Circuit / schematic design added 6/06) |
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Hot-Plug and Hot-Swap Bus Switches: Pericom Semiconductor Application Note #
052 (added 2/05) |
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Line Power Supply: This circuit provides a regulated output without a power
transformer. It is similar to common circuits, except that a zener diode is replaced
with an SCR. This is far more robust against line voltages surges than a zener diode
version, plus there is no heat generation. C1 sets the available current (20mA/uF @
60Hz). R3 sets the output voltage (~.55V/K). The bipolar outputs are separately
adjustable by R3 and R5.
Designed by Andrew
R. Morris
(added 09/05) |
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LM317 Regulator with Pass Transistor: (added 10/05) |
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LM5068-48V Hot Swap Controller: National Semiconductor - Application Note
(Circuit / schematic design added 6/06) |
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Low Voltage Hot Swap Controller Ignores Backplane Noise and Surges: DN319 -
Design Notes (Linear Technology) (Circuit / schematic design added 6/06) |
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LTC1645 Dual Channel Hot Swap Controller/Power Sequencer: DN217 -
Design Notes (Linear Technology) (Circuit / schematic design added 6/06) |
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LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus
for 5V-/3.3V-Only Applications: DN253 - Design Notes (Linear
Technology) (Circuit / schematic design added 6/06) |
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Regulated 12 Supply: 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. This circuit is also known as an amplified
zener circuit. (added 10/05) |
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Safe Hot Swapping using the LTC1421: DN139 - Design Notes (Linear
Technology) (Circuit / schematic design added 6/06) |
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Simple V COM adjustment uses any logIC Supply Voltage: 09/30/04 EDN Design
Ideas / (added 1/05) All TFT (thin-film-transistor) LCD panels
require at least one appropriately tuned V COM signal to provide a reference point for
the panel's backplane. The exact value of V COM varies from panel to panel, so the
manufacturer must program the voltage at the factory to match the characteristics of
each screen.... |
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Soft Start power Supply: The output voltage rises slowly and reaches 15 V in
5 seconds. In order to perform this soft-start function, the LM317 voltage
regulator IC requires an external universal PNP transistor and the L200 uses its
internal comparator (pin 2). After switch-on, the rising voltage on the positive
side of the charging electrolytic capacitor slowly turns the (initially conducting)
transistor off, thus raising the voltage (relative to ground) on the adjustment pin of
the LM317. In the L200 circuit, the corresponding electrolytic capacitor's rising
voltage gradually relaxes the current-regulation loop inside the L200.
(added 10/05) |
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UltraLow Noise Switching Power Supplies Simplify EMI Compliance: DN316 -
Design Notes (Linear Technology) (added 1/06) |
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Universal PSU: A Universal Power supply based on the L200 regulator, which
includes an outboard pass transistor to boost output currents up to 4 amps.
(added 11/05) |
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V COM Adjustment uses Any Logic Supply Voltage: 09/30/04 EDN Design Ideas
/ (added 1/05) All TFT (thin-film-transistor) LCD panels require at least
one appropriately tuned V COM signal to provide a reference point for the panel's
backplane. The exact value of V COM varies from panel to panel, so the manufacturer
must program the voltage at the factory to match the characteristics of each
screen.... |
