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Regulated Power
Supply Circuits, Page 2
Last Updated on:
Monday, October 03, 2011 06:08 PM
Regulated Power Supplies:
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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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,.…. [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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Boosted LM317/LM337 Regulators - Transistors types have been altered to ones
that are more readily available. ….(electronic schematic added 11/08) |
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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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Calibrated trim tool tweaks multiturn pots - 01/07/99 Issue of EDN Many
analog circuits contain multiturn trimming potentiometers whose settings you may need to
change during maintenance or calibration. Also, some instruments have panel-mounted
potentiometers that may need periodic adjustments. After disturbing a setting by more than
one or two turns, it becomes difficult or impossible to restore the original setting. The
usual method....Page includes several designs. Scroll to find this one.... [Design
Idea by Sanjay Chendvankar, Tata Institute, Mumbai, India] |
Dual Polarity Power Supply - 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.
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Dual Regulated Power Supply - 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. ….(electronic
schematic added 08/08) |
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Dual Regulated Power Supply-PSU - 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 about 18 volts at 1 amp or higher,allowing for
losses in the regulator. An application for this type of circuit would be for a small
regulated bench power supply.... [Circuit by Andy Collison] |
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Dual-polarity supply provides ±12V from one IC - 29-Apr-04 Issue of EDN
Well-regulated, dual-polarity power supplies find wide use in disk-drive, handheld-device,
automotive, and notebook-computer applications. In these applications, board space and
allowable component heights are continually shrinking. So, power-supply designers face the
challenge of providing split rails with as few parts as possible, thus saving board space
and cost.... [Design Idea by Keith Szolusha, Linear Technology Corp, Milpitas, CA] |
| Dual-voltage regulator meets USB-power needs -
19-Aug-04 Issue of EDN This Design Idea stems from the limited availability of IC voltage
regulators that can meet key USB-power specs, coupled with the need for turn-on sequencing
and rise-time control at each output. As always, for PC-related designs, minimum cost is a
primary motivation. USB specs require all loads to limit inrush current to less than 100
mA plus 50 µC of charge when powered on.... [Design Idea by Wayne Rewinkel, National
Semiconductor, Phoenix, AZ] |
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Finesse Regulator Noise - System designers often find themselves battling power
supply hum, noise, transients, and various perturbations wreaking havoc with low noise
amplifiers, oscillators, and other sensitive devices. Many voltage regulators have
excessive levels of output noise including voltage spikes from switching circuits and high
flicker noise levels from unfiltered references....(electronic circuit added 7/03)
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High Current LM317 Regulated Power Supply - The high current regulator below
uses an additional winding or a separate transformer to supply power for the LM317
regulator so that the pass transistors can operate closer to saturation and improve
efficiency. For good efficiency the voltage at the collectors of the two parallel 2N3055
pass transistors should be close to the output voltage. ….(design added 11/08)
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Hot Swap & Blocking FET Control using 2 x ADM1073 Hot Swap Controllers - AN-694
Analog Devices Application Note....[App Note] |
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Hot Swap & Buffer I2C Buses - DN263 Design Notes (Linear Technology) (app
note added 6/06) |
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Hot Swap Circuit Meets Infiniband Specification - DN265 Design Notes
(Linear Technology) (app note added 6/06) |
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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. (added
6/06) |
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Hot Swapping the PCI Bus - DN155 Design Notes (Linear Technology) (app
note added 6/06) |
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Hot-Plug & Hot-Swap Bus Switches - Pericom Semiconductor Application Note # 052
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Hot-swap circuit allows two computers to monitor an RS 232 channel - 29-May-08
Issue of EDN A hot-swap serial-interface circuit allows two computers to monitor all
the traffic on an RS-232 port.... [Design Idea by Jeff Patterson, All Weather Inc,
Sacramento, CA] |
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Hot-swap controller handles dual polarity - 11-Dec-03 Issue of EDN 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.... [Design Idea by Dan
Meeks, Texas Instruments, Manchester, NH] |
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Hot-swap structure offers improved redundancy - 9-Jan-03 Issue of EDN 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.... [Design Idea by Samuel Kerem, Corvus Corp, Columbia, MD] |
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Regulated Power Supplies:
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