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Get Power Out of PC Parallel Port - An article which includes
circuits, shares how to us a parallel port to connect to a very wide
selection of devices like software... |
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High Current Power Supply - Since my page was first posted, I have
received a number of emails asking about a high current power supply. I
looked around, but couldn't find one that was suitable. So, I designed this.
It is a linear supply, which might have a few of you rolling your eyes, but
it takes very few parts, is simple to build and can supply huge currents....
[Aaron Cake] |
| High Current 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. The LM317 requires a
couple... [Bill Bowden's circuit] |
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High Current Regulated Supply - Current of LM317 voltage is
increased by using an additional power transistors. ….(electronic schematic
added 11/08) |
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High Current Voltage Regulation - Connect voltage regulators in parallel to
increase the current which can be regulated…. [REUK - Renewable Energy UK website] |
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High Efficiency Linear Regulators - AN32 Linear Technology Presents circuit
techniques permitting high efficiency to be obtained with linear regulation.
Particular attention is given to the problem of maintaining high efficiency with
widely varying inputs, outputs and loading. Appendix sections review component
characteristics and measurement methods. |
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High Precision GPS/TV Controlled Reference Oscillator - (circuit / schematic
added 6/05) |
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High Stability Regulators - National Semiconductor Application
Notes,28-Jun-1996/ (app note added 3/03) |
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High Voltage Buck Regualtors provide High Current Low Profile Power Solutions for
FireWire Peripherals - DN287 Design Notes (Linear Technology) (app
note added 1/06) |
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High-current supply uses standard three terminal regulator - 22-Jul-04 Issue
of EDN Voltage-regulator design for high output currents can be a critical and
difficult task. Although voltage regulators with 1A maximum output current are simple
to design, thanks to 78xx three-terminal voltage regulators, at output currents higher
than 1A output, problems arise. For high output currents, voltage regulators usually
use parallel-connected power transistors.... [Design Idea by I Hakki Cavdar, Karadeniz
Technical University, Trabzon, Turkey] |
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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 3/05) |
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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 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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HT0640 for Electronic Line Switch - Supertex Semiconductors (app note
added 2/06) |
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Hysteretic regulators provide high performance at low-cost - 2-Sep-04 Issue
of EDN Hysteretic voltage regulators offer the potential advantages of
simplicity, fast response, 100%-duty-cycle operation, high efficiency at light
loading, and low cost. They need no loop-compensation components to add delays; thus,
response time to a load change is less than one switching cycle. What's the catch? You
must be able to accept a switching frequency that is not precisely controlled and....
[Design Idea by Wayne Rewinkel, National Semiconductor, Phoenix, AZ] |
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IC Provides OnCard Regulation for Logic - National Semiconductor Application
Note 04-Nov-1995/ (app note added 3/03) |
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IC Voltage Reference has 1 PPM Per Degree Drift - National Semiconductor
Application Note 04-Nov-1995/ (app note added 3/03) |
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Improving Power Supply Reliability with IC Power Regulators - National
Semiconductor Application Note 04-Nov-1995/ (app note added 3/03) |
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Increasing Regulator Current - An outboard pass transistor used to increase
the current output of a voltage regulator IC….(added 01/2010) [Andy Collison -
designer] |
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Inverted regulator increases choice and reduces complexity - 15-Dec-09 Issue
of EDN A simple approach for any high side overcurrent-protection circuit
references the entire circuit to the high-side rail.... [Design Idea by David
McCracken, Aptos, CA] |
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L200 Power Supply - Power supply with variable voltage and fixed current
regulation made using the ubiquitous L200C regulator…. [Design by Andy Collison] |
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Lantern Flasher/Dimmer - The electronic lantern control circuit adds
high-efficiency dimming and flashing to an existing battery-powered lantern or
flashlight or to a custom design. For the car it makes a great lamp for changing
a flat tire, back seat reading or emergency engine work. The flasher mode is
useful for warning other drivers of your troubles and it may be adjusted ,.... [Tony
van Roon's circuit] |
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Lantern Flasher/Dimmer (techlib) - The electronic lantern control circuit
(fig. 1) adds high-efficiency dimming and flashing to an existing battery-powered
lantern or flashlight or to a custom design. For the car it makes a great lamp for
changing a flat tire, back seat reading or emergency engine work. The flasher mode is
useful for warning other drivers....(circuit / schematic design added 6/06)
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Lantern Flasher/Dimmer (tomzi.geo) - Basically a high-efficiency dimmer, but
can also be used as a flasher. In dimmer mode, the LM358 (dual op-amp) is wired to
send pulses at a constant frequency. By adjusting the width of these pulses,
brightness of the bulb is controlled. In flasher mode, the same potentiometer(circuit
/ schematic added 03/0303) |
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LB-15: Linear Brief 15 High Stability Regulators - National Semiconductor
Application Note (app note added 2/06) |
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LB-34: Linear Brief 34 a Micropower Voltage Reference - National
Semiconductor Application Note (app note added 2/06) |
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LB-41: Linear Brief 41 Precision Reference uses Only Ten Microamperes -
National Semiconductor Application Note (app note added 2/06) |
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LDO Buck/Boost 2 Sync Buck Sync Boost Reference Design - LDO, Buck/Boost, 2
Sync. Buck, Sync. Boost with Vin 2.7-4.2 V LiION or 4.5-6.5 V adapter. Multiple output
voltages of 1.5 V, 2.5 V, 3.3 V and 8 V. The total output power is 5.5 W. (added 3/05)
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LDO Circuit Provides Smart Power Monitoring - 10/24/96 EDN-Design
Ideas....Modern low-dropout (LDO) voltage regulators for battery-powered or other
micropower applications offer a variety of monitoring and diagnostic functions, such
as low-battery and out-of-regulation signals. Dedicated LED indicators for these
diagnostic functions, plus a typical power-on indicator, consume relatively large
amounts of power. This design integrates several power-monitoring/diagnostic
functions.... [Design Idea by Alexander Belousov, Consultant, Rego Park, NY] |
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Light Bulb Voltage Regulator - .... |
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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)....Designed by Andrew R. Morris (added 09/05) |
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Linear and Switching Voltage Regulator Fundamentals - Great article, thanks
to Bryan for finding this one. PDF format. |
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Linear Brief 41 Precision Reference uses Only Ten Microamperes - National
Semiconductor Application Note 02-Mar-1999/ (app note added 3/03) |
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Linear Regulator Converts 3.3 to 2.9V - 03/16/95 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Linear regulator=low-cost dc/dc converter - 13-Jun-02 Issue of EDN The
circuit in Figure 1 is a good choice if you need a power supply with high efficiency
and you don't want to use expensive dc/dc-converter ICs. The heart of the circuit is
IC1, the common, inexpensive LM7805 linear regulator. The external switch is a pnp
transistor; the circuit can easily sourcethan 1A output current.... [Design Idea by
Susanne Nell, Breitenfurt, Austria] |
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Linear Regulators: Theory of Operation & Compensation - National
Semiconductor Application Note 24-May-2000/ (app note added 3/03) |
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LM105 An Improved Positive Regulator - National Semiconductor Application
Note 04-Nov-1995/ (app note added 3/03) |
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LM267X 3A 5A Evaluation Board - The LM267X evaluation board was developed
for the evaluation of LM267X SIMPLE SWITCHER series of 3 Amp and 5 Amp high efficiency
step-down (Buck) switching voltage regulators. (app note added 3/05)
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LM2940 12V 1A Low Dropout Regulator - Find out how to use an LM2940 to
efficiently regulate voltage…. [REUK - Renewable Energy UK website] |
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LM2941 1A Low Dropout Adjustable Regulator - Find out about the LM2941 - an
adjustable regulator with very low dropout voltage…. [REUK - Renewable Energy UK
website] |
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LM317 High Current Voltage Regulator - Find out how to build an LM317T based
high current voltage regulator…. [REUK - Renewable Energy UK website] |
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LM317 Regulator Circuit - I constructed this voltage regulator to power my
two way mobile radio from the car cigarette lighter circuit. It has many other uses
and the voltage can easily be adjusted by the use of a potentiometer. The voltage
regulator is an LM317T, and should accept up to about 14 volts without problems. It
can handle up to 1 amp, but you WILL need a heatsink on the voltage regulator....
[Matthew Hewson] |
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LM317 Regulator with Pass Transistor - The LM317T output current can be
increased by using an additional power transistor to share a portion of the total
current. The amount of current sharing is established with a resistor placed in series
with the 317 input and a resistor placed in series with the emitter of the pass
transistor. In the figure below, the pass transistor will start conducting when the
LM317 current reaches about 1 amp, due to the voltage drop across the 0.7 ohm
resistor.... [Bill Bowden] |
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LM317 variable power supply - A truly timeless circuit. LM317 is a versatile
and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current
with a large heat sink. It's ideal for just about any application. This was my
first workbench power supply and I still use it. Since LM317 is protected
against short-circuit, no fuse is necessary....(added 10/05) |
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LM317 Variable Voltage Regulator - The LM317T is a adjustable 3 terminal
positive voltage regulator capable of supplying in excess of 1.5 amps over an output
range of 1.25 to 37 volts. The device also has built in current limiting and thermal
shutdown which makes it essentially blow-out proof.... [Bill Bowden design this one] |
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LM317T Voltage Regulator Chip - Learn about the LM317T and its uses in
renewable energy projects…. [REUK - Renewable Energy UK website] |
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LM340 Series Three Terminal Positive Regulators - National Semiconductor
Application Note 04-Nov-1995/ (app note added 3/03) |
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LM385 Feedback Provides Regulator Isolation - National Semiconductor
Application Note (app note added 2/06) |
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LM78S40 Switching Voltage Regulator Applications - National Semiconductor
Application Note (app note added 2/06) |
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Logic PSU with OverVoltage Protection - 6 volt regulated power supply for
TTL and 74LS series integrated circuits, includes output Overvoltage fault protection…
[Andy Collison, designer] |
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Low Voltage High Current Time Delay Circuit - (circuit / schematic added
2/03) |
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Low-Battery Detector Preregulates Input Voltage - 08/15/96 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search the "title"
+ "EDN" for new link. |
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Low-dropout 12V regulator LM324 - Most regulator circuits require at least 3
to 5 volts between input and output to operate reliably. This regulator features
a P-Channel MOS-FET pass element that will allow for a very low drop out voltage.
In my particular application reliable operation was noted down to nearly 0.1 volt
between input and output at nearly 0.8 amperes of load current. Useful
applications include automotive and battery applications were regulation is desired
and available input-output differential.... [Designer is Robert A. Jones] |
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Low-dropout linear regulators deliver constant-currents - 11-May-06 Issue of
EDN High-side current source uses a positive-output linear voltage regulator to
deliver 25 mA.... [Design Idea by Budge Ing, Maxim Integrated Products Inc, Sunnyvale,
CA; Edited by Brad Thompson and Fran Granville] |
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Low-dropout linear regulators double as voltage supervisor circuits -
16-Mar-06 Issue of EDN You can use this circuit as a voltage supervisor or as a
controlled-characteristic linear-voltage regulator.... [Design Idea by William
Lepkowski, On Semiconductor, Tucson, AZ; Edited by Brad Thompson and Fran Granville] |
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Low-dropout regulator, SMPS cascade suppress ripple, maintain efficiency -
3-Aug-06 Issue of EDN Two regulators work better than one in noise-sensitive
applications.... [Design Idea by Scot Lester, Texas Instruments, Dallas, TX; Edited by
Brad Thompson and Fran Granville] |
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LT1580 Fast Response Low Dropout Regulator Achieves 0.4 Dropout at 4 Amps -
DN119 Design Notes (Linear Technology) (app note added 2/06) |
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Luxeon for Camera Phone Flash PDA & DSC Applications - This reference design
outlines the key considerations in the construction of a solid state, high performance
flash solution utilizing Luxeon LED technology. This design integrates Lumileds’
high power Luxeon Emitters product with a cost effective lens solution to provide the
necessary light output and illumination pattern suited to digital still camera
(DSC)....(added 3/05) |
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