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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 protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard
readers and many circuits. (Electronic circuit added 5/02) |
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Ground
Rules for High Speed Circuits: AN-214 - Analog Devices Application Note (app note added 2/06) Layout and Wiring Are Critical in Video Converter Circuits. |
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High Current Power Supply: (circuit / schematic added 6/05) |
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High Current Regulated 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 extra volts on the input side, plus the emitter/base drop of the 3055s,.... (added 05/07) |
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High Current regulated Power Supply #2: (added 04/05) |
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High Current Regulated Power Supply #3: (added 04/05) |
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High Current supply uses standard three terminal regulator: 07/22/04 EDN Design Ideas / (added 1/05) This
Design Idea implements a simple voltage regulator that delivers high output current. The basic idea is to parallel-connect multiple three-terminal regulators. |
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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/ (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) (added 1/06) |
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HighEfficiency Regulator has Low DropOut Voltage: National Semiconductor Application Note 01-May-1998/ (added 3/03) |
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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 design added 3/05) |
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Hot swap structure offers improved redundancy: 01/09/03 EDN Design Ideas / (added 1/05) 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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HT0640 for Electronic Line Switch: Supertex Semiconductors (app note added 2/06) |
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HV8XX Series: Supertex Semiconductors (app note added 2/06) |
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Hysteretic regulators provide high Performance at Low cost: 09/02/04 EDN Design Ideas / (added 1/05)
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...... |
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IC Provides OnCard Regulation for Logic: National Semiconductor Application Note 04-Nov-1995/ (added 3/03) |
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IC Voltage Reference has 1 Ppm Per Degree Drift: National Semiconductor Application Note 04-Nov-1995/ (added 3/03) |
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Improving Power Supply Reliability with IC Power Regulators: National Semiconductor Application Note 04-Nov-1995/ (added
3/03) |
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Increasing Regulator Current: you can boost 78xx regulator output with1-power transistor (Electronic circuit added 5/02) |
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Keys to Longer Life for CMOS: AN-349 - Analog Devices Application Note (app note added 2/06) Here's How CMOS Can be Protected Against Abuse |
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L200 Regulator Circuit: easy to power supply with1-single L200 IC, offers a variable current limit of up to2 A, as well as
voltage regulation (Electronic circuit added 5/02) |
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Lantern Flasher/Dimmer: (circuit / schematic added 2/03) |
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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. (circuit design added 3/05) |
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LDO Circuit Provides Smart Power Monitoring: 10/24/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)
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Light Bulb Voltage Regulator : (circuit added 7/02) |
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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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Linear Brief 41 Precision Reference uses Only Ten Microamperes: National Semiconductor Application Note 02-Mar-1999/ (added
3/03) |
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Linear Regulator Converts 33 to 29V: 03/16/95 EDN-Design Ideas / (added 03/03) |
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Linear regulator=Low cost DC/DC converter: 06/13/02 EDN Design Ideas / (added 1/05) 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 source more than 1A output current.... |
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Linear Regulators Theory of Operation and Compensation: National Semiconductor Application Note 24-May-2000/ (added 3/03) |
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LM105An Improved Positive Regulator: National Semiconductor Application Note 04-Nov-1995/ (added 3/03) |
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LM125 Precision Dual Tracking Regulator: National Semiconductor Application Note 24-Feb-1999/ (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. (circuit design added 3/05) |
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LM317 Regulator Circuit: (Electronic Schematic / circuit added 4/02) |
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LM317 Regulator with Pass Transistor: (Electronic Schematic / circuit added 4/02) |
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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. Thanks to automatic thermal shutdown, it will turn off if heating excessively. All in all, a very powerful (and affordable!) package,
indeed. Although LM317 is capable of delivering up to 37V, the circuit pictured here is limited to 25V for the sake of safety and simplicity. Any higher output voltage would require
additional components and a larger heat sink. Make sure that the input voltage is at least a couple of Volts higher than the desired output. It's ok to use a trimmer if you're building a
fixed-voltage supply. (added 10/05) |
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LM317 Variable Voltage Regulator: (Electronic Schematic / circuit added 4/02) |
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LM340 Series Three Terminal Positive Regulators: National Semiconductor Application Note 04-Nov-1995/ (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: 5 volt regulated power supply for TTL and 74LS series integrated, includes output
overvoltage fault protection/ (added 3/03) |
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Low Battery Detector Preregulates Input Voltage: 08/15/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)
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Low Drop Regulator (postscript File): (circuit / schematic added 2/03) |
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Low Voltage High Current Time Delay Circuit: (circuit / schematic added 2/03) |
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Low-dropout 12V regulator (LM324): (circuit / schematic added 6/05) |
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Low-dropout linear regulators deliver constant currents: 5/11/06 EDN - Design Ideas / (added 10/06)
High-side current source uses a positive-output linear voltage regulator to deliver 25 mA. |
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Low-dropout linear regulators double as voltage-supervisor circuits: 3/16/06 EDN - Design Ideas /
(added 10/06) You can use this circuit as a voltage supervisor or as a controlled-characteristic linear-voltage regulator. |
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Low-dropout regulator, SMPS cascade suppress ripple, maintain efficiency: 8/3/06 EDN - Design Ideas /
(added 10/06) Two regulators work better than one in noise-sensitive applications. |
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LT1580 Fast Response Low Dropout Regulator Achieves 0.4 Dropout at 4 Amps: DN119 - Design Notes (Linear Technology)
(added 2/06) |
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Luxeon for Camera Phone Flash PDA and 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) and mobile phone camera flash applications. applications. (circuit design added 3/05) |
