|
+5 Volt Power Supply Circuit:
|
|
0 to 24 Volt 4Adjustable Power
Supply #1: 0-24V4A
adjustable power supply, text in Finnish
|
|
0 to 30 Volt Lab Supply:
|
|
1.2 to 25 Volt DC At 4Power
Supply Schematic:
built using discrete transistors and 741 OpAmp,
read circuit description |
|
|
|
1.2 Volt Reference:
National Semiconductor Application
Notes,04-Nov-1995 |
|
12 Volt 30 Amp Power Supply:
uses a single 7812 IC voltage regulator and
multiple outboard pass transistors, this power
supply can deliver output load currents of up
to30 amps |
|
12 Volt Alarm Power Supply:
|
|
12 Volt DC Power Supply:
|
|
12 Volt RMS to 10 Volt Voltage
Regulator: will take
a12V RMS sinusoidal input from a transformer and
provide a10-Volt DC output at100 mA with very
good regulation |
|
12 Volt to 9 Volt DC Converter:
Car Converter for12 Volt to 9V
|
|
12-V Amplifier Is Designed Using
Low-Voltage Digital Potentiometer:
02/19/01 Electronic Design - Ideas for Design /
Analog circuits today are typically biased from
�5 V to �18 V. But the trend is toward lower
voltages. For this reason, many components are
designed to operate primarily in �5-V systems.
One example is the digitally controlled. . . |
|
13.8 Volt 20PSU:
This is a Regulated DC power supply with short
circuit protection and with current limiter.
|
|
1Variable Regulated Power Supply:
|
|
230 Volt Dimmer:
FAIR WARNING - THIS SITE HAS ANNOYING POP UPS
|
|
5 Volt Power Supply: |
|
78xx Regulator Board:
circuit board and circuit for making voltage
regulators based on 78xx ICs, in PDF format,
text in Finnish |
|
9 Volt 2PSU:
A simple 9 Volt 2 amp supply using a single IC
regulator. |
|
9 Volt Stabilized Power Supply:
|
|
Active Preloading Provides
Sinking Capability:
01/02/97 EDN-Design Ideas -- A simple add-on
circuit enables a unipolar power supply, usually
a current-sourcing circuit only, to sink current
from a load |
|
Adjustable 3Terminal Regulator
for LowCost Battery Charging Systems:
National Semiconductor Application Notes,
28-Jun-1996 |
|
Adjustable LNB power supply is
DiSEqC-compatible:
04/20/98 Electronic Design - Ideas for Design /
The circuit shown provides a digitally
switchable 13 V or 17 V for the low-noise block
(LNB) typically found in satellite receivers at
the antenna feedhorn. This variation of supply
voltage “tells” the remotely located LNB
electronics whether it. . . |
|
Adjustable Power Supply:
well filtered variable1.2-30 volts at5 amps
using LM338K |
|
Adjustable power supply
: |
|
Adjustable Power Supply using
LM317: voltage
regulator for1.2V to35-Volt output voltages and
up to1A load |
|
Alarm PSU: |
|
Applications for An Adjustable IC
Power Regulator:
National Semiconductor Application
Notes,04-Nov-1995 |
|
Automatic Local Sensing Improves
Regulation: 1/04/96
EDN-Design Ideas |
|
Bench Top Power Supply, Auto-Fan:
|
|
Bench Top Power Supply, Part 1: |
|
Bench Top Power Supply, Part 2: |
|
Bench Top Power Supply, Part 3: |
|
Bench Top Power Supply, Part 4: |
|
Capacitance Multiplier Power
Supply for Class a Amplifiers:
|
|
Car Battery Charger:
quickly and easily charge most any lead acid
battery, automatically turns charging off when
ready |
|
Car Converter for 12 Volt to 9V:
|
|
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 (18V total). |
|
Change Improves Regulators’
Reliability: 05/12/94
EDN-Design Ideas |
|
Circuit improves on bias for GaAs
FETs: 12/06/2001 EDN
- Design Ideas / 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... . |
|
Circuit Measures Small Currents
Referenced To High-Voltage Rails:
01/07/02 Electronic Design - Ideas for Design /
Designs that need to measure small signals
riding on high-voltage power rails suggest the
use of isolation devices. However, a
high-common-mode-voltage instrumentation
amplifier used with a rail-to-rail input and
output amplifier can recover the. . . |
|
Circuit provides reference for
multiple ADCs:
01/24/2002 EDN - Design Ideas / 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. . |
|
Combine A Hot-Swap Circuit With A
Linear Regulator:
11/08/99 Electronic Design - Ideas for Design /
Some applications require both a hot-swap
circuit to limit inrush currents and a linear
regulator to maintain a constant output voltage
from minimum to maximum load current. To
compensate for the. . . |
|
Constant Current Battery Charger: |
|
Current-sensing LDO voltage
regulator: 04/20/98
Electronic Design - Ideas for Design / When
designing battery-operated devices, battery
contact chatter can be prove to be a difficult
problem to overcome. When the chatter occurs at
a critical time, the results can often be
devastating. For instance, if a memory write
takes place during a. . . |
|
DAC & OpAmp Provide Variable
Control Voltage:
12/06/01 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit
|
|
DC Adapter Power Supply:
DC voltage "virtual earth" circuits
|
|
Digitally Adjust Regulator's
Output Using A JFET Interface:
04/29/02 Electronic Design - Ideas for Design /
Often, electronic systems are guaranteed to
operate with any supply voltage, within a given
VCC range. Testing these circuits requires a
regulated voltage supply that can be
automatically incremented, from a minimum to a
certain maximum.. . . |
|
Drawing Power From a PC Serial
Port: This circuits
derives fairly low power, (mA at5V) from a
RS-232 serial connection. (NOTE: ASCII drawing)
|
|
Dual + / 15 Volt Power Supply:
suitable for powering OpAmp circuits
|
|
Dual 12V Power Supply:
|
|
Dual Polarity Power Supply 1:
supply is easy to build and adjustable from0-15
volts |
|
Dual Regulated Power Supply: |
|
Dual Tracking + 15v:
|
|
Explanation & Experiment About
Regulated DC Power Supply:
many power supply designs for different
voltages, built from discrete components
|
|
Extend the input range of a low
dropout regulator:
10/17/2002 EDN - Design Ideas / Because of
process limitations, all ICs have an
input-voltage limitation. This limitation can be
cumbersome when you try to step down a high
supply voltage to a lower, regulated voltage
using a dc/dc converter, such as a linear
regulator. Adding a FET to the input of a linear
regulator creates a dc/dc converter with a wider
input-voltage range than the range of the
regulator alone |
|
Finesse Regulator Noise: |
|
Fixed Voltage Power Supply:
|
|
Get Low-Impedance Scaled Voltages
With Everyday Parts:
02/17/03 Electronic Design - Design Briefs / The
precise combination of common, inexpensive
components can yield a scaled regulated voltage
with a very low output impedance and high
current output capability. It's especially
useful when the output is scaled to one-half of
the input value to. . . |
|
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. |
|
High Current Power Supply:
|
|
High Stability Regulators:
National Semiconductor Application
Notes,28-Jun-1996 |
|
HighEfficiency Regulator has Low
DropOut Voltage:
National Semiconductor Application
Notes,01-May-1998 |
|
Hot swap higher voltage supplies:
04/19/99 Electronic Design - Ideas for Design /
Some applications, such as communications,
fault-tolerant computer systems, and networking,
require circuit boards to be inserted into a
backplane without turning the power off. The
bulk supply. . . |
|
Hot swap structure offers
improved redundancy:
01/09/03 EDN-Design Ideas / 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... |
|
IC Provides OnCard Regulation for
Logic: National
Semiconductor Application Notes,04-Nov-1995 |
|
IC Voltage Reference has 1 Ppm
Per Degree Drift:
National Semiconductor Application
Notes,04-Nov-1995 |
|
Improving Power Supply
Reliability With IC Power Regulators:
National Semiconductor Application
Notes,04-Nov-1995 |
|
Increasing Regulator Current:
you can boost 78xx regulator output with1-power
transistor |
|
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 |
|
Lantern Flasher / Dimmer:
|
|
LDO Circuit Provides Smart Power
Monitoring: 10/24/96
EDN-Design Ideas |
|
LDO Regulator Works With VOUT
Lower Than Its Internal VREF:
12/18/03 Electronic Design - Design Briefs / The
reference voltages of standard low-dropout (LDO)
linear regulators are usually in the 1.2- to
1.25-V range. But that's not low enough to meet
the latest CPU and logic voltage requirements,
which can be as low as 0.9 V. That is, the
reference. . . |
|
Light Bulb Voltage Regulator
: |
|
Linear Brief 41 Precision
Reference Uses Only Ten Microamperes:
National Semiconductor Application
Notes,02-Mar-1999 |
|
Linear Regulator Converts 3.3 to
2.9V: 03/16/95 EDN-Design
Ideas |
|
Linear regulator=low cost dc/dc
converter:
06/13/2002 EDN - Design Ideas / 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.. |
|
Linear Regulators Theory Of
Operation & Compensation:
National Semiconductor Application
Notes,24-May-2000 |
|
LM105An Improved Positive
Regulator: National
Semiconductor Application Notes,04-Nov-1995 |
|
LM125 Precision Dual Tracking
Regulator: National
Semiconductor Application Notes,24-Feb-1999 |
|
LM317 Adjustable Power Supply: |
|
LM317 Regulator Circuit: |
|
LM317 Regulator With Pass
Transistor:
|
|
LM317 Variable Power Supply:
|
|
LM317 Variable Voltage Regulator:
|
|
LM340 Series Three Terminal
Positive Regulators:
National Semiconductor Application
Notes,04-Nov-1995 |
|
Logic PSU With Overvoltage
Protection: 5 volt
regulated power supply for TTL and 74LS series
integrated, includes output overvoltage fault
protection |
|
Low Battery Detector Preregulates
Input Voltage:
08/15/96 EDN-Design Ideas |
|
Low Drop Regulator (postscript
File): |
|
Low Voltage, High Current Time
Delay Circuit: |
|
Low-Dropout Current Regulator
Improves LED Driver Efficiency:
11/06/00 Electronic Design - Ideas for Design /
With the proliferation of batterypowered
designs, efficient power management becomes
crucial in maximizing battery life. Although
light-emitting diodes (LEDs) consume a large
portion of the battery current in many
applications, they’re necessary and. . . |
|
Measurement Circuit Features High
CommonMode Rejection : 07/22/02 Electronic Design - Ideas for Design
/ Modern measurement systems often operate with
single 5-V power supplies, yet their input
signals may have large common-mode voltages that
exceed the supply by tens or hundreds of volts.
Also, unless the converter is driven
differentially, the noise on... |
|
Micropower Voltage Reference:
National Semiconductor Application
Notes,28-Jun-1996 |
|
MOSFET Circuit UPS Regulator's
Output Current:
02/01/96 EDN-Design Ideas / Use a current mirror
and a power MOSFET to increase the
output-current capability of an IC-voltage
regulator |
|
MOSFET switch provides efficient
AC / DC conversion:
02/17/00 EDN-Design Ideas |
|
Negative Regulator has <0.4 Volt
Dropout Voltage:
11/06/97 EDN-Design Ideas |
|
Nine-Volt Stabilized Power Supply:
|
|
OpAmp Makes Precise 9 Volt
Battery Splitter:
07/17/97 EDN-Design Ideas / Alkaline 9V
batteries are ideal for many portable, handheld
applications, this circuit generates a bipolar
supply of5V and �2.3 to �4V using a precision5V
reference and one op amp as a supply splitter
|
|
Pass Regulator's Output Ranges
From 0 to 20V:
04/13/95 EDN-Design Ideas |
|
Pass Transistor Lowers Dropout
Voltage: 02/18/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll
to find this circuit |
|
Portable CD Player Adapter for
Car: steps down
the12V from the lighter socket to 9V which is
used by some CD players (Sony Discman)
|
|
Positive regulator makes dual
negative output converter:
06/26/03 EDN-Design Ideas / Some systems, such
as optical networks, require more than one
negative voltage. A common procedure is to boost
the main negative supply of 5V to 10V and then
reduce it with a linear regulator to 9V. The 5V
itself comes from a positive supply, typically 5
or 12V. Independently creating each of the two
negative voltages requires the use of two
switching-regulator ICs... |
|
Positive regulator makes negative
dc/dc converter:
12/26/2002 EDN - Design Ideas /
Power-supply designers can choose from a
plethora of available positive buck regulators
that can also serve as negative boost dc/dc
converters. Some buck regulators have a
negative-feedback reference voltage expressly
for this purpose, but ICs that have
positive-reference feedback voltages far
outnumber these negative-feedback regula |
|
Power Supply Circuit Tracks
Control Input:
12/21/95 EDN-Design Ideas |
|
Power Supply Circuit Tracks
Control Input:
12/21/1995 EDN-Design Ideas/ |
|
Power Supply Converted from a PC
(link):
|
|
Power Supply Cuts Switching Noise
In DDR Memory Systems:
11/11/02 Electronic Design - Ideas for Design /
This design idea describes a unique, low-cost
power-supply circuit for a double-data-rate (DDR)
memory system. Conventional designs for DDR
memories consist of a dual buck converter and a
voltage reference. In contrast, this design
replaces one buck. . . |
|
Power Supply Provides +5 Volt DC
Regulated, +10 Volt DC unregulated & 7.5Volt AC–
Hand Drawn:
|
|
Power Supply Write-Protects
SmartVoltage Memories:
11/03/97 Electronic Design - Ideas for Design /
Second-generation FlashFile memory devices
developed by Intel, which employ the company’s
SmartVoltage technology, can operate with a 5-V
Vpp supply in addition to the established 12 V
Vpp. This dual-operating voltage causes a. . . |
|
Power Supply's Output Tracks
Negative Input By One-Half:
04/26/04 Electronic Design - Design Briefs / In
some fiber-optic communication applications, the
transimpedance amplifier needs a negative bias
voltage that tracks the negative input rail by
one-half for the data signal's common-mode input
range. The circuit in . . . |
|
Power-Supply Failure Alarm: |
|
Protection Feature Enhances Boost
Converter: 10/27/94
EDN-Design Ideas |
|
:
National Semiconductor Application
Notes,04-Nov-1995/ |
|
:
many power supply designs for different
voltages, built from discrete components |
|
: 01/02/97
EDN-Design Ideas / Certain electronic
circuits require extremely low-noise power
supplies and this circuit provides very good
quality power output |
|
: 01/02/97
EDN-Design Ideas --100-mA regulator that uses a
dual linear-regulator IC to produce output
voltages below1.25V from2.9 to5.5V input-voltage
range |
|
: 11/07/96
EDN-Design Ideas |
|
: outputs
regulated +-15-Volt |
|
Shunt Regulator Provides
overvoltage Protection:
01/15/98 EDN-Design Ideas |
|
Simple Regulator has one Active
Part: 03/16/95 EDN-Design
Ideas |
|
Simple Regulator Monitors its
Input Voltage:
09/12/97 EDN-Design Ideas |
|
Supply Saves Circuits From Lax
Predecessors:
11/23/94 EDN-Design Ideas |
|
Terminal Regulator Is Adjustable:
National Semiconductor Application
Notes,08-Nov-2000 |
|
Transformerless Power Supply:
Important Warning: This is a power supply
project without using a power supply. This can
save the expense of buying a transformer, but
presents potentially lethal voltages at the
output terminals.Under no circumstances should a
beginner attempt to build such a project.
|
|
Transistor quickly Wakes Sleeping
LDO: 09/01/98 EDN-Design
Ideas |
|
Two ACels Power Step Down
Regulator: 01/07/99
EDN-Design Ideas / PDF contains multiple
circuits - scroll to find this circuit.
|
|
Universal DC to DC Converter: |
|
Variable 3 to 24 Volt / 3 Amp
Power Supply:
regulated power supply can be adjusted from3
to25 volts and is current limited |
|
Variable DC Power Supply:
Voltage range:0.7-24 Volt Current limiting
range:50mA-2A |
|
Variable DC Power Supply:
based on versatile L200 voltage regulator,
independent voltage (3-15V) and current
(10mA-2A) limits |
|
Variable Dual Lab Power Supply:
can supply from +/-1.2V up to about +/-25V, will
current limit at around 800mA
|
|
Variable load tests voltage
sources: 07/19/2001
EDN - Design Ideas / The circuit in Figure 1
serves as a variable, current-sink load for
testing voltage sources. You use digital
commands to set the load current of the device
under test over a wide range, independently of
the device under test's output voltage.
|
|
Variable Power Supply, 1 30 Volt@
1.5A: 1.2 volts to30
volts at1.5 amps |
|
Variable Voltage & Current Power
Supply:
|
|
Varying Brightness AC Lamp:
SCR is used to slowly vary the intensity of a120
volt light bulb by controlling the Time that the
AC line voltage is applied to the lamp during
each half cycle |
|
Voltage Inverter #2:
simple and inexpensive circuit can produce a
dual (positive and negative) voltage from a
single supply input, extremely useful for
powering OpAmp and other circuits that require a
dual voltage from a single battery
|
|
Voltage Reference improves JFET:
10/26/00 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit |
|
Voltage Regulator:
simple regulated12V power supply
using1-transistor regulator circuit
|
|
Voltage Regulator goes Digital:
11/24/99 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find the one of
interest / Power consumption and failing
batteries are key issues in battery-operated
applications. Features in the new generation of
series voltage regulators address these
concerns. For example, National Semiconductors
LP2951 MicroPower voltage regulator provides a
logic-level output signal indicating a low
regulated output voltage; the IC also has a
logic-level input to shut down the regulator to
conserve power. |
|
Wide-Range Programmable Negative
Regulator Conserves Power:
06/08/98 Electronic Design - Ideas for Design /
The circuit described here supplies 0 V to −40 V
for those applications that require a variable
programmable power supply, such as in automated
testing systems, battery-discharge-curve
simulation, and when driving heating elements to
various. . |
