|
.4 watt 100% Radio Shack DC-DC Converter - This DC-DC converter
("inverter") needs nothing but unmodified Radio Shack parts. You don't need to
build or wind any coils or transformers…..... |
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+/-12V-> +/-5V Power Unit - This is the voltage converter to get the
voltage of ±5V from the input voltage of ±12V. I am using the 3 terminal voltage
regulator for the voltage to be changed in this unit. As the regulator, LM317 is
used for the positive voltage and LM337 is used for the negative voltage. The
output current can make output in 1 A..... |
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+30V Power Supply with +5V - I made power supply which makes about
+30V with +5V power supply. Direct current is changed into alternating
current by oscillator which used schmitt trigger inverter which has
hysteresis characteristic and resonance circuit. high DC voltage
(+50V) is made with alternating voltage using voltage amplification
rectification circuit. (app note added 4/05) [Designed by Seiichi Inoue] |
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+5V Power Supply Circuit - This circuit is a small +5V power supply,
which is useful when experimenting with digital electronics. Small inexpensive
wall tranformers with variable output voltage are available from any electronics
shop and supermarket. Those transformers are easily available, but [Tomi Engdahl's
design] |
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+9 Volt*and* 9 Volt from One Battery! - MAX1044 is a charge
pump converter it uses a capacitor as a "bucket" to pump charge from one place to
anor. It can be used to generate negative voltage easily. (added 4/02)
|
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µC controls charge pump as background task - 1-Aug-97 Issue of EDN
Because of power consumption and cost, designers of battery-powered devices mainly
choose components that run at 3V or lower. Unfortunately, many devices operate
only at 5V, including LCDs with built-in drivers, programming lines of many
EEPROMs and flash chips, and CMOS ADCs..... [Design Idea by Carlos Cossio,
Santander, Spain] |
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0.5v Negative Supply - Although not very efficient, this simple circuit,
consisting of two LEDs and a photo diode, generates a negative voltage with a
current level of a couple milliamps. It is ideal for supplying a negative
rail to low power “rail to rail” op amp circuits, which need to have a true zero
volts output. (added 12/04). …. [Designed by David A. Johnson] |
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0.5v to 6v Voltage Converter - Conventional silicon transistors just
can't operate at voltages less than about 0.7v. Old germanium transistors could be
used, but those are hard to find these days and most are rather large in size.
Some new n-channel MOSFET devices with very low gate-source threshold voltage can
operate at quite low voltages. I've been experimenting with various devices and
came up with one circuit (shown below), which demonstrates how to boost the low
voltage from a single solar cell to a higher voltage..... [Hobby Corner Circuit by
Dave Johnson] |
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0-10V Control for RC Servos - In this circuit NE555 is configured as
astable multivibrator. main timing capacitor (220 nF) is always changed to
voltage level which is determined by voltage on NE555 pin 5 (in this circuit
that voltage is aroun 1.6V). When timing capacitor is charged only with
current coming through 33 kohm resistor.....(added 4/05) |
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10 Khz VFC uses Charge Pump Variation - 04/09/98 EDN-Design Ideas.....A
diode-capacitor charge pump is the starting point for many
voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1 uses a
variation on that classic theme to achieve linearity less than 0.05%, micropower
operation of approximately 10-�A total draw from a 5 to 36V rail, and
bipolar-input capability.....several circuits included, scroll the find this
one..... [Design Idea by Stephen Woodward, University of North Carolina, Chapel
Hill, NC] |
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100ma UltraLow Noise Charge Pump LED Supply with Output Current Adjust -
Linear Technology LTC3201 (app note added 2/05) |
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10-15w watt 100% Radio Shack DC-DC Converter - This DC-DC converter
("inverter") needs nothing but unmodified Radio Shack parts. You don't need to
build or wind any coils or transformers.…..... |
|
12 Volt 30 Amp PSU - Using multiple power transistors to increase
current of 7812 IC voltage regulator (circuit added 11/06) |
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12 Volt to 9 Volt DC Converter - Car Converter for12 Volt to 9V…. [Tony
van Roon's circuit] |
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13 VDC to 120 VAC Inverter - Ever needed a low power 120volt AC
power source for your car, van or truck? Well this circuit should do the trick for
you. It will supply 15 watts of AC power to a device. It should power lamps,
shavers, small stereos and small appliances. If you draw to much power the circuit
will shut down all by itself. The output.....(electronic design added 6/07)
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13 VDC: 120 VAC Inverter Schematic - This Inverter takes 12 volt d.c
and steps it up to 120 volt a.c. The wattage depends on which transistors
you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for
T1. This inverter can be constructed to supply anywhere from 1 to 1000 (1
KW) watts.....(added 4/05) |
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14 Volt DC to 120 Volt AC Inverter (Aaron Cake) - Have you ever wanted
to run a TV, stereo or other appliance while on the road or camping? Well, this
inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC.
The wattage depends on which tansistors you use for Q1 and Q2, as well as how
"big" a transformer you use for T1. The inverter can be constructed to supply
anywhere from 1 to 1000 (1 KW) watts. (schematic / circuit added 4/02)
|
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2 ICs Convert 4 20mA Signal to 0 5V Output - Maxim Application Notes /
823 / Jul-09.....[App Note] |
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2 Watt Switching Power Supply - In this small switching power supply, a
Schmitt trigger oscillator is used to drive a switching transistor that supplies
current to a small inductor. Energy is stored in the inductor while the transistor
is on, and released into the load circuit when the transistor switches off. The
output voltage is dependent on the load resistance and is limited by a zener diode
that stops the oscillator when the voltage reaches about 14 volts. Higher or lower
voltages can be obtained by adjusting the voltage divider that feeds the zener
diode. The efficiency is about 80% using a high Q inductor..... [Bill Bowden's
website] |
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500kHz 6a Monolithic Boost Converter LT1370 - DN183 Design Notes
(Linear Technology) (app note added 1/06) |
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5V power supply teams low dropout regulator, charge pump - 8-Jan-04
Issue of EDN Auxiliary power of 3.3V is replacing the 5V auxiliary power
that "silver boxes" supply in most computer systems, but some circuits still
require a 5V supply. Such systems impose the messy task of creating a central 5V
auxiliary supply from the 3.3V auxiliary supply and then routing 5V power
throughout the motherboard..... [Design Idea by Jim Christensen, Maxim Integrated
Products, Sunnyvale, CA] |
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6 to 12 Volt Converter (Aaron Cake) - This circuit can provide up to
800mA of12V power from a 6 Volt supply. The circuit is simple, about 75% efficient
and quite useful...... |
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A 500kHz 6a Monolithic Boost Converter LT1370 - DN183 Design Notes
(Linear Technology) (app note added 1/06) |
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A doozy requiring some parts you can't get at the 'Shack. - You can make
a doozy of a xenon strobe using the 12 volt DC in,…..... |
|
AB-11/ PC Board Layout Checklist: DC-DC Converters - Fairchild
Application Notes / (app note added 6/06) |
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Active Shortwave Loop Antenna Loopifier? - .....(electronic design added
6/07) |
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An Output Adjustable Flyback Converter - A high voltage step-up DC power
supply using adjustable flyback conversion. [Simon Oh, designer] |
|
AN-1119: Voltage Doubler Design & Analysis - National Semiconductor
Application Note (app note added 2/06) |
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AN-347: Shielding & Guarding - AN-347 Analog Devices Application Note
(app note added 2/06) |
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AN-348: Avoiding Passive-Component Pitfalls - AN-348 Analog Devices
Application Note.....[App Note]The Wrong Passive Component Can Derail Even
Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.
|
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AN-349: Keys to Longer Life for CMOS - AN-349 Analog Devices Application
Notes (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
|
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AN-4137/ Design Guidelines for Off-line Flyback Converters using FPS -
Fairchild Application Notes / (app note added 6/06) |
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AN-4137SC/ Chinese Translation: Design Guidelines for Off-line Flyback Converters
using FPS - Fairchild Application Notes / (app note added 6/06)
|
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AN-4140/ Transformer Design Consideration for off-line Flyback Converters Using
Fairchild Power Switch FPStm - Fairchild Application Notes / (app note
added 6/06) |
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AN-4146/ Design Guidelines for Quasi-Resonant Converters Using FSCQ-series
Fairchild Power Switch FPStm - Fairchild Application Notes / (app note
added 6/06) |
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AN-4147/ Design Guidelines for RCD Snubber of Flyback - Fairchild
Application Notes / (app note added 6/06) |
|
AN-53/ Implementing an RC5051 DC-DC Converter on Pentium II Motherboards -
Fairchild Application Notes / (app note added 6/06) |
|
AN-703: Driving High Power LEDs - AN-703 Analog Devices Application Note
(app note added 2/06) |
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AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -
AN-772 Analog Devices Application Note (app note added 2/06) |
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Avoiding Passive-Component Pitfalls - AN-348 Analog Devices Application
Note.....[App Note]The Wrong Passive Component Can Derail Even Best Op Amp
or Data Converter. Here Are Some Basic Traps to Watch For. |
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Boost Controller Drives Buck Converter - 02/03/97 EDN-Design
Ideas.....By adding an external Switching Transistor, you can use a step up dc/dc
Converter to step down voltages to produce an efficient Battery Powered Power
Supply, this example Circuit can step down inputs as Low as2V to Outputs as Low
as1.25V, with efficiency as high as 80%..... [Design Idea by Michael Keagy, Maxim
Integrated Products, Sunnyvale, CA] |
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Boost converter works with wide-range negative-input supply - 18-Mar-04
Issue of EDN Assume that a design requires positive voltage, but only a
negative-voltage power source is available. Using a standard boost-converter IC in
the circuit of Figure 1, you can efficiently generate a positive voltage from a
negative source. The boost converter generates an output voltage that's higher
than the input voltage..... [Design Idea by Mike Wong, Intersil Corp, Milpitas,
CA] |
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Buck boost regulator suits battery operation - 4-Sep-03 Issue of EDN
A buck/boost converter can step a voltage up or down. Such a converter is
appropriate for battery-powered applications. One application derives a regulated
14.1V at 1A from 12V solar panels with 9 to 18V variation. In this type of battery
application, efficiency is an important factor; hence, this design uses an
inexpensive synchronous-rectifier-based MC33166/7 circuit..... [Design Idea by
Kahou Wong, On Semiconductor, Phoenix, AZ] |
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Buck converter charger also provides system power - 05/22/97 EDN-Design
Ideas.....Switching Regulator provides charge voltage setpoint with Current
regulation, and second Switching Regulator provides5V System Power -Many systems
require long-time operation during periods of power loss. Often, a gel or wet-cell
lead-acid battery is best choice because of high capacity and relatively low
cost. The battery charges..... [Design Idea by Robert Hanrahan, National
Semiconductor, Woodcliff Lake, NJ] |
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Buck converter handles battery-backup system - 24-Apr-03 Issue of EDN
A synchronous buck converter is inherently bidirectional. That is, it transfers
energy from input to output as a buck regulator when the output voltage is low,
but, when the output voltage is high, the converter acts as a boost regulator,
transferring power from output to input. This Design Idea shows how to use
this bidirectional energy transfer to automatically recharge a battery when the
mai..... [Design Idea by Haresh Patel, Linear Technology Corp, Milpitas, CA] |
|
Buck IC boosts battery-voltage for white LED - 24-Apr-03 Issue of EDN
White-light LEDs are finding their way into many markets that incandescent bulbs
once served. Flashlights are among the newer applications in which reliability,
ruggedness, and ability to control the power draw of the LEDs make these devices
attractive. With incandescent bulbs, the power management for the device is a
simple on-off switch..... [Design Idea by Robert Kollman, Texas Instruments,
Dallas, TX] |
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Buck/Boost Charge Pump Regulator Powers White LEDs from a Wide 1.6 Volt to 5.5
Volt Input - Maxim Application Note #1021 (app note added 5/08)
|
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Buck/Boost Reference Design - This reference design presents an
alternative to typical boost power regulator. A buck converter IC is used to
generate a higher voltage needed by white light LED power from a Ni-Cd
battery. This circuit operates by turning high switch on, connecting
battery voltage across inductor. Once sufficient energy is stored in
inductor,.....(added 3/05) |
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Buck-boost regulator suits battery operation - 09/04/03 EDN-Design
Ideas.....A buck/boost converter can step a voltage up or down. Such a converter
is appropriate for battery-powered applications. One application derives a
regulated 14.1V at 1A from 12V solar panels with 9 to 18V variation. In this type
of battery application, efficiency is an important factor; hence, this design uses
an inexpensive synchronous-rectifier-based MC33166/7 circuit..... [Design Idea by
Kahou Wong, On Semiconductor, Phoenix, AZ] |
|
Build a charge pump with ultralow quiescent current - 5-Aug-04 Issue of
EDN Portable battery-powered devices often spend most of their life in
standby mode, in which the quiescent current of an internal boost converter
continuously bleeds the battery. The quiescent current during standby can be
larger than the actual load current. Though several inductor-based converters
offer maximum quiescent current of less than 10 µA, designers usually prefer or
require a regu..... [Design Idea by Greg Sutterlin, Maxim Integrated Products,
Sunnyvale, CA] |
|
Build a transformerless 12V-to-180V dc/dc converter - 8-Jul-04 Issue of
EDN Some transducers for portable or automotive applications need accurately
regulated, high-voltage bias and draw little current. To produce such high
voltages from a low battery voltage, designers typically use switch-mode dc/dc
converters—generally, flyback converters. These converters exhibit high efficiency
at medium or high output power..... [Design Idea by Francis Rodes, ENSEIRB/IXL,
Talence, France] |
