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power supply circuit

Index 24

Xbox
360 Power Supply by Intec

Published:2013-3-22 1:59:00 Author:Ecco | Keyword: Xbox 360, Power Supply

In
the market there is an Xbox 360 power supply made ​​by Intec, which is designed
specifically for use suited with the Xbox 360. Novelty has several features that
are not available on the normal network Xbox 360 adapter. In particular, the
device has a built-in cooler that promises to reduce the operating temperature
of the platform, three LED-indicator, informing you of the state apparatus, and
the half-meter cable. Connected device is simple and requires no additional
configuration. Xbox 360 Power Supply from INTEC sold in the market not more than
U.S. $ 100 and comes with no wires connected to the outlet.   (View)

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Car
charger for Nicd Battery Packs

Published:2013-3-21 4:15:00 Author:Ecco | Keyword: Car charger , Nicd Battery
Packs

The
Car charger for Nicd Battery Packs circuit is very suitable for portable
charger, with a few components, allows you to build them in a small case. The
number of silicon diodes across the Car charger output is determined by the
voltage of the battery pack.Figure each diode at 0.7 volt. For example, a 10.9-
volt pack would require 10.9/0.7 = 15.57, or 16 diodes.   (View)

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Nicd
Charger Uses LEDs Constant Current

Published:2013-3-21 4:02:00 Author:Ecco | Keyword: Nicd Charger , LEDs ,
Constant Current

This
Nicd charger circuit diagram is another simple NiCd battery charger, and I think
its very interesting because uses LEDs to adjust the charging current. As
mentioned above, this Nicd charger circuit uses constant current LEDs to adjust
charging current. It makes use of LEDs that pass a constant current of about 15
-mA for an applied voltage range of 2-18 V.They can be paralleled to give any
multiple of 15 mA and they light up when current is flowing. The circuit will
charge a single cell at 15, 30 .or 45 mA or cells in series up to the rated
supply voltage limit (about 14 V).   (View)

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5V
to 15V Power Supply using 7805 IC Regulator

Published:2013-3-21 4:00:00 Author:Ecco | Keyword: 5V to 15V, Power Supply ,
IC Regulator

This
power supply based 7805 IC regulator, it can provides a regulated output voltage
of between 5 V to 15 VDC, it is adjusted and set by a preset resistor. Maximum
output current range of this power supply is 350 mA, its enough to supply
powered calculator, radio, or cassete player. An integrated circuit regulates
the output voltage and although this 7805 IC is generally applied to a
fixed-voltage of 5 Vdc supply it is for a variable output voltage.   (View)

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Precision
high voltage regulator

Published:2013-3-21 3:55:00 Author:Ecco | Keyword: high voltage regulator

This
is precision high voltage regulator circuit diagram based 3 terminal adjustable
regulator LM317L IC.The circuit require input voltage Vin ≥ 178V and can provide
output voltage ( V out) between 8 V to 160 V @ 25 mA current output.   (View)

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Simple
Split Rail Power Supply based LM380

Published:2013-3-21 3:50:00 Author:Ecco | Keyword: Simple Split Rail, Power
Supply

This
split power supply circuit uses the of the popular LM380 audio power amplifier
chip. The device is internally biased so that without having any input the
output is held midway between the supply rails. R1, that will be initially set
to mid-travel, is used to nullify any inbalance in the output. Regulation of
Vout depends upon the circuit feeding the LM380, but negative and positive
outputs will track accurately irrespective of input regulation and unbalanced
loads. The free air dissipation slightly more than 1 watt, and so will require
extra cooling. The device is fully protected and will shut-down if its rated
dissipation is exceeded. Current limiting occurs when the output current is
higher than 1.3 A. The split power supply input voltage should never exceed 20
V.   (View)

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Fast
Response Power Supply Protection

Published:2013-3-20 1:57:00 Author:Ecco | Keyword: Fast Response, Power
Supply Protection

This
Fast response power supply protection circuit is used to protect regulated power
supply from the risks of undervoltage and overvoltage condition. When working
with a regulated power supply to reduce a supply voltage, there’s always the
risk that component failure in the power supply may cause a severe overvoltage
condition through the load. To deal with overvoltage conditions, the Fast
response power supply protection circuit is designed to protect the load
underovervoltage conditions. Component values given are for a 20 V supply with
regulated output at 12V. The zener diode can be changed-according to any voltage
is to be the maximum. When the voltage at the regulator output goes up to 13 V
or higher, the zener diode breaks down-and triggers-the thyristor which will
shorts out the supply line and blows the main fuse.   (View)

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Variable
Power Supply with Adjustable Current Limit

Published:2013-3-20 1:54:00 Author:Ecco | Keyword: Variable Power Supply ,
Adjustable Current Limit

This
circuit variable power supply with adjustable current limit using three terminal
adjustable regulator LM117 which is used to regulate current and the voltage
limits. Variable power supply input range is between 32 V to 40 VDC and can
provide outputs up to 25 VDC and provide currents up to 1.2 A Dioda D2 and D3
and Q2 are added to allow adjustment of output voltage to 0 volts. D1 protect
both LM117 during an input short circuit   (View)

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Lead
Acid Battery Charger with Current Limit

Published:2013-3-20 1:53:00 Author:Ecco | Keyword: Lead Acid, Battery Charger
, Current Limit

The
Lead Acid battery charger is based at charging voltage 2.4 V per cell, according
to many manufacturers recommendations’. Pulse circuit the battery under charge
with 14.4 V (6 CEUs x2.4 V per cell) at 120 Hz. This Lead Acid battery charger
design provides current limiting to protect the internal components battery
charger circuit while limiting the charging rate to prevent severe damage to
discharged lead-acid batteries. The recommended maximum charging time is
typically about a quarter of the value of ampere-hour battery. For example, the
maximum battery charging current to an average of 44 ampere-hour is 11 A. If the
impedance of the load requires a larger charging current of 11 A current limit,
the circuit will go into current limit. The amplitude of the charging pulse is
controlled to maintain maximum peak charging current of 11 A (8 on average A).
(View)

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Adjustable
Output Regulator with Op-Amp

Published:2013-3-20 1:52:00 Author:Ecco | Keyword: Adjustable , Output
Regulator , Op-Amp

With
adjustable voltage regulator the circuit voltage can be obtained varies from 7
to 20 VDC. This circuit requires a voltage input> = 20VDC Circuit NotesThe
addition of an op amp MC1741 allows adjustment to higher or intermediate values
while retaining regulation characteristics. The minimum voltage obtainable with
this arrangement is 2.0 volts higher than the regulator voltage.   (View)

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Universal
Power Supply Module 3V-30V

Published:2013-3-20 1:51:00 Author:Ecco | Keyword: Universal , Power Supply
Module , 3V-30V

This
universal power supply circuit provides a variable voltage between 3-30 V. The
power supply provides maximum current 1.5 A and with a few modifications and
additions to modules can provide a higher current. Adjustable regulator LM317
(U1) offers short-circuit protection and automatic current limiting at 1.5A. The
input voltage to the regulator is supplied by DB1, a 4 A 100 PIV full-wave
bridge rectifier. Capacitor C1 gives initial filtering. U1 provides extra
electronic filtering included in the regulating function. The output level of
the regulator is set by trim-pot R1. To prevent high-frequency oscillation
Bypass capacitor added to the input and output of U1 . The current output of the
transformer should be no less than 1.8 times the rated continuous-duty output of
the supply. Which means that a 1.5-A supply should apply a 2.7-A transformer.
For light or intermittent loads, a smaller 2.0-A transformer should be enough.
Wiring a 2nd Adjustable regulator LM317, U2, in parallel with U1 can be a quick
and clean method to increase the current limiting threshold of the universal
power supply to 3 A without having to sacrifice short-circuit protection. When
more than 3 A is needed, the regulator module may be used to drive the base of
one or more pass-transistors (see Fig. B).   (View)

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Current
Source / Regulator

Published:2013-3-20 1:50:00 Author:Ecco | Keyword: Current Source,
Regulator

The
Current Source/Regulator circuit powers the load through the regulator’s input
rather than its output. Since the regulator’s output sees constant dummy load
R1, it attempts to consume a constant amount of current, regardless of what the
voltage across the actual load really is. Therefore, the regulator’s input works
as a constant current source for the actual load. Thecurrent source circuit need
power supply with any of the commonly available ± 15 or ± 12V . The voltage
dropped over the regulator and dummy load lowered the total compliance voltage
of the Current Source/ Regulator circuit. You set the load’s current with R1.
The current equals 1.25 AAA x R.   (View)

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Low
Power 5V Switching Regulator

Published:2013-3-20 1:39:00 Author:Ecco | Keyword: Low Power, 5V , Switching
Regulator

This
simple switching regulator circuit have 5 V output, the input provide by a 9 V
battery. Ithaving 80% efficiency and 50mA output capability. How simple
switching Regulator works:While Q1 is actually on, its collector voltage
increases, delivering current through the inductor. The output voltage goes up,
triggering A1′s(precision op amp LT1013) output to rise. Q1 cuts off as well as
the output decays through the load. The 100pF capacitor would ensure clean
switching. The cycle repeats when the output falls low enough for A1 to turn on
Transistor Q1. The 1µF capacitor ensures low battery impedance at high
frequencies, preventing sag during switching.   (View)

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Power
Supply Splitter 9V to ± 5V

Published:2013-3-20 1:38:00 Author:Ecco | Keyword: Power Supply Splitter, 9V
to ± 5V

This
power supply splitter circuit can divide the voltage of ± 5V only from a 9V
battery. This circuit consists of three ICs. The first is IC ICL7660, these are
monolithic, CMOS switched-capacitor voltage converters that invert, double,
divide, or multiply a positive input voltage. Next is ICL7663 IC a positive
voltage regulator. And the last ICL7664 for negative voltage regulator. The
oscillation frequency of the ICL7660 will be reduced with the external
oscillator capacitor, so that it inverts the battery voltage more efficiently.
(View)

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Dual
polarity 15V power supply

Published:2013-3-20 1:37:00 Author:Ecco | Keyword: Dual polarity, 15V power
supply

This
simple split / dual polarity unregulated power supply circuit provides a +15
Volt and -15 Volt supply from a single transformer winding and one full-wave
bridge. A couple of zener diodes in series give you the voltage division and
their centerpoint is grounded. (The filter capacitor should not be seated
through its case). Since this power supply is unregulated type, so it will not
recommended for high quality audio system.   (View)

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12V
battery charger Max : 20 A rms

Published:2013-3-20 1:35:00 Author:Ecco | Keyword: 12V battery charger , 20 A
rms

This
12V battery charger circuitcan charge12 voltbatteries withmaximumcurrent20 Arms.
(View)

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Electronic
crowbar for AC and DC lines

Published:2013-3-20 1:34:00 Author:Ecco | Keyword: Electronic crowbar , AC
and DC lines

For
positive protection of electrical or electronic equipment, use this against
excessive supply voltage. Because of incorrect switching, electrical wiring,
short circuits, or failure of regulators, an electronic crow-bar circuit can
quickly place a short circuit through the power lines, thereby decreasing the
voltage across the protected device to close to zero and blowing a fuse. The
triac and SBS both are bilateral components, the circuit will be equally useful
on alternating current or direct current supply lines. Using the values shown
for R1, R2, and R3, the crow-bar operating stage can be altered over the range
of 60 to 120 volts dc or 42 to 84 volts ac. The resistor values may be changed
to cover a different range of supply voltages. The voltage rating of the triac
should be greater than the highest operating-point as set by R2. I1 is a low
power incandescent bulb with a voltage rating similar to the supply voltage. It
may be used to check the set point and operation of the unit by opening the test
switch and adjusting the input or set point to fire the SBS.   (View)

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Constant
Voltage Current Limited Charger

Published:2013-3-20 1:32:00 Author:Ecco | Keyword: Constant Voltage, Current
Limited , Charger

This
12v lead acid battery charger circuit based Regulator IC LM723C. The lead acid
battery charger circuit can provide 12 V output voltage at 0.42 A maximum
current. This battery charger circuit is design for 12 V Lead Acid battery.
(View)

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Thermally
Controlled Nicad Charger

Published:2013-3-20 1:31:00 Author:Ecco | Keyword: Thermally Controlled ,
Nicad Charger

One
method to charge Nikel Cadmium (NiCad) batteries quickly with out abuse is
generally to measure battery cell temperature and taper the charge accordingly.
This nicad charger circuit works with a thermocouple for this function. Another
thermocouple nulls out the effects of ambient temperature. The temperature
difference between both thermocouples can determine the voltage, which will
appears at the amplifier’s positive input. Since battery temperature rises, this
small negative voltage (1 °C difference between the thermocouples equals 40 µV)
gets larger. The amplifier, working at a gain of 4300, gradually reduces the
current over the nicad battery to keep its inputs at balance. The nicad battery
charges at a high rate until heating occurs and the circuit then tapers the
charge. The values given in the circuit limit the battery-surface temperature
rise over ambient to about 5°C.   (View)

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Nicad
Battery Zapper

Published:2013-3-20 1:30:00 Author:Ecco | Keyword: Nicad Battery Zapper

This
Nicad Battery zapper circuit clears internal shorts in nickel-cadmium batteries
by burning them away.   (View)

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