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Variable 3 to 24 Volt/3 Amp Power Supply - regulated power supply can be
adjusted from3 to25 volts and is current limited (added 5/02) |
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Variable DC Power Supply - This power supply is based on the LM317
Variable Regulator. The input of the regulator needs to be around 28 Volts DC and
it will output a DC voltage from 1.25vdc to 25 vdc. To adjust the output voltage
simply turn the 5k ohm pot. The regulator will supply 1.5 amps of current
Copyright 2000 [url=http://home.maine.rr.com/randylinscott/index.html]Randy
Linscott[/url].... |
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Variable DC Power Supply - A Variable DC Power Supply is one of the most
useful tools on the electronics hobbyist's workbench. This circuit is not an
absolute novelty, but it's simple, reliable, "rugged" and short-proof, featuring
variable voltage up to 24V and variable current limiting up to 2A. It's well
suited to supply the circuits shown in this website. ….(electronic schematic added
03/08) |
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Variable DC Power Supply (Andy Collinson) - based on versatile L200
voltage regulator, independent voltage (3-15V) and current (10mA-2A) limits (added
5/02) |
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Variable Dual Lab Power Supply - can supply from +/-1.2V up to about
+/-25V, will current limit at around 100%mA (added 5/02) |
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Variable Isolated AC Voltage Spans 0VAC To 280VAC - I designed and built
this circuit about 25 years ago. It came in handy for many projects that were
powered from 120 VAC, 240 VAC and 277 VAC. It provides complete isolation from the
power line. It uses two 1:1 isolation transformers that are wired in parallel for
the140vac range and in series for the 280vac range. The selector switch also
diverts power to the appropriate output socket to avoid mishaps in sending the
wrong voltage to the load. My home-built unit also included an AC volt and amp
meter to monitor the output. However, this circuit only indicates the AC power
connections. …. [Designed by David A. Johnson] |
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Variable Laboratory DC Power Supply - Voltage range: 0.7, 24V Current
limiting range: 50mA, 2A A Variable DC Power Supply is one of the most useful
tools on the electronics hobbyist's workbench. This circuit is not an
absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring
variable voltage up to 24V and variable current limiting up to 2A. Well suited to
supply the circuits shown in this website. You can adapt it to your own
requirements as explained in the notes below. ….(design added 11/08) |
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Variable load tests voltage sources - 19-Jul-01 Issue of EDN 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, independent- ly of the device under test's output voltage. The
circuit comprises an AD558 DAC, IC1, which provides a reference voltage at Point
A.... [Design Idea by Michele Frantisek, Brno, Czech Republic] |
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Variable Power Supply 1- 30 Volt@ 1.5A - This is a simple, but
low-ripple power supply, and an excellent project if you're starting out in
electronics. It will suit your needs for most of your bench testing and
prototype applications. The output is adjustable from 1.2 volts to about 30
volts. Maximum current is about 1.5 amps which is also sufficient for most
of your tinkering.... [Tony van Roon's circuit] |
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Variable Power Supply Using Fixed Regulator - This is a similar power
supply that I used to power my FM Transmitter. After suffering long problems with
mains hum, this design using a pi filtered C-L-C approach. This circuit
offers excellent ripple rejection. … [Circuit designed by David Celestin] |
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Variable PSU - A variable power supply with adjustable voltage and
current outputs made with the L200 regulator. … [Andy Collison] |
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Variable Regulator Output - 0 –28 volts at3 amps (added 4/02)
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Variable Voltage & Current Power Supply - Another method of using opamps
to regulate a power supply is shown below. The power transformer requires an
additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and
the negative voltage is also used to generate a reference voltage below ground so
that the output voltage can be adjusted all the way down to 0. Current limiting
is.... [Bill Bowden's website] |
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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.,....(added
05/06/07) |
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Variable Voltage Regulator (Ron J) - As Ron suggests, controlling the
output voltage from a regulator can be made variable in three ways....(electronic
design added 6/07) |
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Variable Voltage/ Current PS - This regulated power supply can be
adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be
increased to 3 amps or more by selecting a smaller current sense resistor (0.3
ohm). The 2N3055 and 2N3053 transistors should be mounted on suitable heat sinks
and the current sense resistor should be rated at 3 watts or more. …. 28V, 0 3A
regulation (2N3055, TIP32, 2N3053, LM1458)....(circuit added 11/06)
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Varying Brightness AC Lamp - In this circuit, an SCR is used to slowly
vary the intensity of a 120 volt light bulb by controlling the time that the AC
line voltage is applied to the lamp during each half cycle. The circuit is
directly connected to the AC power line and should be placed inside an enclosure
that will prevent direct contact with any of the components. To avoid electrical
shock, do not touch any part of the circuit while it is connected to the AC power
line. A 2K, 10 watt power resistor is used to drop the line voltage down to 9
volts DC. This resistor will dissipate.... [Bill Bowden's web site] |
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