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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students &
inventors:
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High Current Power Supply - Since my page was first posted, I
have received a number of emails asking about a high current power
supply. I looked around, but couldn't find one that was suitable. So, I
designed this.….(electronic schematic added 11/08) |
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High Current Power Supply - Since my page was first posted, I
have received a number of emails asking about a high current power
supply. I looked around, but couldn't find one that was suitable. So, I
designed this. It is a linear supply,.... [Aaron Cake] |
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High Current Regulated Power 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.... [Bill Bowden's circuit] |
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High Current Regulated Supply - Current of LM317 voltage is
increased by using an additional power transistors. ….(electronic
schematic added 11/08) |
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High-current supply uses standard three terminal regulator - 22-Jul-04
Issue of EDN Voltage-regulator design for high output currents can be a
critical and difficult task. Although voltage regulators with 1A maximum output
current are simple to design, thanks to 78xx three-terminal voltage regulators, at
output currents higher than 1A output, problems arise. For high output currents,
voltage regulators usually use parallel-connected power transistors.... [Design
Idea by I Hakki Cavdar, Karadeniz Technical University, Trabzon, Turkey] |
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Lantern Flasher/Dimmer (techlib) - The electronic lantern control
circuit (fig. 1) adds high-efficiency dimming and flashing to an existing
battery-powered lantern or flashlight or to a custom design. For the car it makes
a great lamp for changing a flat tire, back seat reading or emergency engine work.
The flasher mode is useful for warning other drivers....(circuit / schematic
design added 6/06) |
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Lantern Flasher/Dimmer (tomzi.geo) - Basically a high-efficiency dimmer,
but can also be used as a flasher. In dimmer mode, the LM358 (dual op-amp) is
wired to send pulses at a constant frequency. By adjusting the width of these
pulses, brightness of the bulb is controlled. In flasher mode, the same
potentiometer....(circuit / schematic added 2/03) |
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LM317 Regulator with Pass Transistor - The LM317T output current can be
increased by using an additional power transistor to share a portion of the total
current. The amount of current sharing is established with a resistor placed in
series with the 317 input and a resistor placed in series with the emitter of the
pass transistor. In the figure below, the pass transistor will start conducting
when the LM317 current reaches about 1 amp, due to the voltage drop across the 0.7
ohm resistor.... [Bill Bowden] |
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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....(added 10/05)
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LM317 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.... [Bill Bowden
design this one] |
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Low Voltage High Current Time Delay Circuit - .... |
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Multiple Voltage Power Supply - (electronic circuit added 4/05)
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National Semiconductor Dual High-Current Power Supply Kit - The National
Semiconductor Power Supply Kit is designed around the National LM2636, a
synchronous buck regulator. It provides over 28 amps of current with variable
output voltages ranging from +1.3V to +3.3V. (added 3/05) |
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Over/Under Voltage Cut-Out - This over/under voltage cut-out will save
your costly electrical and electronic appliances from the adverse effects of very
high and very low mains voltages. The circuit features auto reset and utilises
easily available components. It makes use of the comparators available inside 555
timer ICs(added 11/05) |
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Power Supply (PSU 3) - Electroinic circuit design…. [from Harry
Lythall's website] |
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Self switching Power Supply - One of the main features of the regulated
power supply circuit being presented is that though fixed-voltage regulator LM7805
is used in the circuit, its output voltage is variable. This is achieved by
connecting a potentiometer between common terminal of regulator IC and ground. For
every 100-ohm increment in the in-circuit value of the resistance of potentiometer
VR1,(added 10/05) |
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Small Variable power Supply - Features: 1.3-12.2 V, 1 A, over-current
protection. This is a simple but reliable device based one of the oldest
integrated voltage regulators of them all - the LM723…. [Aaron Cake's design] |
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