Multiple Voltage Power Supply:  (electronic circuit added 4/05)

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)

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. Supply is tapped from different points of the power supply circuit for ...   (added 11/05)

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)

Self Switching Power Supply #2:  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, the output voltage increases by 1 volt. Thus, the output varies from 3.7V to 8.7V (taking into account 1.3-volt drop across diodes D1 and D2).  Another important feature of the supply is that it switches itself off when no load is connected across its output terminals. This is achieved with the help of transistors T1 and T2, diodes D1 and D2, and capacitor C2. When a load is connected at the output, potential ....   (added 10/04)

Small Variable Power Supply:  (electronic circuit added 10/05)

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)

Variable DC Power Supply:  Voltage range:0.7-24 Volt Current limiting range:50mA-2A (added 9/04)

Variable DC Power Supply #2:  based on versatile L200 voltage regulator, independent voltage (3-15V) and current (10mA-2A) limits (added 5/02)

Variable Dual Lab Power Supply:  can supply from +/-1.2V up to about +/-25V, will current limit at around 800mA (added 5/02)

Variable load tests Voltage sources:  07/19/01 EDN Design Ideas  /  (added 1/05)  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. The circuit comprises an AD558 DAC, IC1, which provides a reference voltage at Point A....

Variable Power Supply #2:  (electronic circuit added 4/05)

Variable Power Supply #3:  (electronic (schematic / circuit added 2/05)

Variable Power Supply 1- 30 Volt@ 1.5A:  This is a simple, but low-ripple powersupply, 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.  It is relatively easy to build and can be pretty cheap if you have some or all the required parts. (added 11/05)

Variable Regulator Output:  0 –28 volts at3 amps (added 4/02)

Variable Voltage / Current PS:  28V, 0 3A regulation (2N3055, TIP32, 2N3053, LM1458) (circuit added 11/06)

Variable Voltage and Current Power Supply:  (electronic (schematic / circuit added 4/02)

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 (added 4/02)