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Ups 5Volt Circuit – Circuit Schematic
Ups 5Volt Circuit
A 9-V wall adapter supplies Vm. IC2 contains a low-battery detector circuit that senses l7IN by means of R6 and R7. The detector output Cpin 7) drives an inver...
Inexpensive Isolation Transformer (Impromptu Setup) Circuit – Circuit Schematic
Inexpensive Isolation Transformer (Impromptu Setup) Circuit
Using two 12-V filament or power transformers, an impromptu isolation transformer can be made for low-power (under 50 W) use in testing or servicing. SOI is an...
Antique Radio Dc Filament Supply Circuit – Circuit Schematic
Antique Radio Dc Filament Supply Circuit
This dc supply is great for operating battery-powered antique radios, because it is designed to prevent harming the tube filaments. ...
Subwoofer Amplifier Power Supply Circuit – Circuit Schematic
Subwoofer Amplifier Power Supply Circuit
Although intended to power a 100-W low-frequency amplifier, this power supply should handle many mono or stereo amplifiers in the medium power range...
Laptop Computer Power Supply Circuit – Circuit Schematic
Laptop Computer Power Supply Circuit
A laptop computer supply that has 9-V output, crowbar overvoltage protection, and operates i`rom a 12-V supply is shown above. The supply voltage should be at ...
Adjustable 20V Supply Circuit – Circuit Schematic
Adjustable 20V Supply Circuit
This circuit, can deliver 3 A or more and a maximum dc voltage ol` a little over 20 V. It is designed around the readily available LM317T adjustable 3-terminal...
Voltage Doubler Supply Circuit – Circuit Schematic
Voltage Doubler Supply Circuit
The voltage doubler is built around a pair of diodes (Dl and D2) and a pair of capacitors (CI and C2) that are fed from, in this ease, a 12-V, ...
0 To 12V, 1A Variable Power Supply Circuit – Circuit Schematic
0 To 12V, 1A Variable Power Supply Circuit
This 0- to 12-Vdc variable power supply uses an IC voltage regulator and a heavy-duty transformer to provide a reliable dc power supply. Looking at the schemat...
13.8Vdc 2A Regulated Power Supply Circuit – Circuit Schematic
13.8Vdc 2A Regulated Power Supply Circuit
This regulated power supply consists of step-down transformer Tl, a full-wave rectifier bridge (D1 through D4), and a filtering regulator circuit made up of Cl...
Multivoltage Power Supply Circuit – Circuit Schematic
Multivoltage Power Supply Circuit
This dual-polarity, multivoltage power supply can be built for a very small investment. The circuit is built around 78XX and 79XX series i-A voltage regulators...
Inverting Power Supply Circuit – Circuit Schematic
Inverting Power Supply Circuit
This circuit will provide a negative dc voltage that is approximately equal to the positive input voltage at no load and about 3 V less at 10 mA load. -`~ is f...
Simple Negative Supply Circuit – Circuit Schematic
Simple Negative Supply Circuit
This dc negative-voltage generator based on the 555 produces a negative output voltage ...
Inductorless Power Supply Converter Circuit – Circuit Schematic
Inductorless Power Supply Converter Circuit
Using a 555 timer and voltage doubler, this circuit will supply >50mA at 20 Vdc. Tl and T2 act as power amplifiers to drive the voltage doubler....
Hv Power Supply With 9 To 15Vdc Input Circuit – Circuit Schematic
Hv Power Supply With 9 To 15Vdc Input Circuit
The combination Hartley oscillator/step-up transformer shown in A can generate significant negative high voltage, especially if the voltage output of the trans...
Configurable Power Supply Circuit – Circuit Schematic
Configurable Power Supply Circuit
The adjustable supply can easily be reconfigured by altering the value of V2 and beefing up some other components, as is necessary. The output voltage is given...
Single Ltc Power Supply Circuit – Circuit Schematic
Single Ltc Power Supply Circuit
One LTC 1149 synchronous switching regulator can deliver both 3.3- arid 5-V outputs. The design`s simplicity, low cost, and high efficiency make it a strong co...
5V From 4Aa Cells Circuit – Circuit Schematic
5V From 4Aa Cells Circuit
With this unique logic-power-converter design (see the figure), a switchable 3.6 or 5 V at 200 inA can be attained by using four AA cells. The supply incorpora...
Universal Laboratory Power Supply Circuit – Circuit Schematic
Universal Laboratory Power Supply Circuit
The value of the design lies in the use of IC1, an LM317HVK adjustable s.eries-pass voltage regulator, for broad-range performance remainder supplies voltage-s...
Tracking Double-Output Bipolar Supply Circuit – Circuit Schematic
Tracking Double-Output Bipolar Supply Circuit
This circuit is useful for a bench supply in the lab. Separate or tracking operation is possible. The regulators should be properly heatsinked....
Cold-Cathode Fluorescent-Lamp Power Supply Circuit – Circuit Schematic
Cold-Cathode Fluorescent-Lamp Power Supply Circuit
This circuit is a 92%-efficient power supply for colrl-cathode fluorescent lamps (CCFLs), which are used to backlight LCD in portable equipment. The efficiency...