Power Buffer Boosts Reference Current

A method of boosting the output current of a reference and also protecting against overloads is shown...

Backup Supply Activates By Drop-In Main Supply

A supply monitor using two TL7702A chips monitors the ± 15-V supplies and activates the back...

Transformerless Power Supply

By selecting capacitors, various voltages can be obtained from this supply. Notice that C2 through C7 must be ...

Switch-Selected Fixed-Voltage Power Supply

This supply can serve as a battery eliminator for various devices (such as tape recorders, small...

Step Variable Dc Supply

Intended as a replacement for generally poorly regulated "wall-type" ac/dc adapters, this circuit offers superior p...

Dual 50V/5A Universal Power Supply

Tl has two primaries and six secondaries; the two 120-VAC primaries and 6.3-VAC secondaries are i...

High-Voltage Pulse Supply

This high-voltage pulse supply will generate pulses up to 30 kV. Ql and Q2 form a multivibrator in conjunction wi...

Get Negative Rail With Cmos Gates

Using a charge pump and oscillator, this circuit uses a 7-kHz oscillator. When the clock is high, C and D...

Auxiliary Negative Dc Supply

In this circuit, IC1 (CD4009) is used as a square-wave oscillator at approx...

5 And 12V Ac Powered Switching Supply

This supply uses an SGS-Thomson UC3842 IC in an off-line flyback regulator, providing + 5 V at 4 A...

Positive And Negative Voltage Switching Supply

An LT1172 generates positive and negative voltages from a 5-V input. The LT1172 is configure...

Positive And Negative Voltage Power Supply

This circuit provides a precision voltage source that can be adjusted through zero to positive a...

Precise Low-Current Source

A current source that attains a resolution as low as 10 pA is useful in applications where a precise, low-value ...

Bridge Rectifier

This bridge circuit is intended for those cases where two unequal supply voltages are required. The lower voltage is obtai...

Negative Voltage From A Positive Supply

By using a 555 timer to generate a square wave and voltage-doubling the output, a negative voltage ...

3V Power Supply For Portable Radios

Most small portable radios require a 3-V supply, which is normally provided by two AA or AAA batteries...

Auxiliary Supply

Many power-factor-correction circuits use a boost converter to generate a regulated dc output voltage from the ac line inp...

Simple Lcd Display Power Supply

Laptop computers often use large-screen LCDs, which require a variable and a negative supply to ensure maxi...

15V And 5V Car Battery Supply

IC1 is a switching regulator that generates a 45-kHz signal that drives the gate of MOSFET Ql. Dl, D2, an...

Efficient Power Booster

This power booster functions as a high-efficiency "power multiplexer" or, if you supply an external signal-source, ...