By using dual bipolar devices in one case, the manufacturer nearly perfectly matches the two devices. Although this Design Idea describes a positive power supply, you can realize a similar ...

The circuit monitoring the positive rail replaces npn with pnp devices. Best results are obtained using inexpensive dual transistors and 1% resistors for setting Iref and for Re1 and Re2. Rsenseshould ...

This current-limiting circuit, shown in this example as part of a small bench power supply, could in principle be used in conjunction with any dual-rail current source. The part of the circuit to the ...

This compact dual power supply is intended for general use on an electronic workbench. It has few distinguishing features apart from being easy to make, compact and is constructed from readily ...

Follow these six steps to check the voltage, current, power, protection, and performance of your power supply circuit. Learn how to test a power supply circuit effectively using the right tools ...

Output voltage V OUT1 can be calculated using the following relationship: V OUT1 =1.25V (1+(VR2+VR3)/R7)). Output voltage V OUT2 is around 1.5V lower than V OUT1, and can consequently start from 0V..

The circuit design of this dual polarity power supply is regulated with the use of a positive (78xx) and negative (79xx) voltage regulators. What is the purpose of dual power supply? Dual polarity ...

In reality, constructing such a power supply is quite manageable when leveraging a thoughtful blend of established technologies. The bench supply circuit presented here from 2010 offers a practical ...

1. In the circuit for the 1 mA two-terminal current source, the leftmost PNP transistor (Q4) is a "bolt-on" to harvest the approximately 0 temperature-coefficient current in the left leg (a).

A low power power-on reset (POR) circuit with low temperature coefficient, low quiescent current and small area is proposed in this paper. The POR circuit samples the power supply voltage through a ...