Circuits & Schematics Supply - 9

It is common practice to use digital open-collector outputs for control units in industrial applications. Using these outputs, you can switch loads, such as relays, lamps, solenoids, and heaters. One possible problem inherent to this type of output ...

Sometimes, you may need to make a DC/DC converter with minor components that can handle small loads. In this article, we are going to make something like that. This DC/DC converter using transistor has only a few components and can handle small ...

Lighting LEDs from a single 1.5 V cell poses a problem because their forward voltages are higher than the cell’s. The simplest way to light the LED is to use a step-up dc/dc converter. This Design Idea offers a simple and reliable alternative ...

The standard boost converter in Figure 1 uses not only IC 1 , C 1 , L 1 , D 1 , and C 2 to generate a main 5 V output, but also additional small, low-cost components to provide two auxiliary supply rails of 10 and 5 V. These auxiliary outputs are ...

A rechargeable battery’s load should be disconnected at the point of complete discharge, to avoid a further (deep) discharge that can shorten its life or destroy it. Because a battery’s terminal voltage recovers when you disconnect the ...

It is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller. The circuit in Figure 1 allows you to generate 14 V pulses from a 5 V power supply. An adaptation of ...

This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the ...

Linear voltage regulators offer a simple method of producing a constant current by connecting a fixed resistor between the regulator's output and ground nodes. The regulator's constant output voltage produces a constant current through the ...

This project provides AC voltage zero-cross timing detection and a DC voltage after diode rectification with high accuracy. Possible applications for such circuits are AC motor controllers, AC lamp controllers, AC Dimmer Controllers, Home ...

You would normally use a series linear regulator or a dc/dc converter to obtain 3 V dc from a higher supply. However, when breadboarding a concept, you may be able to use a shunt regulator, especially if a series regulator of the correct voltage is ...