Circuits & Schematics - Supply

The core element of any electronic device is the power supply. Any instability or malfunction of the power supply causes the device to malfunction or demonstrate weird behavior. In some sensitive applications, we need a dual voltage-rail power ...

Replace your old 78xx voltage regulators with this much more efficient pin-compatible buck converter. Efficiency test. 7805 replacement. Input: 12 V. Max power: 11627 mW. Max efficiency: 93.2%. Efficiency test. 7805 original (L78S05CV). Input: 12 ...

There are times when you would like to flash a LED through a thick plastic case without wires. The circuit below performs this feat. It can be powered from a supply ranging from 3 V to 6 V. It draws about 300 µA of average current at 5 V. It ...

Disclaimer: Some parts of this circuit carry dangerous Mains voltage. If you are a beginner, seek guidance from experienced users. Dealing with the 110 V/220 V AC mains voltage and measuring the AC load parameters are regarded as a challenge for ...

A novel switch architecture caters to extended battery range coupled with robust protection and diagnostic strategies. For automotive control units, the smart output switches operating contactor coils, lamps, solenoids, PTC (positive temperature ...

One of my electronics interests is building radios, particularly those featured in older UK electronics magazines such as Practical Wireless, Everyday Electronics, Radio Constructor, and The Maplin Magazine. Most of those radios are designed to run ...

In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed. In other applications, the average current to the motor needs to be limited, so ...

Single-cell lithium-ion (Li-ion) chargers are widely used, yet many practical designs rely on highly integrated ICs that conceal their internal operation. The type of Li-ion charger outlined in this design is, somewhat surprisingly, not readily ...

This easy-to-build PWM source is a handy testing tool for hobbyists, technicians, engineers and other RC-based device developers. I work at a university where I’m charged with designing and developing all manner of circuits and systems for ...

Convert a 4-20 mA signal to 0-20 mA and deliver it to a grounded load with no additional power supply needed. Recently, EDN kindly published a design of mine for a micropower 4-20 to 0-20 mA current loop converter ( Ref. 1 ). Shortly thereafter, in ...