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Power Supplies
Smart Power Supply for Microcontroller Projects Schematic Circuit Diagram
A good, reliable and easy to use dc power supply is probably the most important thing for every electronics hobbyists.…
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LCD-LED Display
Automatic Showerhead Light Schematic Circuit Diagram
I am a big fan of the LV version of the Pololu mini pushbutton power switch (2808) that has now…
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Amplifier Circuit Diagrams
Improved Hybrid HeadPhone Amplifier Schematic Circuit Diagram
Jeff Macaulay’s excellent single tube ECC82/ 12AU7 ‘Hybrid Headphone Amp’ (HHA) published in [1] spurred the author to implement some…
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Battery Charger
Lithium Battery Charger using BQ24103 Schematic Circuit Diagram
The BQ24013 is a simple-to-use charge controller suitable for use with lithium-ion and lithium-polymer batteries. A major advantage it has…
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Amplifier Circuit Diagrams
Preamplifier for RF Sweep Generator Schematic Circuit Diagram
The RF sweep frequency generator (‘wobbulator’) published in the October 2008 issue of Elektor has a receiver option that allows…
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555 timer ic
Lighting Governor Schematic Circuit Diagram
This circuit is very handy as a timer circuit for a lamp, for lighting a staircase, for example, but can…
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USB Circuit Diagrams
Simple USB AVR-ISP Compatible Programmer Schematic Circuit Diagram
Modern PCs rarely have a serial or parallel port any more, to the great regret of anyone who experiments with…
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Lights and Display Board Circuits
Remote Control Mains Switch Schematic Circuit Diagram
As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an…
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LCD-LED Display
USB Fuse Schematic Circuit Diagram
Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look…
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Battery Circuit Diagrams
Phantom Supply from Batteries Schematic Circuit Diagram
Professional (directional) microphones often require a phantom supply of 48 V. This is fed via the signal lines to the…
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