This very simple little development board was designed for carrying out tests on the 8-pin AVR microcontrollers from Atmel. Any 8-pin IC with power on pins 8 (+5 V) and 4 (0 V) can be used,... Read more
The circuit shown here is formed of nine inverting transistor amplifier stages connected in series with an LED connected between emitter and ground. The output of the final stage connected t... Read more
We’ve all been here: you operate the TV remote and nothing happens. Is the device broken or do you just need to renew the battery? Eyesight alone is no help for testing the operation of the... Read more
Ronja is the author’s dog, a beagle-mongrel, who seems increasingly often to need to be called to heel either with a shout or with a whistle. And so the idea came about for an electronic dog... Read more
The circuit described here is a chaotic version of a conventional phase shift oscillator. The nice thing about it is that it is simple and cheap. In addition, it operates from a single suppl... Read more
From what’s written on the cover of Bert van Dam’s book entitled “50 New Applications for PIC Microcontrollers” [1], some of you might think that the projects, which address programming 16/1... Read more
This circuit is a revised version of the Audio Limiter published in the 2002 Summer Circuits edition, which is intended to limit the (possibly excessive) dynamic range of the audio signal fr... Read more
The LED bicycle light that we described in the July/August 2009 edition of Elektor has proved very popular. The author was particularly struck by the basic design, but as always, there is ro... Read more
This circuit uses two comparators that are combined in what is called a window comparator, i.e. resistors R2, R5, and R10 determine a voltage window within which the voltage applied to the j... Read more
Here’s a dimmer that, besides being touch-controlled, also has a setting memory that enables it, for example, to turn the lighting on at the level you had set last time it was turned off. Th... Read more
