Circuit Lake

If you want to learn Reverse Engineering you can use photoshop as aid tools. For example, This 12-keys keypad failed after years of daily use. No schematic or replacement parts from the original manufacturer. The only option was to replace it with an off-the-shelf telephone-style keyboard.Following the maze of each and every PCB track in a circuit is boring and error-prone, so here is the easier way to get the job done. (more…)

This is a simple and low cost desktop headphone amplifier for the office. The amplifier concept is simple and follows a typical single-ended class A circuit utilizing an active constant current source (CCS) in place of a passive resistor. A CCS doubles the efficiency of the circuit over that where a passive load resistor is used, bringing it to a maximum of 25%. (more…)

It is a universal lithium ion battery with a battery charger intelligent interface based on a microcontroller Atmel ATmega8 using GCC worm. 3.2. The rate settings are established using one of three methods: a Smart car if the battery is detected, the battery settings are used. If the "Custom" is selected then the settings are using on-board DIP and variable resistance. If not, pre-sets of parameters are selected on the basis of other positions DIP

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This is a mini inexpensive AVR Digital Voltmeter Project with three digit display. It has also general purpose digital IO pins. So, you could use it as well to read a digital sensor and display the value.

The project can be freely programmed, calibrated and even be programmed with a non linear formula. It’s a display where you can define the relation between the measured value and the displayed number.

Interesting to build it ?
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