Category: Hobby-Circuits

Working with SMD and SMT PCB

One thing tho, i would like to request you to send me some procedures on how to work with surface mount devices (more…)

This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The (more…)

This is a easy to build LED lamp circuit for Learning and building skills. This is the first draft schematic V 1.0. (more…)

This is a Constant Current Source LED Driver, When the LED driver Upper-NPN is driven by a voltage thru 4.7K the LED (more…)

This is a R-2R Digital to Analog Converter, It converts a byte (8 bit) to a analog value. It has 256 levels (more…)

This will monitor telephone status without loading the telephone line, this way if you have two phones in parallel you will know (more…)