Month: October 2010

Below is “make a portable spy scope” video tutorial. This video explained us about how to capture an image in long distance. If your camera zoom is not big enough, this is the solution. What we need only a cellphone (have camera feature), binocular, 2 tripods, binocular holder, and belt clip. To assemble the device, put the binocular into the […]

A laser beam is a interesting stuff that can be used in many project. One of the project is a simple laser communicator that is used to transmit the voice across the room. To build a simple laser communicator, we need audio output transformer, solar cell, small amplifier, radio battery pack and regular laser pointer. First, build the battery packet. […]

The video below explains us about the load sharing issues in SMPS (switched mode power supply) design. This video tell us that load sharing connects the load with more Power Supply together to empower the load. Usually there more modules with more total power capability that required by the system. If one power module failed, remaining module continue to supply […]

Mini electronic devices require multiple supply voltages to protect their circuitry. If this  supply voltage are improperly applied, it can resulting distracted process where internal conduction junction become biased, resulting an uncontrolled current flow. There are 4 methods of Power Supply sequencing. There are simultaneous, sequential, ratio metric and offset. We have to chose the method that meets system requirement.

This is EMI Filtering video. This video explained us about EMI Filtering, EMI Filtering Element, and EMI Filtering Leakage Currents. In this video, conducted mode RFI limit is illustrated on the diagram. On that diagram, the RFI has fix bandwidth. It’s claimed 9 KHz wide when scanning from 150KHz to 30MH and turning 20H when scanning below 150KHz. EMI filtering […]