Monthly Archives: September 2013


Useful for electronics hobbyists, this linear workbench power supply converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts). An adjustable three-pin voltage regulator chip LM317T (IC1) is used here … Continue reading

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Mobile Bug

This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and- a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. … Continue reading

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