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Nano-Ampere Meter
This circuit can measure currents down into the nano-ampere range. It is useful when building, testing and experimenting with low-power circuits, especially those operating...
LASER-BASED INTRUDER ALARM
You can use this laser-based intruder alarm conveniently at the entrance of a hall or any other similar location to protect the same from...
Photovoltaic Battery Charge Controller
A charge controller is one of the main components of a solar battery charging system (Fig. 1). Its main function is to fully charge...
GUITAR EFFECT PEDAL POWER
A friend of mine plays guitar with several guitar effect pedals. He had a problem with battery eliminators and cables of the pedals cluttering...
ELECTRIC GUITAR PREAMPLIFIER
Here is the circuit of a guitar preamplifier that would accept any standard guitar pickup. It is also versatile in that it has two...
Standby Power-Loss Preventer
Electronic devices consume some power even in the standby mode, i.e., when they have been switched off using a remote handset but not the...
Smart Loop Burglar Alarm
Simple loop burglar alarms sound whenever the loop breaks. What if a clever thief comes to know of the working of this alarm? He...
MOBILE BUG
This handy, pocket-size mobile transmission detector (Mobile Bug) can sense the presence of an activated mobile phone from a distance of one and a-half...
DIY Electronic Horn Circuit
Here’s a simple circuit of an electronic horn that is built around quadruple op-amp IC LM3900 (IC1). IC LM3900 has four independent op-amps (A1...
Precision 1Hz clock Generator using Chip-On-Board
Usually the circuits for generation of 1Hz clock for applications in digital clock and counter circuits make use of ICs in conjunction with a...
