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Peak Level Monitor
Measurement of peak level is useful while testing an amplifier or a similar device. It is handy while testing a logic circuit, as it can pick up a high transient pulse (or show that there is none) and measure an output that is swinging strongly in both directions.
Mobile Bug, Mobile signal detector
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. It is also useful for detecting the use of mobile phone for spying and unauthorised video transmission.
Motion Sensor for Security Light
Here is a system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting in power-saving mode. The working of the circuit is simple. When you power-on the circuit after assembling all the components including the CFL, the CFL will glow for 10 seconds, turn off for 30 seconds, glow for 10 seconds and then turn off. Now the circuit is ready to work.
Happy New Year 2012
Mobile Phone Charger Circuit without Transformer
Found this cool circuits on the web. It is very simple to design by using new parts or components or reusing olds components which you have. This circuits generates 3 V DC supply form an Alternating 220 V electricity. I haven't tested it on my lab but I hope this ciruts works well.
DIY PIC16F883 Development Board
This is a pretty minimalistic dev-board for PICs that has a LM1117 linear power regulator for 3.3V or 5V choice, PIC16F883 with 7kb FLASH memory and a few pin headers on the other side. All I/O pins of MCU are accessible on those pin headers and there is also an ICSP port for PIC programming.
Solar Mobile Phone Charger Circuit
This little gadget uses a small 3 volt solar cell to charge a 6 volt NiCad battery pack which, in turn, may be used to charge many models of cell phones and other portable devices. The circuit "scavenges" energy from the solar cell by keeping it loaded near 1.5 volts (maximum energy transfer value) and trickle charges the internal battery pack with current pulses.
LED Torch
A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance, consumes around 2 Watts. The LED Torch in Fig. 1 consumes just 24 mW, giving it more than 80 times longer service from 4 AA alkaline batteries (that is, up to one month's continuous service). Although the torchs light output is modest, it is nonetheless quite sufficient to illuminate a pathway for walking.
Christmas Tree (or other plant) Moisture Monitor
Originally intended to monitor the moisture in a potted plant, this moisture monitor really shines as a Christmas tree stand water level monitor! A fresh Christmas tree drinks water an annoying rate and bending down under the decoration-laden branches to check the water level is a pain in the neck (or back). But if the tree isn't kept moist, it will cease to take up water and quickly dry out.
500W low cost 12V to 220V inverter
Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.
Low Cost Universal Battery Charger Schematic
Even though today’s electrical appliances are increasingly often self-powered, especially the portable ones you carry around when camping or holidaying in summer, you do still sometimes need a source of 230 V AC - and while we’re about it, why not at a frequency close to that of the mains? As long as the power required from such a source remains relatively low - here we’ve chosen 30 VA - it’s very easy to build an inverter with simple, cheap components that many electronics hobbyists may even already have.
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