A very simple temperature indicator circuit can be built by interconnecting a single transistor, a diode and a few other passive components. Using Transistor as a Heat Sensor As we know that all semiconductors have this “bad habit” of changing its basic characteristics in response to ambient temperature changes. Especially basic electronic components like transistors […]
Archives for 2011
Simple Hi Efficiency LED Torch Circuit
A simple LED torch circuit that would light up 3 white LEDs from a 6 volt supply and would make your battery last forever is described here. A useful voltage doubler circuit is incorporated here to make a highly efficient circuit using just a handful of components. Introduction Learn more how to build it. White […]
How to Build a Simple Egg Incubator Thermostat Circuit
An electronic incubator thermostat circuit shown in this article is not only simple to build but is also easy to set and acquire exact tripping points at various different set temperature levels. The setting may be completed through two discrete variable resistors. How Incubators Work An Incubator is a system where bird/reptile eggs are hatched […]
Transformerless Automatic Night Lamp Circuit
This transformerless solid-state automatic night lamp operates without using bulky transformer, and automatically switches ON some LEDs during night, and switches them OFF during day. In this post I have explained how to make a transformerless automatic darkness activated LED lamp circuit, using a couple of transistors and capacitive based power supply, eliminating the use […]
Automatic Bedroom Lamp Timer Circuit
A simple automatic bedroom lamp timer circuit has been described here to switch off your bedroom lamp after a fixed predetermined time. The use of the reliable 741 IC makes the circuit very easy to build and moreover very accurate. Introduction The circuit of an automatic bedroom lamp timer presented here is super easy to […]
Simple Car Burglar Alarm Circuit
Learn how to build a simple car burglar alarm circuit right in your home. The circuit is built around a few trivial components and yet proves to be totally fool proof with the security of car accessory to which it has been integrated. You certainly won’t like waking up just to see your car audio […]