It is economical to use a battery eliminator but with frequent power failure in most developing countries, it becomes annoying to change over from battery eliminator to battery operation every time the electric supply fails. Thus, we had designed a simple battery changeover relay. A simple way to avoid the nuisance is by connecting the battery and power pack in parallel. But the advantage with such a system is that when the eliminator voltage falls, even slightly (say from 6V to 5V), though the performance of the set remains unaffected,…
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Simple Signal Injector Circuit
Here is a project of a Simple Signal Injector Circuit. Don’t think it’s just “another one”; see the advantages it offers over some other injectors: Commercial injectors working on 1.5V are rather large in size to be carried in a shirt pocket. You can carry this injector quite easily in a shirt pocket because the whole device can be assembled in a pencil cell holder. This circuit will give you a battery life of about two a single pencil cell. Most important of all, this injector will cost you at…
Read More9V DC to plus/minus 5V DC converter
Presented here is a simple circuit “9V DC to plus/minus 5V DC converter” that can convert a 9V battery to plus/minus 5V DC supply using LM7805 and ICL 7660. The operational amplifier requires a dual polarity power supply (+Ve and -Ve) because it has to swing on the output i.e. it does not swing into action during the negative cycle of signal if the negative source is not given. Thus, for the proper operation, we need a dual polarity power supply. Circuit Description of 9V DC to plus/minus 5V DC converter While…
Read MoreFuse Tube Light as Night Lamp
Fuse tube light is useless what we generally think. This concept can be proven wrong by this particular project. This electronic trick let you use your fuse tube light at night lamp. The circuit comprises a bridge rectifier and a starter where, starter is used to boost up the voltage and is connected to the fuse side of tube light as shown in figure. The mains voltage is direct rectified using bridge rectifier made for four general purpose diode. The output with starter is connected to tube light as shown…
Read MoreBattery Saver Circuit
“Dry cell is not rechargeable”, this is what people think. This concept can be proven wrong by this particular project ‘Dry cell charger‘. Now here is another electronics trick to make the concept of ‘Battery Saver’ come true. The project battery sever not only charges dry cell but also enhances battery life by saving energy. The project ‘Battery saver circuit’ is considered very useful project for those, who run their appliance solely based on dry cell. Circuit Description Batter Saver Circuit:- The circuit is so simple that anyone can understand,…
Read MoreSimple Touch Switch Using Two Transistor
The project shown here is of simple touch switch circuit using two transistor which is used to control various types of electrical appliances like electrical bulb, fan, door bell etc. The complete circuit is build around two general purpose transistors, a relay and a touch plate. The length of wire connected between touch plate and base of transistor T1 must be short as possible, where size of touch plate must not exceed the size of 1 rupee coin. Transistor T1 is used as signal amplifier where T2 is a relay…
Read More555 Timer IC Tester
NE555 Timer IC is very popular and one of the most commonly used components in electronics circuits. NE555 Timer IC is also called Ideal IC since it offers multiple features like multipurpose functionality, low power consumption, small size, and durability. When we work on a particular project and it doesn’t work the way we wanted, before the circuit we doubt whether the IC used, is working or not. More or less, blaming IC is reasonable since IC is the combination of many more components or IC itself is a combination…
Read MoreDry Cell Charger | Easy Electronic Projects
We all are fed with the fact that dry cell is not rechargeable and it has no use once it is discharged during use. And, people simply throw it away and buy a new one. Because of this, people are forced to invest quite a lot on battery. In order to overcome this problem, here we have presented a new project ‘Dry Cell Charger’, which has been tested and verified practically. Using the circuit dry cell charger one can charge dry cell 6 to 8 times which evidently contributes to…
Read MoreWoofer Tweeter Crossover
When using speakers, people must have faced quite a lot of problems due to failure of the speaker to produce smooth sound quality continuously. It is because speaker detects only identical frequency and does not give response to all frequency. Particular range of low frequencies is detected by the speaker and it ignores high frequencies. Woofer or tweeter is introduced as a solution to this issue. However, if the signal from amplifier is directly fed to woofer or tweeter, then it may not produce the actual sound. And, a crossover…
Read MoreCapacitor Tester cum Flasher
Capacitors are one of the basic components of any electronic project. Now, here we taught you, how to test capacitor whether is short, open or working. The simple circuit of the capacitor tester is built around two general-purpose NPN transistors. This circuit posted here is used to test capacitors up to 1000 µF. The capacitor to be tested is connected at points A and B as shown in the circuit diagram (positive terminal at point B where negative terminal at point A). Working of the circuit Capacitor Tester cum Flasher When…
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