Spy FM Transmitter circuit
on Nov 21, 2009 in Radio/RF/Wireless This is so impotent circuit for us,Because we can use this circuit as a spy unit.This circuit can transmit signals about 30m.And the other important thing is the power of this circuit we can operate this circuit with 1.5v to 3v(1.8 mA at 1.5 Volts )N...

Christmas star with 40 LEDs
on Nov 20, 2009 in Lights and L.E.Ds This is an ordinary LED circuit.Here you must be creative when you build this circuit.Really If you are creative you can make really really fantastic Christmas star.On the other hand you can use this for your Christmas tree even.Note# Use 6v for this...

Pulse Generator With NE 555
on Nov 19, 2009 in NE555 Most of time we have to use pulse generators.Here I have introduce a Pulse generator with NE555 IC.Normally we use this IC with lots of circuits.When you operate this circuit give 5v as the supply voltage because this IC works with that current But d...

Stereo VU Meter Circuit (Sound level displayer)
on Nov 18, 2009 in Audio We can use this sound level displayer circuit to improve the out look of your amplifier circuit or your Radio player.Actually this gives an unbelievable attraction for your amplifier set or radio set.There are ten LEDs, so It would be better....Note#...

1.25V to 25V To DC power supply
on Nov 17, 2009 in power supplies This is a DC power supply circuit.This circuit is based on LM317 Variable Regulator.This Regulator needs at least 28v(DC).Then it will out put 1.25v to 25v DC.So I suppose this would be an important circuit for you all.Note# 5K ohm Change If you want...

AUTO fast battery charger for cars
on Nov 16, 2009 in Cars This circuit is a fast and auto car charger circuit.By using this one you can charge your lead acid battery easily.After charging the battery this circuit will cut off the power to your battery. so this is very useful circuit for you.Note# use IC 780...

Power supply failure alarm circuit
on Nov 16, 2009 in power supplies This is very useful circuit for you.Because through this circuit we will be able to know about a power failure.Here We have done some modification,it's nothing but this circuit doesn't want an extra power supply for the alarm circuit.Because after th...

Relay Delay circuit
on Nov 15, 2009 in Cars This is a relay delay circuit.By using this circuit we can delay the function though circuit gave the signal.That means there is some time to operate the relay after the signal which gave form the circuit.here you can get 6 second delay.But if you wa...

9 second Visual Timer Circuit
on Nov 14, 2009 in Timer This is very useful circuit for you,Because you all can use this timer for various purposes.And the impotent thing of this circuit is giving a visual signal through LEDs.This is 9 second timer.This operates with 12v power.So you can use this one as a...

Speaker as a mic circuit
on Nov 12, 2009 in Audio This is wonderful circuit for you guys.because we can use a normal speaker instead of a mic.When the voice waves touch the speaker.Magnetic field is changed in it.As a result of that it releases small electric signal to the transistor and transistor...