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This is really fantastic circuit.Because you can fun with this circuit.If others operate your TV set or setup you can use this to control them.and you can use this to annoy someone.so enjoy with this.... Parts: Q1 2N4403 PNP Transistor Q2 2N4401 NPN Transistor C1 10nF Ceramic Disc Capacitor C2 1uF Electrolytic Capacitor D1, D2, D3 High Output IR LED R1 100K 1/4W Resistor R2 150K 1/4W Resistor R3 10K 1/4W Resistor R4 1K 1/4W Resistor S1 Normally Open Momentary Push Botton B1 4.5V Battery (Three "AA"'s In Series) MISC Wire, Case, Board Note # You may need to adjust the value of R5 for the right frequency. #supply 4.5v

This is so useful circuit for you. Because At present we have to face lots of difficulties because of not having some ICs such as ZN414 IC in the market.So we have designed this circuit to build that circuit easily. parts Q1 (b) 1.31V Q2 (b) 0.71V Q2 (c) 1.34V Q3 (b) 0.62V Q3 (c) 3.87V

This is so useful circuit for us Because If our caller is in hold on position we can allow them to listen a music.When you want to operate this circuit you can hold on your phone and switch on the S1. The RED wire from the phone jack is typically positive and the GREEN wire is negative or ground.

This circuit is so impotent circuit for the car owners.Most of time they have asked about a circuit like this (12v Fluorescent lamp)so you can attach a colorful fluorescent lamp like this for your vehicle. Parts: C1 100uf 25V Electrolytic Capacitor C2,C3 0.01uf 25V Ceramic Disc Capacitor Q1 IRF510 MOSFET U1 TLC555 Timer IC T1 6V 300mA Transformer LAMP 4W Fluorescent Lamp MISC Board, Wire, Heatsink For Q1 C4 0.01uf 1KV Ceramic Disc Capacitor R1 1K 1/4W Resistor R2 2.7K 1/4W Resistor note 1. Attach a heat sink for Q1 2. A 240V to 10V transformer will work better then the one in the parts list. The problem is that they are hard to find.

When you drive on the way most of time, you can see some drivers drive their vehicles with their powerful head lights.As a result of it we can't drive our vehicles because at that time we become blind,Some times it causes for various road accidents.So I have introduce a new circuit to switch your high beam to low beam automatically.when a vehicle comes in front of you automatically your head lights go to dim position. Parts: R1 5K 1/4W Resistor R2, R3, R4 5K Pot K1 Low Current 12V SPST Relay K2 High Current 12V SPDT Relay S1 SPST Switch B1 Car Battery MISC Case, wire, board, knobs for pots Q1 NPN Phototransistor Q2 2N3906 PNP Transistor Note 1.S1 can on and off the circuit. 2. B1 is, certainly, in the car already. 3. Connection A goes to the high beam circuit, B goes to the headlight switch common and C connects to the low beam circuit.

This is very useful circuit for all because you can record telephone conversations automatically.What you have to do is connecting this unit to the phone line,Recorders remote control jack and to your tape recorder's microphone input.when the voltage of the line drops 5v or less it automatically starts to record. Parts R2 1.5K 1/4 W Resistor R4 33K 1/4 W Resistor C1 0.22uF 150 Volt Capacitor R1 270K 1/4 W Resistor Q1, Q2 2N4954 NPN Transistor D1 1N645 Diode R3 68K 1/4 W Resistor MISC Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

We can see when we use torches we can't use it for long time but here I have mention a circuit. it shows the way of using a long life L.E.D torch.It gives 80 times longer service.Than normal Torch. Note # If you want to use different voltage you can do these modifications. # Change R3 values as follows, according to the power. 9V - 470 Ohm 12V - 560 Ohm

This is a long range transmitter.This circuit can send signals up to 2km.So that you have to use 1m copper wire.The power of this transmitter has been increased by usin two transistors. When you use this transmitter do give power with out connecting the antenna.Because it will burn your transistors. Note # The transformer T1 can be a general purpose audio driver transformer seen in transistor radios. # The inductor L1 can be made by making 56 turns of 365 WG enameled copper wire on a 1 cm former. # Inductor L2 can be a 10 mH general purpose radio frequency choke. # The circuit can be powered from a 9V PP3 battery.