Air Flow Detector

Here we have used an incandescent lamp as L1.When the bulb is getting heat the resistance will be increased.As air flows over the filament it cools down, thus lowering it's resistance.If you want to see the amount of air flow.You can use a meter for that..And I hope to give you HHO Technology so at that situation this circuit will be so usefull Still We do some test on it.

Parts:

C1 47uF Electrolytic Capacitor
R1 100 Ohm 1/4W Resistor
R2 470 Ohm 1/4W Resistor
R3 10k 1/4W Resistor
R4 100K 1/4W Resistor
R5 1K 1/4W Resistor
U1 78L05 Voltage Regulator
U2 LM339 Op Amp
L1 #47 Incandescent lamp with glass removed
D1 LED

Note

# You have to brake the lamp with out removing the filament

Automatic Headlight Brightness Switch Circuit

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.

Automobile turn signal circuit.

This is a circuit which can use as a sequential signal light in automobiles.so the vehicle owners can use this to modify their vehicles.

Notes.

# This circuit need 12v power so you can provide it from your vehicle

Battery charger using LM350

This is very useful circuit for the vehicle owners.Because most of time they have to bring their heavy 12v battery hear and there.now you dont want to do that.because you can build your own 12v charger

Notes

Use a 20 to 30 V / 3A DC power supply for powering the circuit.

This circuit is not possible for charging GEL type batteries as it draw large amounts of current.

Battery Charger Indicator Circuit

This is battery charger indicator circuit diagram.When the battery charges it shows by the LED this circuit can be used with 12V battery with charging current less than 1A.

Note

# Dont use this circuit for the batteries Which has more than 1A charging current
# Fix this circuit on a PCB

Car Burglar Alarm Circuit

This is a burglar alarm for cars.If some one opened the car door.The alarm will activate.Normally this circuit provides 5 second to open the door and close it but If somebody opened it more than that the alarm will activate.To turn the circuit on S1 should be closed.If you want to open the door more than 5 seconds.You can deactivate the alarm by using S2.Exit delay time can be adjusted by using R1 and C1.

Note

# This circuit operates with 9v power supply
# Be careful when you work with high amp batteries

Battery Charger Indicator Circuit

Most of you asked about a Battery Charger Indicator Circuit.This circuit indicates weather battery is charged or not.This circuit avoid the over charge of batteries purple LED will indicate the battery is charging.After charging purple LED is off.

Police siren

This circuit generate the sound of American police siren.We have used famous NE 555 IC for this.you can operate this circuit with DC 12v power.

AUTO fast battery charger for 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 7805 as power supply for this circuit
# LM311 control test volt battery.
# Use PCB To build your circuit.
# Be careful when you deal with 230v

Relay Delay circuit

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 want more you can do it changing the value of capacitor.If you use 470uf it will delay 20 seconds.

Note

# Use 12v to operate this circuit.
#If you use this circuit for your vehicle Please cover this circuit properly.

12V Flashing Lamp Circuit Diagram

This is good news for vehical lovers.This is 12V Flashing lamp circuit.Yuo can use this circuit for your vehical.Here I have used IC LM317T.

Note

# Build this on a PCB

# This circuit operates with 12V power supply.

Fluorescent lamp Flasher (12V)

This is 12V Fluorescent lamp flasher.I suppose this is an impotent circuit for the car owners.Because you can improve the outlook with this circuit.This circuit operates with 12V power supply.

Note

# Be careful when you check this circuit.Because this circuit releases AC.

# Build this circuit on a PCB and fix it inside a box.

Horn for cars

This is a car horn.You can fix this for your car to increase the attraction.this circuit releases dual 4-watt.If you want to change the frequency of this circuit change the value of c2 and c3.

Note

# If you can use 1W resistors and compatible parts for 12V.the life time of circuit will be increased.

# Fix on a PCB and cover it with a box.

Voltage Booster Circuit Diagrams

This is voltage booster circuit diagram.you can get 24V from 12V DC.Q1 and Q2 are D1616.If you are unable to find D1616 You can use 2N 3055,C2236,SL 100.

Note

# For high current (around 5A) games use 2N 3055 transistor or more powerful Darlington pairs for Q1 and Q2.

24V Flasher for Vehiclcles.

This is simple flasher circuit diagram.Here I have used common Transistor 2N3055.This transistor can drive up to 10A.B1 and B2 are 24V/25W.Changing the value of R1,R2,C1,C2 you can control the speed.

Note

# This circuit operates with 24V power supply

12V to DC 300V 55 mA

This circuit can generate 300v from 12V power supply.This circuit operates with common transistors 2N3055 and 2N1305.This circuit can provide 55mA current.you can get fun with this

Note

# Be careful when you operate this circuit

# Build this circuit on a PCB

12V to 6V/7.5V/9V converter

This is good news for vehicle lovers.Because most of you may think to convert 12V to 6V / 7.5V /9V .so this is the circuit to do that you can get 6V/7.5V and 9V from this circuit.Here I have used famous transistor 2N3055.This circuit can generate about 2A


Note

# fix this circuiit in a box

# Build this circuit on a PCB.