Anti Theft Security For Car Audios

This small circuit, based on popular CMOS NAND chip CD4093, can be effectively used for protecting your expensive car audio system against theft. When 12V DC from the car battery is applied to the gadget (as indicated by LED1) through switch S1, the circuit goes into standby mode. LED inside optocoupler IC1 is lit as its cathode terminal is grounded via the car audio (amplifier) body. As a result, the output at pin 3 of gate N1 goes low and disables the rest of the circuit.

Whenever an attempt is made to remove the car audio from its mounting by cutting its connecting wires, the optocoupler immediately turns off, as its LED cathode terminal is hanging. As a result, the oscillator circuit built around gates N2 and N3 is enabled and it controls the ‘on’/‘off’ timings of the relay via transistor T2. (Relay contacts can be used to energise an emergency beeper, indicator, car horns, etc, as desired.)

Anti-Theft Security For Car Audios Circuit diagram:

Different values of capacitor C2 give different ‘on’/‘off’ timings for relay RL1 to be ‘on’/‘off’. With 100µF we get approximately 5 seconds as ‘on’ and 5 seconds as ‘off’ time. Gate N4, with its associated components, forms a self-testing circuit. Normally, both of its inputs are in ‘high’ state. However, when one switches off the ignition key, the supply to the car audio is also disconnected.

Thus the output of gate N4 jumps to a ‘high’ state and it provides a differentiated short pulse to forward bias transistor T1 for a short duration. (The combination of capacitor C1 and resistor R5 acts as the differentiating circuit.)As a result, buzzer in the collector terminal of T1 beeps for a short duration to announce that to announce that the security circuit is intact. This ‘on’ period of buzzer can be varied by changing the values of capacitor C1 and/or resistor R5. After construction, fix the LED and buzzer in dashboard as per your requirement and hide switch S1 in a suitable location. Then connect lead A to the body of car stereo (not to the body of vehicle) and lead B to its positive lead terminal. Take power supply for the circuit from the car battery directly.

Caution.

• This design is meant for car audios with negative ground only.

Author:T.K  Hareendran Copyright: Circuit Ideas

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2 X 40 Watt STK amplifier

Components of the above is one component of ic which is applied as a reinforcement. Power amplifier used in an audio signal in order to become more powerful and can be heard via a tool that is the speaker. But in each set must have a voice amplifier, voltage, power quality is different.
For the IC has the output power above 2 X 40 Watt with 8 Ohm output impedance. Supply voltage ranging from 18 Volt to 32 Volt.

Part List

Resistor

R1_____1K

R2_____1K

R3_____22K

R4_____22K

R5_____1K2

R6_____100K

R7_____560R

R8_____1K

R9_____1K

R10____470R

R11____4R7

R12____3K3

R13____3K3

R14____4R7

R15____470R

R16____100R

R17____100K

R18____1K2

Capacitor

C1_____470pF

C2_____470pF
C3_____4u7F
C4_____4u7F
C5_____82pF
C6_____82pF
C7_____47uF
C8_____100uF
C9_____10nF
C10____39pF
C11____100nF

C12____47uF

C13____47uF

C14____100nF

C15____39pF
C16____10nF
C17____100uF
C18____47uF

Intregated Circuit

U1_____STK4773 , STK4793 , STK4803 , STK4813 , 4833 , 4843 , 4853 , 4863 , 4873 , 4893 , 4913.

On every IC that I mentioned has a different power output.

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Adjustable 0 30V 2A Laboratory DC Power Supply circuits

Adjustable 0-30V 2A Laboratory DC Power Supply

  

 PCB of Cheap adjustable 0-30V 2A Laboratory DC Power Supply

This 0-30V power supply is the variable voltage Regulator at 2A max, by used IC-723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 2amp.
It suitable for general electronics work shop. Because it is a simple circuit and easy circuit. In addition to this has the over current protection as well.
This circuit is designed using LM723 voltage regulators IC –DIP 20pin maintain a constant voltage, and a power transistor as the way through the current to can be used up as wanted.
The circuit was designed also with overload protection or short circuit in the output. The amount of current flow will not exceed the set. Because it is monitored constantly by R4.
When the current flows through the R4, until the 0.6V voltage drop across it. Making Q3 runs short the bias voltage between the base-emitter of Q2, it stopped working. Now, the Q1 stop working because does not has the bias voltage to base pin its, The output voltage is zero or down quite a close to zero.
The potentiometer VR1 acts as adjust the voltage that enter to the LM723 for the volt output by you want. By the our circuit can adjust the voltage output from 0V to 30V.
In use real, because the properties of the transistors used and values error of each device. Therefore, if the circuit can not be supply up to 2 A. Try changing the value of R4 is a lower value, until has the maximum current desired. Should be to use transformer 3A. The Transistor to Hold Heat sink as well.

 

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L200 Variable Power Supply Circuit

 L200 voltage regulator, this power supply has independent voltage and current limits. The mains transformer has a 12volt,2 amp rated secondary, the primary winding should equal the electricity supply. The 10k control is adjusts voltage output from about 3 to 15 volts, and the 47 ohm control is the current limit. This is 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero.

 

Power Supply Circuit.

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iPod 359 Degree Rotating Lamp

You can see it is designed from the iPod prototype, its control buttons turn into a Led form in the light, which can be rotated 359 degrees and flexible to illuminate all directions, it is a very interesting form.

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Woundplast MP3 Where To Paste You Like And The Body Power

Scientist invent the woundplast MP3 that can work without battery. The MP3 does not need caught in the collar or pocket, as long as pasting your skin can play beautiful music.
It can not help but think of O+ Music Campaign, in such event, songs can be played on different media in promotional equipment.
This trendy looking MP3 is small, but perfectly formed, with play / stop button, and flexible speaker. It does not require batteries, the body heat emitted is enough to make it work properly. Shortcoming is that this MP3 capacity is very small, can hold an album of songs, and the volume can not be in accordance with the actual needs of the people to adjust.
Although we have not determine what the sound of Woundplast MP3 output, but the concept itself is worth exploring. When you exercise, or do not want to take up your hands, but you want to listen to music, this MP3 will come in handy by design.

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