My Circuit

Zener diode ZD1 senses the supply, and should the supply rise above 6 V, Ql will turn on. In turn, Q2 conducts clamping the rail. Subsequent events depend on the source supply. It will either shut down, go into current limit or blow its supply fuse. None of these will damage the TTL chips. The rating of Q2 depends on the source supply, and whether it will be required to operate continuously in the event of failure. Its current rating has to be in excess of the source supply. Over voltage protection for logic Circuit Diagram

This is a simple Inexpensive car Protection Unit Circuit Diagram. This circuit to protect car stereo, etc from pilferage that costs less and requires no adjustments in the car but a good car cover. Place the circuit at your bedside and bring the two wires from the unit to the car (parked outside your home) and connect one wire-end to the cover and the other to the ground, with both wire-ends shorted by some weight such as a brick. So outwardly the mechanism is not visible. Circuit of car protection unit with alarm If someone tries to remove the cover, the alarm of the circuit starts sounding to alert you. The alarm can be switched off by resetting it using switch S1. The car protection circuit comprises two timer ICs: one for the alarm circuit (see IC2 in Fig.1) and the other to indicate that the battery has taken over as the power source (see IC3 in Fig. 2). Normally, the protector operates off AC mains and the battery takes over only when mains fail. As the battery current is not...

                                           This is the circuit diagram of 5V DC regulated power supply which featured with short circuit protection system. There are 2 kind of output that are regulated 5V DC with short circuit protection and without circuit protection. The main circuit is protected from any damage due to short-circuit in the additional power supply circuit by cutting off the derived supply voltage. The derived supply voltage restores automatically when shorting is removed. An indicator LED is utilized to show whether short-circuit exists or not. Power Supply Block: This circuit works just like the ordinary DC power supply adapter, in the main power supply circuit, 230V AC from main home electric source is stepped down by transformer X1 (230V AC primary to 0-9V, 3...

 Used as a protective circuit above uses a component named PTC , the components in the operating obstacles , but obstacles desert PTC component is influenced by temperature, whereby if the cold temperatures of less than 100 degrees celcius , then this component has a few obstacles. And when temperature run to 100 degrees celcius or higher, which is owned PTC resistance will rise ass well. Because it depends on ambitient temperature , the PTC can be assembled into a circuit protection if high ambitient temperature, tand automatically switchess off, circuit like a schematic above. Part List : R1___4K7 R2___10K R3___1K9 R4___1M R5___4k7 TH1__PTC thermistor IC____LM393

The electronic circuit described in this article's main function remote monitoring of power consumption (over current) in a domestic mains alternating current. This monitoring is necessary in many systems, especially in electronic counters, power supplies, AC, inverters, converters, etc. The operation of the circuit is simple, to be connected to the power grid, and when the circuit detects a consumption in the electric network of more than 5 mA he lights LA1 signal lamp. The device can work with currents of several amperes, it depends on the diode used in D1 and D2. The Ti1 transistor is turned on when the D1 and D2 drop exceeds a certain level. Monitor and Protection Alarm Over Current Circuit Diagram Fuse F1 must of course be dimensioned to suit the application and current limit circuit. When Ti1 leads the alternating current can flow through the capacitor, and the triac is triggered, so that lights the lamp LA1. The above circuit is a current alarm of some changes, there is a br...

This is a Simple Nicad Battery Protection Circuit Project. If a NiCad battery is discharged to a point at which the lowest capacity cell becomes fully discharged and reverses polarity, that cell will usually short internally and become unusable.  Simple Nicad Battery Protection Circuit Diagram To prevent this type of damage, this circuit detects a one-cell drop of 1.25 V and turns the load off before cell reversal can occur. Low-current zener or other voltage sensor Dl and resistors Rl and R2 establish a reference level for transistor Ql. These resistors bias the zener to a few microamperes above its `knee.`  Therefore, if battery voltage falls more than 1.25 V, Ql turns off, turning off Q2, and disconnecting the load. After the load is disconnected, if the battery returns to nominal voltage, the high value of resistor shunting Q2 provides enough output voltage to reset the voltage sensor and turn Q2 back on. If desirable, shunt diode D2 or the parasitic diode of the TMOS de...

It is very simple and low-cost Electronic circuit diagram for Reset Protection For Computers. This protection circuit is inserted between the reset switch and the motherboard. The earth connection of the computer must be linked to terminal of the protection circuit. The protection circuit can draw its power from the computer supply. When the circuit has been fitted, operation of the reset switch will not immediately restart the computer. Instead, a buzzer will sound to alert you to the reset operation. Reset Protection For Computers Circuit Diagram : The buzzer is actuated for 4 s by monostable IC1A, which is triggered by the reset switch. During these 4 s, the output, pin 5, of IC1A ensures that the reset function, pin 10, of IC1B is disabled. When the reset switch is operated again, monostable IC IB will be triggered and this starts the reset procedure. Transistor T2 is then switched on for 0.5 s and the buzzer is deactuated via Rll and D4. The circuit around T1 and N4 ensures that I...