12 Volt Battery Monitor by IC LM3914

This circuit makes it posible to monitor the charging process to a higher level. Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary accuracy. Connect an input voltage of 12.65 volt between the positive and negative poles and adjust the 10K trimmer potentiometer until Led 10 lights up. Lower the voltage and in sequence all other Led's will light up. Check that Led 1 lights up at approximately 11.89 volts.

Skema Rangkaian 12 Volt Battery Monitor lm3914

At 12.65 volt and higher the battery is fully charged, and at 11.89 is considered 'empty'. This circuit, with the components shown, uses less than 10mA. Ofcourse you can adapt this circuit to your own needs by making small modifications. The circuits above is set for 'DOT' mode, meaning only one Led at a time will be lit. If you wish to use the 'BAR' mode, then connect pin 9 to the positive supply rail, but obviously with increased current consumption. The LED brightness can be adjusted up- or down by choosing a different value for the 4K7 resistor connected at pin 6/7.

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Rangkaian Sekering Elektronik 12VDC

In electronics and electrical engineering a fuse is a type of over current protection devices. Its essential component is a metal wire or strip Pls That melts too much current flows, the which breaks the circuit in the which it is connected, thus protecting the circuit's other components from damage due to excessive current.

Skema Rangkaian Sekering Elektronik 12VDC

schematics circuit  at the show above is an electronic fuse That Protects against short circuit the load voltage 12 VDC. You can adjust the current with using a 10K potentiometer. Will If you use the fuse with very high currents, the lower the resistor value 0.1/5W, Watt value of the resistor Should Be Increased also.

Note:

• IC1 can use any of the op-amp IC (eg OA 741).
• IC2 can use any SR latch flip-flop (eg 54HC279).
• Use a 12V relay and currents that are customized to your needs.

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Variable Voltage Regulator Circuit Using IC L146

This reguator circuit is designed for general purpose use. Advantages of the circuit are first the voltage can be adjusted from 0V to greater and second it does not require a double sided secondary winding transformer. For high voltage outputs you can use L146 or alternatively if you need lower voltage outputs you can use IC 723. 

L146  Variable Voltage Regulator Circuit

Regulation voltage for both integrated circuit is at least 2V. R3, R4, R5 and R6 resistors prevent this limitation and keep the output voltage at 0 level with the help of P2 potentiometer. If the input voltage is less than required, this resistors provides sufficient potential between 4 and 5 numbered pins.

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LM723 - Variable Voltage Regulator circuit

This is circuit variable voltage Regulator 3-30V at 3A max, by used IC LM723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 3 amp. The VR1 used control output 3V to 30V. It suitable for general electronics work shop. Because it is a simple circuit and easy circuit.

LM723 -  Variable Voltage Regulator circuit

Note:

• T1 can be a 220V primary, 32VCT secondary, 3A step down transformer.
• MJ3001 power transistor must be fitted on a proper heat sink.
• Output voltage can be adjusted by using the POT RV1.

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