Monthly Archives: June 2010
3 LED battery monitor circuit by BC547
| June 3, 2010 | Posted by admin under led display, led light, meter |
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This is the circuit diagram of a 3 LED bar graph type battery monitor circuit that is ideal for monitoring the voltage level of an automobile battery.When battery voltage is 11.5V or less transistor Q1 will be On and the LED D1 will be glowing.When battery voltage is between 11.5 and 13.5V, the transistor Q2…
LED based transistor tester by CD4011
| June 2, 2010 | Posted by admin under led display, meter |
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Here is the circuit of a very simple transistor tester which used two LEDs for displaying the condition of a transistor. Both PNP as well as NPN transistors can be tested using this circuit. Quad 2 input CMOS NAND gate IC CD4011B is the heart of the circuit. Out of the four NAND gates inside…
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