In the kit Transistor Tester a transistor analyzes, suitable for testing both NPN and PNP transistors. In the kit Transistor Tester first block is power supply in the input is 230V AC which is step down using the transformer (12-0-12) .The 12V ac input is fed to the bridge diode to gives 12V pulsating DC. This DC voltage is filtered through the capacitor to remove the ripples. The filtered DC is fed to 7809 regulator to fetch +9v regulated output. In the kit Transistor Tester the 555 operates at 2Hz. The Output of pin 3 drives the circuit with a positive then zero voltage. The other end of the circuit is connected to a voltage divider with the mid-point at approx 4.5v. This allows the yellow and green LEDs to alternately flash when no transistor is connected to the tester. If a good transistor is connected, it will produce a short across the LED pair when the voltage is in one direction and only one LED will flash. If the transistor is open, both LED’s will flash and if the transistor is shorted, neither LED will flash. kitsguru.com

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2. In the kit Transistor Tester a transistor analyzes,
suitable for testing both NPN and PNP
transistors. In the kit Transistor Tester first
block is power supply in the input is 230V AC
which is step down using the transformer (12-
0-12) .The 12V ac input is fed to the bridge
diode to gives 12V pulsating DC. This DC
voltage is filtered through the capacitor to
remove the ripples. The filtered DC is fed to
7809 regulator to fetch +9v regulated output.
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www. Kitsguru.com

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