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th1nking asked Transistor wiring question?
I've searched for two days to determine how to wire a transistor... there's a lot of info about engineering and math and physics... I don't want to return to college. I have a 9v dc source and an NPN transistor, where do I apply the (+) and (-) leads of my supply to the transistor and where do I apply the leads of my multimeter to measure the output? Do I need to introduce other components? (I think I understand the collector, base, emitter relationship). The plan is to use the transistor to *increase* current? (I know there are lots of laws and theories that might suggest that I worded this wrong but help me out... you know what I mean).
And got the following answer:
** With the focus on obtaining an increase in current from the input to the output, (amplification), perform the following tasks. From basics, bipolar transistor Base current controls Collector current. No base current, then no collector current, full stop. Each individual transistor increases the base current by a factor known as the current gain, ß (Beta), or hFE ( a hybrid parameter). This gain can be as high as 600 for high gain low power transistors. But can be as low as 3 for high frequency, high power transistors. However typical gains for everyday low power transistors have current gains around 150 to 300. . Using a common small signal NPN transistor, a simple setup to demonsrate this would be to connect the (+) supply lead to the (+) lead of your meter, set to measure DC CURRENT. If a manual range change meter is used, set for a few hundred mA full scale. Connect the (-) meter lead to the Collector. Connect the Emitter to the Power Supply (-). . Now any current, somewhere <1mA, which we can arrange to flow in the Base to Emitter will be amplified. This is what we are trying to arrange to show transistor current gain operation. . Connect a 100kΩ fixed resistor in series with a variable resistor, of approximate 250kΩ. (If you have a 2nd meter, set it to 1mA Full Scale, if not autoranging. Connect this in series with the two resistors. This will display Base current Ib at the same time as the other meter is displaying Ic). . Connect one end of the above series circuit to the (+) supply, and the other end to the transistor Base. If an analog meter needle kicks the wrong way, reverse the meter leads. . Switch ON the power supply. While adjusting the variable resistor, observe and note a few meter reading pairs, Each Ib has a corresponding Ic. Provided the transistor is not saturated or heating up, there should be a reasonable linear relationship between the two currents. Current Gain = Ic /Ib. Example; For Ic = 45mA, and Ib = 0.15ma( =150µA ), then Current Gain = Ic / Ib = 45 x 10^-3 / 0.15 X10^-3 = 300 . This shows that the base input current is amplified 300 times and appears as output collector current. Job done. . A very low control current <1mA , can produce much higher currents, sufficient to drive, relay coils, solid state power devices like SCRs, indicator lamps, and with another stage of current amplification, small motors. . Please request clarification if required.
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