If you want an on-off switch you "saturate" the transistor, essentially make the current your feeding into the base * the "beta" (current gain) of the transistor larger than what your hoping to switch, this way the transistor is switched on as hard as it can be However it takes about 0.6-0.8V to get current to flow in to the base of the transistor, Transistors have a current gain that lets them control a larger current between the collector and emitter than the current fed in to the base, How can I increase the size of those waves even more? WHen I lower the volume on the phone the waves get smaller in amplitude. How can I amplify that wave to make the speaker that I bought play louder? In short I just want to amplify the waves that I read on the oscilloscope. The voltage varies between negative and positive therefore I do not know what cable to connect to emitter or collector. This is what I have tried to amplify the wave: Anyways when I connect those 2 cables to an oscilloscope this is what I get:Īs you can see the voltage varies from about -0.2 volts to 0.1 volts.
I soldered it like that because when I connect those two cables to a speaker I could hear sound. I soldered the tip of the audio cable to one cable and the middle part to another cable. I connect my audio cable to my phone like this: I want to amplify the signal coming from my aduio cable that is connected to my phone. Now whenever my digital pin on Arduino is set to HIGH the light turns on. In order to insert the transistor as a switch I do the following: For this example it is a 12 V lamp that I have: On the internet I see that transistors are primarily used as switches and as amplifiers. I have read a lot about transistors and I still cannot make my last example work.
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