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Transistor Diode Circuit
If I were to design a Class AB amplifier, which transistors would I use?
I am designing a simple amplifier, specifically a class AB amp, and want my load resistance to be 8 ohms. I have two small diodes in my circuit, and am contemplating using transistors 2N3904 (npn) and 2N3906 (pnp). Am I on the right track?
In a class AB design a negative voltage is applied to the grid which controls the flow of electrons.
You should now be aware of of the basic building blocks that appear in Power Amplifiers. That Class A amplifiers employ a high Quiescent Current (sometimes called bias current or standing current) large enough that the transistor currents are large even when the output signal level is small. It should be clear that the power efficiency of Class A amplifiers is therefore poor, but they can offer good signal performance due to avoiding problems with effects due to low-current level nonlinearities causing Distortion. You should now also see why a Double Ended output is more efficient than a Single Ended design. You should also know that Class B has a very low (perhaps zero) Quiescent Current, and hence low standing power dissipation and optimum power efficiency. However it should be clear that in practice Class B may suffer from problems when handling low-level signals and hence Class AB, with its small but controlled Quiescent Current is often the preferred solution in practice. It should also be clear how we can employ something like a Rubber Zener to set the optimum Quiescent Current and power dissipation for a given task.
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H bridge / Circuit Help?
Hello,
I am trying to make a H bridge that changes the polarity and turns the two motors that I intend to power clock wise and counter clock wise. I asked my teacher for help and I do not understand what he is trying to say. Does any one have a good explanation?
My teacher gave me a breadboard, 2 NPN and 2 PNP transistors along with two diodes and one 220 ohm resister. I also have 2 motors that runs on battery power. I am suppose to controlt this entire circuit with the computer's parallel port.
Thanks!
The computer will cut on and off the transistors. You need 4 NPN and 4 PNP transistors to control two motors( 2 of each for one motor). I can send you a schematic of what you need. It's a little hard to explain.
