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If the batteries are fully charged, then the diode placed in series with the batteries and the load will keep it from discharging, so the diode is what protects the discharging. From this point on out, your circuit should work.
To test a transistor using a digital multimeter, all you have to do is check the resistances of the diode junctions of the transistor, as illustrated here, http://www.learningaboutelectronics.com/Articles/How-to-test-a-transistor. Measure each of the pairs of diode junctions, Collector-emitter...
NPN Transistors have more of the desired action that is wanted. NPN Transistors are normally off and turn on when the base current is sufficient to turn it on. PNP transistors are normally on and shut off when voltage is supplied to it. Thus, NPN transistors mimic more of the action that is...
A power transistor is capable of handling much more current than a general transistor. This is why power transistors have metallic holes on top. It is to attach a heat sink so that it can dissipate excess power, since power transistors are capable of handling so much power, it needs a way to...
You can just connect the inductor to a function generator and also to an ohmmeter of a multimeter. As you increase the frequency of the signal, the resistance should increase, so it's a frequency response testing.
Check out the resource below, as it contains a circuit and explanation of this...
Stray capacitance is unwanted and unintended capacitance in a circuit.
This can be caused by long wires running parallel to each other or long component leads of components such as from capacitors or inductors.
See
http://www.learningaboutelectronics.com/Articles/What-is-stray-capacitance
to...
The LM386 is an audio amplifier. It amplfies sound.
To set it up in a circuit, see:
http://www.learningaboutelectronics.com/Articles/How-to-connect-a-LM386-audio-amplifier-chip
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