lkpsales.blogg.se - How to test a 2n3055 transistor

If you don't, check out (actually, check out that whole online book-it's a great resource and easy to follow).Ī transistor uses a small amount of current flowing into its base to control a larger current flowing between its collector and emitter. Nothing else will make sense unless you know that V = IR (V means voltage, I means current, and R means resistance).

I'm just a hobbyist but I use it every time I have to think about electronics. I should probably say that you really, really want to learn Ohm's Law if you're going to mess with this stuff. NPN and PNP are opposites (mostly) so 'cutoff' and 'saturation' mean the opposite things for them. Yes, those are basically the three states for a transistor. But if there is no need for frequent field inspections or not to feel like to mess around with the circuit, the described method of testing the FET with a multimeter will be an excellent solution to the task.(If you are a female, can we call you 'Miss Demeanor'?) Such a method will give a quick and accurate diagnosis. To test the FET, small circuits to which the field transistor is connected can also be used. The described procedure is meant for the n-channel field, the p-channel is tested similarly, only the polarity of the probes needs to be changed. The shutter of the working FET should have a resistance equal to infinity.ĭone, field effect transistor is in working order.

Return the black probe back and observe that the indication of the transition has returned to the original – the field transistor has completely closed.

Transfer black probe the drain (D) to the shutter (G) – to close the field effect transistor.

See that the value of the transition has changed, it has become slightly smaller – the field-effect transistor has partially opened. Return the red probe back to the source (S).Remove a red probe from the source and touch the shutter (G) – so we partially open the FET.The black probe (-) is connected to the drain (D), and the red one is connected to the source (S) – the transition value of the built-in oncoming diode will be shown on the screen.How to test a FET with a multimeter?įor a simple check of the field effect transistor, it is necessary to perform the actions according to the scheme. Checking the field transistor is important and, in some cases, one of the first steps in repairing the equipment. In powerunits or uninterruptible power supplies, field effect transistors often break down.