MPF161 Transistor (1 Piece)

you [Music] this video is going to known as a buy set the buy set is a combination of a BJT a bipolar Junction transistor here is q2 and the field effect transistor in this case an n-channel in q1 the reason that this is the circuit is used is that as a rule if we if I used 2 inch LJ pets or peach ham Jay pets the the typical gain of AJ FET is anywhere from five to about 15 for the AV and if I use a second end channel the gain would be just you know 5 squared 5 times 5 or 15 times 15 so we're looking at a gain of from 25 to about 225 if I had used to be JT's the gains can be several hundred for each one and if we if we just make it 100 for each stage so we have 100 squared 100 times 100 and it's going to be a gain of 10,000 well the problem with the BJT is is that they tend to be really power hungry so we don't want to draw a power supply down too much room this is battery operated the