Contents
What can you do with a bipolar transistor?
Bipolar Transistor Cookbook — Part 3. Last month’s edition of this Transistor Cookbook series described practical ways of using bipolar transistors in useful common-collector (voltage follower) circuit applications, including those of relay drivers, constant-current generators, linear amplifiers, and complementary emitter followers.
What happens to Q1 and Q2 in a bipolar transistor?
When the input is at zero volts, Q1 is cut off, so Q2 is driven fully on via R2, and the output is low (saturated). When the input is “high,” Q1 is driven to saturation and pulls Q2 base to less than 600mV, so Q2 is cut off and the output is high (at V+).
Why are the polarities reversed in a PNP transistor?
Also, all the polarities for a PNP transistor are reversed which means that it “sinks” current into its Base as opposed to the NPN transistor which “sources” current through its Base.
How to measure forced IB of a BJT transistor?
Open the 3-wire current voltage analyzer soft front panel. Carefully measure the forced IB output characteristics of the 2N3904 NPN transistor as follows. Set the Vc step to .05 volts and set number of curves to 5 as shown in figure 7.
Which is an example of a complementary transistor pair?
A complementary bipolar transistor pair includes pnp and npn transistors; while a complementary unipolar transistor pair consists of p and n transistors. Complementary transistor pairs find wide utility in power amplifiers, power supply units, gating and linear circuits and other assemblies and general-purpose equipment.
How are two NPN transistors used in Figure 3?
Alternatively, a very-high-gain non-inverting digital amplifier/switch can be made by using a pair of transistors wired in either of the ways shown in Figures 3 or 4. The Figure 3 circuit uses two npn transistors. When the input is at zero volts, Q1 is cut off, so Q2 is driven fully on via R2, and the output is low (saturated).