![]() ![]() It should be noted that the load resistor and output terminal have been shifted from the transistor's collector to its emitter in this circuit, which is the primary difference between this design and the one shown in Fig. Making a Buffer Gate using a Single BC547 BJTĪ voltage follower, or buffer amplifier, is a type of logic switching configuration identical to that shown in Figure 2. Note that the circuit can work like a buffer when the load resistor and output connection are shifted to the transistor's emitter. The supply voltage is adjustable between 1.4 and 6 volts DC. In all the designs, the resistors are all 1/4 watt, 5% units. ![]() R1 and R2's values were selected to strike a compromise between low current drain and compatibility. Making a NOT Gate with a Single TransistorĪny transistor that is equivalent to it (such the 2N2222, 2N4401, etc.) would work. ![]() The basic switch circuit is a simple transistor application, which is one of the easiest designs. To avoid damaging the device or the parts that support it, suitable safety measures should be undertaken before connecting your circuit.Įven though our circuits are predominantly centered on Bipolar Junction Transistors (BJTs), they could have equally well been constructed using FET technology. The logic circuit examples explained in this article make use of bipolar NPN transistors since they are affordable and don't need special handling. Burnt components may ruin an enjoyable, creative evening of experimentation or innovation, not to forget the emotional pain of debugging. Electrostatic and general experimental misuse make FETs particularly prone to damage. Also, a bulk packet of bipolar transistors could generally be purchased for the price of a pair of FETs.įET handling necessitates significantly more care than bipolar transistor handling. Furthermore, the voltage available may decrease below the FET's optimum working range if a current-limiting or pull-down resistor is attached to the gate.Ĭonversely, bipolar switching transistors have an advantage in extremely low voltage, single battery applications since they only need 0.6 to 0.7 volts to switch on.įurthermore, the majority of common FETs, which are normally sold in bubble packs at your nearest electronics store are often costlier than bipolar transistors. Typically, the gate voltage limit is one volt or so. However, they have one limitation in extremely low-voltage applications. Additionally, they need very low gate-turn-on current.
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