9014 is an NPN type triode, used in common amplifying circuits. The 9014 can often be seen in old radios. Although 9014 has less power, it has a wide range of applications. There are some differences in the 9014 marking methods of different manufacturers. Some ST9014, S9014, C9014, SS9014, etc., but the functions, parameters, and packaging are basically the same, but they can be used instead, but pay special attention to the suffix after 9014, which is different The suffix letters represent different magnifications. The PNP transistor that is complementary to 9014 is 9015.
The common packages of 9014 triode are TO-92 and SOT-23. The pin distribution of 9014 triode is the same as that of other NPN triodes.
Of course, we can also use a multimeter to identify the pins of the 9014 transistor, and we can use a multimeter to measure and identify the resistance of 1K.
The first step is to identify the b pole (base pole): because the 9014 is an NPN transistor, when the black test lead is connected to the b pole and the red test lead is connected to the other two pins, the measured resistance value is relatively small. The PNP-type transistor is the opposite. You need to connect the red test lead to the b pole to measure the smaller resistance value.
The second step is to identify the c pole (collector) and e pole (emitter). The black test lead is connected to the b pole, and the red test lead is connected to the other two pins. The pin with the relatively small resistance value is the collector, and the resistance value is relatively large. Is the emitter.
The working current of 9014 is within 100mA, which is relatively small, and the working voltage is within 45V. The magnification is divided into several levels, A file is 60~150, B file is 100~300, C file is 200~600, and D file is 400~1000. When designing the circuit, you need to choose a suitable suffix, such as SS9014D, which means it is The magnification is 400~1000. Of course, different manufacturers have different suffix marking methods. Some use H/L, some use Q/R/S/T, etc. It is recommended to read the specifications clearly.
9014 can generally be used to drive some power comparison devices, such as LEDs, buzzers, and small relays. It is also often used in signal amplification circuits. The first-stage amplification of wireless microphones can generally be found in 9014.