Identification and detection of transistor 4

The three electrodes of a transistor can be identified not only by a multimeter, but also by the shape of the pins.

(3) Penetrating current L.. The estimation. Measure the collector emitter reverse resistance using a multimeter with a resistance range of R × lk. The larger the measured resistance value, the greater the L.. The smaller, the better the stability of the transistor. Generally, silicon tubes have higher resistance values than germanium tubes, high-frequency tubes have higher resistance values than low-frequency tubes, and low-power tubes have higher resistance values than high-power tubes.transistor

(4) Estimation of the common emitter current amplification factor Lu. If the multimeter has the function of measuring Lu, it can directly measure the reading; If there is no mouth measurement function, a lOOkQ resistor can be connected between the base and collector electrodes. At this time, the reverse resistance between the collector and emitter electrodes is small (i.e., the pointer of the multimeter has a large swing amplitude). The larger the pointer swing amplitude, the larger the value. Of course, if the method shown in Figure 1-63 can be used, it will be simpler and more intuitive.transistor