By the way, it is worth noting that the bottom row of terminals duplicates terminals 2 and 3. This is to make it easier to install parts with spaced leads. Additional terminals of the upper row of the ZIF panel (those that are 1,1,1,1) duplicate the terminal number 1. The tester’s circuit board has a ZIF panel. However, if this is not at hand, the device can be powered from a stabilized power supply. The device is powered by a 9V battery (size 6F22). and frizz - planar capacitors and resistors. Also on the circuit board there are SMD transistors marked J6 (bipolar S9014), M6 (S9015), integrated stabilizer 78L05, TL431 - precision voltage regulator (adjustable zener diode), SMD diodes 1N4148, quartz at 8.042 MHz. The radio parts tester is assembled on an Atmega328p microcontroller. option without housing, but with housing. Do not be surprised that the device is without a case, with it it costs much more. In the photo, the universal tester R, C, L and ESR - MTester V2.07 (QS2015-T4). Let's find out what capabilities such a tester has. Many of them have the ability to test almost all running radio components. Recently, universal meters R, C, L and ESR have become affordable. And even if such a function exists, the device, as a rule, does not measure another very important parameter of electrolytic capacitors - the equivalent series resistance ( EPS or ESR). These include field effect transistors (such as Mosfetso and J-fet) Also, a conventional multimeter does not always have the function of measuring the capacitance of capacitors, including electrolytic ones. But, among the radio components, there are also those which are difficult to check with an ordinary multimeter, and sometimes even impossible.
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