Modified crystal frequency tester with remote control ----- Crystal Tester

Modified crystal frequency tester with remote control, Crystal Tester Keywords: modified crystal frequency tester with remote control Modified crystal frequency tester with remote control The crystal oscillator is referred to as "crystal", which is widely used in electronic clock, walkie-talkie, single chip microcomputer, color TV color-emitting field oscillation frequency division circuit and remote control. For the judgment of crystal and bad, the general maintenance personnel can only determine whether there is leakage, short circuit or measurement of the two-legged capacitance value to roughly estimate it, and there is a frequency offset, and the deflation is unable to measure. . At the same time, the instrument of the test crystal frequency is high, it is difficult to buy, and the utilization rate is low. The author uses a color TV remote control, plus a small piece of circuit board, after the material is ready for half an hour, modified into a simple remote control detection and crystal frequency tester, with a digital frequency meter, accurately measure the remote control The crystal frequency and the judgment the remote control is excellent. The modification method is as follows: Turn on the rear cover of the remote control, remove the crystal crystal on the circuit board. Test clamp is made with a two-column 4 pin IC socket, the socket is soldered on the board, the IC 1, 2 feet and 3, 4 pins, 2 leads leads to the two wires that are removed by the crystal oscillator. Welding. Connect the element according to the attached drawings, the IC output foot inside the R2 remote control, the 3V power supply can be obtained directly from the remote control. When testing the remote control, simply simply align the infrared photosensitive diode on the small circuit board, then press the remote control button, if the light emitting diode is shining, the remote control is good, otherwise it is bad. of. When the crystal frequency is detected, the crystal crystal is first inserted on the test clip. Crystal vibration, re-use frequency meter (the author used victory VC920 pocket digital multimeter) Measures the frequency of both ends of the crystal, and the crystal rate can be obtained. Experiments have proved that the notch, and the three-sized crystal excitation can vibrate. 1 MHz or less crystal can be accurately measured by a multimeter, greater than 1 MHz crystal, and the multimeter is turned on. 7.15 MHX The following crystals will make the diode to illuminate. It is recommended that the remote control manufacturer organizes staff design to develop such products. If several components are added to the universal television remote control, the product is produced, it is convenient for home appliance repair and electronic manufacturers.

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