A simple crystal detector ----- Crystal Tester

Simple crystal detector, Crystal Tester Keywords: simple crystal detector production With a general multimeter, it is not possible to measure the quality of the crystal, which provides a simple and practical crystal detector, which only uses an N-channel junction field effect tube (FET), two ordinary NPN small power crystals Three-pole, a luminous tube and some replacement elements, which can effectively test the good and bad of any crystal. As shown, the 2N3823 junction N-channel field effect tube (like a similar small power field effect tube, such as 3dj6, 3dj7, etc.), such as 3dj6, 3dj7, etc.), and two two NPNs. Three-pole 2N3904 (or other models of small power NPN trioders) are used as a composite detection amplifier to drive the light-emitting diode LED. When the crystal crystal is high, the oscillator is oscillated, and its oscillator signal is coupled to the input end of the detection amplifier via a 0.01uF capacitor, and the light-emitting diode is driven afterwards. If the crystal crystal is not good, the crystal is not yet, the light emitting diode does not illuminate. The device can check the crystal oscillator of any frequency but its optimal operating state is within 3 --- 10 MHz. The picture below shows the circuit schematic: The picture below shows the printing board

Our other product:

Professional lightning protection system for Tower	Professional FM Radio Station Equipment Package	FMUSER FU-1000C 1000W FM Transmitter With USB Audio Input Interface
FMUSER 200W FM Radio Broadcasting Package	Hotel IPTV Solution	FMUSER FSN-1000T V5.0 1KW FM Radio Broadcast Transmitter