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DIY Hobby projects, diagram, schematic

Electronic Circuits

DIY Hobby projects, diagram, schematic

Crystal Tester

electronicecircuits, December 12, 2009August 18, 2023
crystal tester XTal Tester

Crystal Tester

We have crystals lying about, but don’t know whether these are still working all right. The crystal tester described here will quickly show whether a crystal can be used or should be discarded.

crystal tester XTal Tester circuit
PARTS LIST
R127kΩ
R21kΩ
R3560Ω
C11n (102)
C2100pF
C31n (102)
C44.7n (472)
D11N4148
D21N4148
D3LED
Q1BC550C
Q2BC550C
XCrystal
Sw1Switch
BT19V Battery

Transistor Q1 and the crystal under test from an oscillator. Capacitors C1 and C2 form a voltage divider in the oscillator circuit. If the crystal is in good order, the oscillator will work. Its output voltage is then rectified and smoothed by D1 and C4 respectively. The resulting direct voltage at the base of Q2 is sufficient to switch this transistor  on, so that the LED lights.

The circuit is suitable for use with crystals of a frequency between 100kHz and 30MHz. Current consumption is about 50mA.


Please send your ideas, those are very important for our success…

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Comment

  1. Jack Smith says:
    June 4, 2011 at 8:40 pm

    I have built this circuit and it works great.

    Reply

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