• on Test & Measurement
  • Published in issue 7/2009 on page 112
About the article

Quartz Crystal Tester

An ohmmeter or capacitance meter will not measure anything across a quarzt crystal, since it will have a resistance of several megohms (MO) and a stray capacitance of only a few picofarads (pF) — regardless of whether it's working or not. So the only solution available to us is to fit the crystal into a circuit, i.e. an oscillator, and see if it oscillates or not. This is just what our tester does — and at a ridiculously low cost.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 22kOhm
R2 = 1 kOhm (corrected value w.r.t. printed edition)
R3 = 680Ohm (corrected value w.r.t. printed edition)
C1 = 1nF
C2 = 100pF
C3 = 2nF2
C4 = 10nF
C5 = 100nF
D1, D2 = 1N4148
T1 = BF494
T2 = BC547
Socket for HC6/U and/or HC 18/U type xtal
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