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--- projects:nch8200hv:nch8200hv_troubleshoot [2020/12/16 10:27]
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+++ projects:nch8200hv:nch8200hv_troubleshoot [2020/12/16 10:58] (current)
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+====== Suppress/Eliminate the High Pitch Noise ======
+In certain circumstances, the module may generate a high pitch/frequency noise, audible to human ears. It can be suppressed, if not completely eliminated, by the following method.
+**Add an aluminum electrolytic capacitor of 4.7uF/200V to the ceramic capacitor in parallel.**
+{{:projects:nch8200hv:add_extra_cap.png?400|}}
+This will efficiently suppress the noise level.
+This method has also been used by Dalibor Farny in his Puri clock ([[https://www.daliborfarny.com/product/puri-nixie-clock/|Link]]) currently in mass production.
+{{:projects:nch8200hv:puri_added_an_extra_cap_to_nch8200hv_-01.jpg?800|}}
+{{:projects:nch8200hv:puri_added_an_extra_cap_to_nch8200hv_-02.jpg?800|}}