Editing Thyristor (section)

=== Frequency ===
Thyristors is designed for low frequency applications i.e. those below 1kHz.<ref>{{Cite |title=Basics on the thyristor (SCR) structure and its application, AN4607 |date=2018 |url=https://www.st.com/resource/en/application_note/an4607-basics-on-the-thyristor-scr-structure-and-its-application-stmicroelectronics.pdf |url-status=live |publisher=[[NXP Semiconductors]]}}</ref> Frequencies higher than the domestic AC mains supply (e.g. 50&nbsp;Hz or 60&nbsp;Hz), require thyristors with lower values of ''t''<sub>Q</sub>. Such fast thyristors can be made by diffusing [[heavy metal (chemistry)|heavy metal]] [[ion]]s such as [[gold]] or [[platinum]] which act as charge combination centers into the silicon. Today, fast thyristors are more usually made by [[electron]] or [[proton]] [[irradiation]] of the silicon, or by [[ion implantation]].  Irradiation is more versatile than heavy metal doping because it permits the dosage to be adjusted in fine steps, even at quite a late stage in the processing of the silicon.