The search returned 2 articles:

  1. February 2022: Project: Fan Controller & Loudspeaker Protector by John Clarke, PCBs: SC 01111211 [print issue] [online issue]
  2. February 2022: Project: Fan Controller & Loudspeaker Protector by John Clarke, PCBs: SC 01111211, 9 shop items [print issue] [online issue]