Variable oscillator project #477, Variable oscillator (ii) project #478, Project #479 – Elenco Upgrade Kit SC100 to SC750 User Manual
Page 130: Variable oscillator (iii) project #480, Variable oscillator (iv) project #481, Photo variable resistor, Project #482, Variable whistle chip oscillator project #483, Slow adjusting tone project #484, Slow adjusting tone (ii)
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