21. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits . 22. This allows Intel chip designers to quickly fine-tune circuits to generate more speed from their microprocessors. 23. The size of the aerials makes the unit a tuned circuit resonating at one specific frequency. 24. The poles so calculated can then be used to define the tuned circuits of the individual stages. 25. The negative resistance of the screen grid cancels the positive resistance of the tuned circuit , causing oscillations. 26. The supply transformer " ( T ) " secondary winding is connected across the primary tuned circuit . 27. Standard capacitors have a fixed value of capacitance, but adjustable capacitors are frequently used in tuned circuits . 28. Two predictor circuits may overlap, with tuned circuits used for one predictor to jump over the other. 29. An inductor connected to a capacitor forms a tuned circuit , which acts as a resonator for oscillating current. 30. The resistor R1 sets the grid bias; both the input and output are tuned circuits with inductive coupling.
