Abstract
In the previous chapter, we dealt with alternating currents, including circuits containing a condenser and a coil (“tank circuits”). In the present chapter, we will identify these circuits as oscillators and investigate their properties.
In Fig. 10.14, we saw a series circuit, and in Fig. 10.18 a parallel circuit. In both of these figures, the AC generator was simply indicated by the symbol ∼.
An AC generator can be fabricated from a DC current source and a variable resistor. This is accomplished using the scheme shown in Fig. 11.1: Periodic variations of a resistance E or D around a mean value U ∕ I produce an alternating current, superposed on a direct current. This yields an AC voltage between the terminals a and b.
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Notes
- 1.
In Figs. 11.12, 11.13 and 11.17, imagine that a 1.5 volt battery is inserted into the wire leading to the grid of the triode. Pohl gave details in his “Elektrizitätslehre”, 21st edition, Section 17.5. English: See e.g. https://zipcon.net/~swhite/docs/physics/electronics/Valves.html .
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Lüders, K., Pohl, R.O. (2018). Electrical Oscillations. In: Lüders, K., Pohl, R. (eds) Pohl's Introduction to Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-50269-4_11
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DOI: https://doi.org/10.1007/978-3-319-50269-4_11
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