Importance

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Abstract

A multivibrator circuit is provided having two power capacitors C1 and C2 in a power part, a primary winding N1 of a transformer T, as well as two switching transistors Q1 and Q2, and two diodes D3, D4. A positive feedback coupling is provided via the transformer winding N2 and the base resistor RB. The automatic frequency control is switched by an electrically contollable inductive component 10, which is connected in parallel to the transformer winding N2 and the base resistor RB. The component 10 comprises a control winding 17 which jointly surrounds two identical annular cores 11, 12 and comprises an induction winding 15, which comprises a series connection of two partial windings. The partial windings individually wind around one of the ring cores 11, 12. The linearly-acting inductivity L for the current i, running through the induction winding 15, can be varied via a control current i over a wide range (1:100).

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First Claim