Continuous Oscillation Generator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Continuous Oscillation Generator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Generators, heterodynes

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Currently, there are a large number of the most diverse schemes of high-frequency generators with self-excitation. It is believed that they all come down to an inductive or capacitive three-point. However, back in 1971, I developed a circuit that I find it difficult to attribute to one of the two above types. In my opinion, in this case, an analogy with a physical pendulum is more appropriate, which has a source of energy replenishment and, in turn, spends part of the energy on controlling this source (not counting, of course, external losses).

A feature of the circuit is that the oscillatory LC circuit, which determines the generated frequency, is not connected to the circuit by any conductors and capacitors. That is, only inductive coupling takes place, and the oscillatory circuit performs not only a selective, but also a phase-shifting role. The device was experimentally tested, its performance was confirmed. An application for an invention was even filed (unfortunately, later "hacked").

Still, I want to offer readers this generator circuit.

Continuous Oscillation Generator

All coils (L1 ... L3) are wound on one common frame - 19 mm in diameter in one layer with PEL wire 0,4 mm. Winding - solid, coil to coil. L1 contains 20 turns; L2 - 3 turns; L3 - 8 turns. The beginning of the windings are shown in the diagram. L2 and L3 are located on opposite sides of L1. The distance between L1 and L2 is 7 mm, between L1 and L3 is 6 mm. With these parameters, the capacitance C1 covers the frequency range 14 ... 30 MHz.

Interestingly, the connection between L3 and L2 with the inclusion shown in the diagram and the absence of the circuit C1, L1 is negative, since the cascade with a common cathode rotates the phase by 180 °. In addition, this is a weak connection (in the absence of a ferromagnetic core), since the coils are spaced quite far apart. Thus, generation without the circuit L1, C1 is impossible (we neglect the influence of parasitic parameters).

The voltages and fields on opposite sides of the resonant frequency of the parallel circuit L1, C1 are out of phase, therefore, introducing it into the gap between L2 and L3 leads to the fulfillment of the phase balance condition, i.e. the total phase shift turns out to be 360°. With sufficient loop gain, which is determined by the gain of the VL1 stage, the amount of coupling L3-L1, L1-L2 and losses, generation occurs.

It is clear that with two amplifying stages, each of which rotates the phase by 180 °, the ends of one of the coupling coils (L2 or L3) should be swapped.

The physics of the operation of this circuit is very clear in comparison with the "three-point" circuits, and really resembles a "physical pendulum". At the same time, this circuit differs from some similar frequency pull circuits in terms of operation. The implementation of such a generator is also possible on transistors, and generation is easier to obtain when using two amplifying stages.

This circuit can be used for a non-contact subband switching circuit in the receiver. Execution of the contour in the form of a key can be useful for electronic locks. In addition, the circuit can be used for capacitive relays, because the connection can be adjusted very easily (by changing the distance between the coils).

Author: A.Goncharov (RU4HG), Samara; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Knots of amateur radio equipment. Generators, heterodynes.

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