A simple LC oscillator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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A simple LC oscillator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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A simple LC oscillator can be used in instrumentation. The advantage of such an oscillator is the ability to use circuits with almost any L/C ratio.

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With L1 = 50 µH and C1 = 5 µF, the generated frequency is 10 kHz. When working on the LC circuit, there is a low operating voltage (about 100 mV). The generator itself is assembled on transistors V1. and V2, the transistor V3 is used as a preamplifier, the output amplifier is assembled on the transistor V8.

The remaining active elements are used in the AGC device. This node consists of a rectifier on diodes V4, V5 according to the doubling circuit, a DC amplifier on a transistor V7 and a regulating transistor V6, included in the power supply circuit of the master oscillator. In such an AGC system, the output voltage remains almost constant when the supply voltage changes from 3,5 to 15 V. Any silicon transistors can be used in the generator, it is only important that V1-V3 have a current transfer coefficient h21e> 150.

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