Astable multivibrator circuit

Details Astable multivibrator circuit Astable multivibrator circuit

1978-12-26

1980-08-05

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331113R, H03K 3282

Patent

active

042164419

ABSTRACT:
An astable multivibrator includes a first transistor a single capacitor arranged in a time constant circuit, coupled to the emitter of the transistor and a potential divider circuit coupled to the base of the transistor to apply a selectable portion of a bias supply thereto. A circuit including another transistor of polarity opposite to that of the first transistor responds to the first transistor in its conductive or non-conductive state for determining the portion of potential applied to the first transistor such as to drive the transistor into greater conduction when it is conducting and further from conduction when it is non-conducting. The threshold levels of the transistors track the voltage supply, which may be varied, such that the frequency and duty factor of the multivibrator are invariant with changes in voltage supply value.

REFERENCES:
patent: 3737731 (1973-06-01), Zeewy

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