Electronic circuit for producing an irregular pulse train of var

Details Electronic circuit for producing an irregular pulse train of var Electronic circuit for producing an irregular pulse train of var

1990-11-16

1991-10-29

Grimm, Siegfried H.

Oscillators

Plural oscillators

Oscillator used to vary amplitude or frequency of another...

331 78, 331111, 331143, 331185, 340384E, 446409, H03K 336, A63H 3326

Patent

active

050619055

ABSTRACT:
An inexpensive yet effective circuit for producing an irregular pulse train of variable frequency and duty cycle, particularly for generating simulated sounds, such as engine sounds for toy vehicles, is disclosed. The circuit comprises an integrated circuit including a plurality of Schmitt trigger inverters (U1A, U1B) configured for oscillation at different frequencies, and a resistance element (R3, R7) in series with one, and preferably both, of the power supply connections to the inverters, with the circuit output comprising the output of one of the Schmitt trigger inverters (U1B). In a preferred embodiment, a capacitance element (C4) is connected between the output of a Schmitt trigger inverter and its system voltage input for further modulating the circuit output.

REFERENCES:
patent: 4219962 (1980-09-01), Dankman et al.

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