Electronic chirper
AssigneePlayart Limited
InventorFong Pui
Life of this patent
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Abstract
An audio frequency signal generating circuit for producing repeated tones that includes a pair of transistors. The first transistor has its collector connected to a voltage supply line, has a capacitor connected between its emitter lead and earth, and also has an inductance connected to its emitter lead. The collector of the second transistor is connected to the other side of the inductance and the emitter is connected to the other side of the supply. The first transistor has biasing means to bias it into an operating condition and the second transistor is arranged with reactive feedback to cause oscillation.
Claims8
An audio frequency signal generating circuit for producing repeated tones comprising
- a pair of transistors,
- the first transistor having one of its collector and emitter connected to a voltage supply line, having a capacitor connected between the other of its collector and emitter and the other side of the supply, and also having an inductance connected to that other of its collector and emitter,
- the second transistor having one of its collector and emitter connected to the other side of the inductance, and having the other of its collector and emitter also connected to the other side of the supply,
- the first transistor having biasing means to bias it into an operating condition and the second transistor being arranged with reactive feedback to cause oscillation.
Dependencies are inferred from the claim text.