Tuning indicator circuit

Details Tuning indicator circuit Tuning indicator circuit

1978-09-20

1981-03-31

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 36, H04B 116, H03J 102

Patent

active

042597455

ABSTRACT:
Disclosed is a tuning indicator circuit including a receiver in which an output signal voltage of a detector circuit of the receiver is compared with a reference voltage from a voltage divider by means of a voltage comparator, whereby a tuned or untuned state of the receiver will be detected. The tuned or untuned signal is applied to a light emitting diode driver circuit via an AND circuit, together with a light emitting diode driving signal from an oscillator. The driving circuit allows a light emitting element for power supply and tuning indication to be continuously on in a tuned state, and turns the element on and off in a untuned state with power on.

REFERENCES:
patent: Re19170 (1934-05-01), Senauke
patent: 3365669 (1968-01-01), Funaki et al.
patent: 3696301 (1972-10-01), Hoshi
patent: 3882399 (1975-05-01), Karpowyce et al.
patent: 3896386 (1975-07-01), Ohsawa
patent: 4131853 (1978-12-01), Dreiske

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