Piezoelectric warbler

Details Piezoelectric warbler Piezoelectric warbler

1995-11-21

1997-10-07

Hofsass, Jeffery

Communications: electrical

Audible indication

Electronic

340384, 3403847, 331 49, 331 68, G08B 310

Patent

active

056753128

ABSTRACT:
An electronic audio circuit operates a piezoelectric audio transducer to produce a two-tone warbling audio output. The electronic circuit includes an integrated circuit double timer and integrated circuit logic gates. One timer produces a toggling frequency that operates a toggling circuit composed of a logic gate to electrically connect and disconnect an electrical component from a frequency determining network to produce two frequency determining networks. The other timer produces two tones depending upon which frequency determining network is electrically connected to the other timer. The two tone are buffered and then drive a two-element piezoelectric transducer.

REFERENCES:
patent: 4179690 (1979-12-01), Nicholls
patent: 4193060 (1980-03-01), Slavin et al.
patent: 4558305 (1985-12-01), Blacke et al.
patent: 4626799 (1986-12-01), Matievic
Mims, Forest M. III, "Radio Shack Engineer's Mini-Notebooks" 555 Circuits, p. 23 (1993).
National Semiconductor CMOS Logic Data Book, "MM74COO Data Sheets", pp. 6-9 thru 6-12 (1988).
National Semiconductor Linear Data Book 3, "LM556C Dual Timer Data Sheets", pp. 5-46 thru 5-49 (1988).

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