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A simple beeper circuit. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Digital technology

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Below is a diagram of a beeper / bluebox / touch-tone on two 1006vi1 (NE555).

A simple beeper circuit

DA1, DA2 - 1006w1 R1,R4 - 4.3k R2,R10 - 3.9k R3 - 3.3k R5 - 10k R6 - 10k R7,R13 - 100k R8 - 2.4k R9 - 2.2k R11 - 4.7k R12 - 4.7k C1, C3 - 0.47 C2, C4 - 0.01 V1 - high-impedance loudspeaker (50-100 Ohm).

The keyboard contains the buttons themselves and two diodes per button, as shown below the diagram. The original circuit did not contain a letter column, so the resistor R10 is divided into two; the column generator is configured first by the number keys, then by the letter resistor R10.

A simple beeper circuit

Publication: N. Bolshakov, rf.atnn.ru

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