SU1283706A1 - Electronic timepiece - Google Patents

Abstract

The device is designed to read and display the current time and allows you to expand the range of adjustment of the waveform. In the presence of a coincidence signal at the output of the coincidence circuit 5, the control unit 7 generates an audio signal at its output. The input plate of the piezoceramic sound transformer-emitter 17, connected between the emitter and collector of the transistor 20, emits a sound at the frequency of the output of the control unit 7. A change in the values of the capacitor 13 of the resistors 10, 18 and 19 allows for the adjustment of the shape of the sound signal over a wide range. 1 il.

Description

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The invention is intended for counting and displaying the current time, as well as for sounding a signal at a predetermined point in time.

The purpose of the invention is to expand the range of adjustment of the waveform.

The drawing schematically shows an electronic clock.

The electronic clock contains a generator 1 for generating a time reference signal, a divider 2 for the frequency of the reference time signal and receiving a set of signals with different repetition frequencies, a pulse counter 3 for counting one of the signals of the dividing circuit and receiving the current time signals, memory register 4, in which the alarm time code is entered, the coincidence circuit 5 is used to highlight the instant of the alarm time code and the current time code and generate a coincidence signal at the output, display 6 to display information and the current time and alarm time, the alarm control unit 7 and the alarm 8.

The two inputs of the alarm control unit 7 are connected to the outputs of frequency divider 2, one of the signals of which determines the frequency of the pulse bursts at the output of block 7, i.e. the sound distortion (usually 1-2 Hz) 5 and the other is the pulse frequency in the packet 2048 or 4096 Hz).

In the simplest case, block 7 is a 3-input circuit I.

The signaling device 8 includes the first and second resistors 9 and 10, the first and second transistors 11 and 12, the first capacitor 13, the third resistor 14, the second capacitor 15, the fourth resistor 16, the piezoceramic transformer - sound emitter 17, the fifth and second resistors 18 and 19, the third and fourth transistors 20 n 21 n the seventh resistor 22.

On these elements are completed blind blocks:

a sound generator consisting of a transistor 20, resistors 22, 16 and 14, a capacitor 15 and a piezo-ceramic sound transformer-emitter 17, the collector of transistor 20 being connected to the input element of a piezo-ceramic transformer emitter 17 through a resistor

22 - to the negative output of the power source and through a resistor 16 - to the connection point of the base of the transistor 20, the output element of the piezoceramic transformer-emitter

17 of the sound, the resistor 14 and the collector of the transistor 11, and the emitter of the transistor 20 is connected to the connection point of the common output of the piezoceramic

transformer emitter 17 of the sound, the collector of the transistor 21 and the capacitor 15, and the second output of the latter is connected to the collector of the transistor 12 directly and to the base

a transistor 20 through a resistor 14J

a synchronization unit consisting of a transistor 11 and a resistor 9, the base of the transistor 11 being connected via a resistor 9 to the connection point

the output of the alarm control unit 7 and the resistor 10, and the emitter of the transistor 11 is connected to the positive output of the power source,

a modulation unit consisting of transistors 12 and 21, resistors 10, 18, 19 and electrolytic capacitor 13, the latter’s positive output being connected to the positive pole of the power source, and the negative terminal of the capacitor 13 being connected to the emitter of the transistor 12, through series-connected resistors

18- 19 - to the positive output of the power source, the base of the transistor

21 is connected to the connection point of resistors 18 and 19, and the emitter of transistor 21 is connected to the positive output of the power source, the base of transistor 12 is connected via resistor 10 to the code of the alarm control unit 7.

Electronic clocks work as follows.

In the presence of a coincidence signal at the output of the coincidence circuit 5, the control unit 7 generates a discontinuous audio signal at its output. In this case, the signal of a lower frequency at the input of block 7 determines the frequency of the succession of bursts of pulses applied to the annunciator 8j and the signal of a higher frequency at the other input of block 7 determines the frequency

following impulses in a pack.

When there is a match signal, the input of the detector 8 is periodically connected (for example, with a frequency of 2048 Hz at intervals of 1 s)

through the output transistor of the signaling control unit 7 to the negative pole of the power source.

The capacitor 13 is charged by voltage pulses across the circuit: the negative output of the power source is the output transistor of the signaling control unit 7, resistor 10, the base-emitter junction of transistor 12, the capacitor 13, the positive output of the power source. An exponentially increasing voltage from capacitor 13 is supplied through a divider on resistors 18 and 19 to the base of transistor 21, smoothly opening it. The transistor 11 inverts the input signal and supplies it to the base of the transistor 20, periodically locking the latter.

The input plate of the piezoceramic sound transformer-emitter 17, connected between the emitter and collector of the transistor 20, emits a sound at the frequency of the high- / soda unit 7.

During the pause between the pulse bursts from the output of the block 7, the transistor 11 is closed and the transistor 21 is kept in the open state by an exponentially decreasing voltage supplied from the capacitor 13.

A piezoceramic sound transformer-emitter 17, which is a positive feedback driver, also emits a sound at its own resonant frequency and exponentially decaying amplitude.

Resistor 16 serves as a collector load; oh transistor 11 at the same time as the resistance of the bias for the transistor 20 of the sound generator.

Transistor 12, resistor 14 and capacitor 15 form an auxiliary circuit, which increases the volume of the sound and affects the timbre. The ratings of the elements of this circuit are determined by the parameters of the sound generator block. In the particular case, when the resistance of the resistor 14 is equal to infinity and the capacitance of the capacitor is equal to zero, a diode can be used instead of transistor 12 (instead of its base-emitter transition).

When the output transistor of the block 7 is open, the capacitor 15 has time to charge along the circuit: the output of the block 7, the resistor 10, the base-to-collector transition

a transistor 12, a capacitor t5, a transistor 21, a positive pole of the power source.

When the output transistor of the block 7 is closed, the discharge current of the capacitor 15 is added to the current entering the base of transistor 20 through the circuit: top (according to the diagram) capacitor plate 15, resistor 14, base-emitter junction of transistor 20, capacitor bottom plate 15 The discharge current of the capacitor 15 contributes to a more complete opening of the transistor 20, the amplitude of the pulses on the collector of the latter increases, which leads to an increase in the volume of the sound emitted by the piezoceramic transformer - I7 emitter.

During the pauses between the bursts of pulses from the output of block 7, there is a chain of resistors. - capacitor 15 prevents self-excitation of the sound generator at higher parasitic frequencies, reducing the transformation ratio of the piezoceramic transformer-emitter 17 for high frequencies, and participates with resistor 16 in the formation of negative feedback stabilizing the operation of the sound generator.

A change in the values of the elements 10, 13, 18 and 19 allows for a wide range of adjustment of the shape of the sound signal.

Claims (1)

Invention Formula An electronic clock containing a memory register, a display and a generator connected in series, a frequency divider, a pulse counter, a co-ownership scheme, an alarm control unit and an alarm device, while the second output of the frequency divider is connected to the memory register input, the first output of which is connected to the second input coincidence circuit, and the second output - with the first input of the display, the second input connected to the second output of the pulse counter, and the third input - to the third output of the frequency divider, the fourth and fifth outputs of which are connected ootvetstvenno with vtorm and third input control unit Sig lysates tion, characterized in that in order to form the expansion audio signal adjustment band signaling is made in the form of four 5128 transistors, seven resistors, two capacitors and a piezoceramic transformer, with the signal of the detector connected via the first resistor to the base of the first transistor, and through the second resistor to the base of the second transistor, the collector of the first transistor and the base of the third transistor , through the third resistor - with the collector of the second transistor, and through the fourth resistor is connected to the second output of the piezoceramic transformer and to the collector of the third transistor which is through the seventh 6 the resistor is connected to the negative output of the power source; the collector of the second transistor is through the second. the capacitor is connected to the third output of the piezoceramic transformer, to the emitter of the third transistor and to the collector of the fourth transistor, the base connected through the fifth resistor to the emitter of the second a transistor which is connected via the first capacitor to the emitter of the first and fourth transistors and to the positive output of the power sources, which is connected via the sixth resistor to the base of the fourth transistor.