CN201114888Y - a sound-activated light - Google Patents

Abstract

A voice-activated lamp is composed of a voice-activated pulse trigger circuit, a monostable delay circuit, a driving amplifier circuit and an electric lamp. The utility model can save electricity, and can solve the trouble that people first have to search for a light switch in panic when responding to sudden situations at night.

Description

a sound-activated light

technical field

The utility model relates to a lighting device, in particular to a voice control lamp.

Background technique

Voice-activated lights are rarely used in households, and mechanical switches are mostly used to switch on and off electric lights. However, when going to the toilet at night, the user needs to look for the light switch when lighting is needed. However, the time of using the light is not long during toilet use, and the light switch needs to be turned on and off manually, which is not humane enough.

Utility model content

The technical problem solved by the utility model is to provide a sound-activated lamp, which can be automatically turned on and off, and is convenient to use.

The technical problem solved by the utility model can be realized by adopting the following technical solutions:

A voice-activated lamp, comprising an electric lamp, characterized in that the electric lamp circuit is connected to a drive amplifier circuit, the drive amplifier module circuit is connected to a monostable delay circuit, and the monostable delay circuit is connected to a voice control pulse A trigger circuit, the sound-activated pulse trigger circuit adopts a piezoelectric ceramic sheet.

Beneficial effects: the utility model can save electricity, and can solve the trouble that people have to search for the lamp switch in a panic when responding to emergencies at night.

Description of drawings

Fig. 1 is the circuit schematic diagram of the present utility model;

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

As shown in Figure 1 and Figure 2, a sound-activated lamp is composed of a sound-activated pulse trigger circuit, a monostable delay circuit, a driving amplifier circuit and an electric lamp. The sound-activated pulse trigger circuit is composed of piezoelectric ceramic sheet B, crystal triode VT1, resistors R1 and R2. The sound-activated pulse trigger circuit receives the sound wave signal and converts it into a corresponding weak electric signal to trigger the start-up of the whole circuit; the monostable delay circuit plays the role of prolonging the lighting time of the light; the driving amplifier circuit plays the role of amplifying the electric signal to make the bulb reach the rated value The role of voltage luminescence. A voice-activated light is usually powered by three 1.5v batteries. When in use, the user only needs to close the power switch SA, and the circuit enters the power-on standby state. At this time, the resistance value of the bias resistor R1 of the transistor VT1 is relatively large, VT1 is in an incomplete conduction state (tends to a cut-off state), and the second pin of the low-potential trigger terminal of the time-base integrated circuit A connected to it is in a high state. Level, the monostable circuit is in a steady state, the two ends of the capacitor C are short-circuited by the internal conduction transistor of A through the 7th and 1st pins of A, the 3rd pin of A outputs a low level, and VT2 and VT3 are cut off without bias current , lamp H does not emit light.

When the piezoelectric ceramic sheet B receives the sound wave signal, it converts into a corresponding weak electric signal. After the positive half cycle of the signal is amplified by the transistor VT1, a negative pulse electric signal is output from its collector, and the second pin of the time base integrated circuit A immediately obtains a low-level trigger signal lower than 1/3VDD=1.5V instantaneously, so that The monostable circuit composed of A is triggered to enter the temporary stable state (that is, the delay state), the third pin of A outputs a high-level signal, VT2 obtains a proper bias current conduction, VT3 enters a fully saturated conduction state, and the small lamp H is powered on Shine bright.

As the third pin of A becomes high level, the internal conduction transistor of A is cut off, and the short circuit to the capacitor C is released, and the battery G starts to charge the capacitor C through the resistor R3. When the charging voltage at both ends of C (that is, the potential of pin 6 of the high-potential trigger terminal of A) reaches 2/3VDD=3V, the monostable circuit reverses and returns to a steady state, and the internal triode of A is turned on again, and C passes through the 7th and 3rd pins of A. Pin 1 is discharged and short-circuited again, and pin 3 of A re-outputs low level, causing the transistors VT2 and VT3 to lose bias current and cut off, and the small lamp H is automatically turned off when the power is turned off.

If the user wants to turn off the light in advance after completing the processing, he can press the reset button switch SB once during the period when the third pin of A outputs a high level and H lights up, then the fourth pin of the forced reset terminal of A will be grounded, and the monostable The state circuit is forced to reset, the 3rd pin of A outputs low level, and H goes out immediately.

Claims (1)

1. acoustic control lamp, comprise an electric light, it is characterized in that, described lighting circuit connects one and drives amplifying circuit, described driving amplification module circuit connects a monostable time delay circuit, described monostable time delay circuit connects an acoustic control pulsed triggering circuit, and described acoustic control pulsed triggering circuit adopts piezoelectric ceramic piece.

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