Discrete components sound and light control stairs delay switch circuit 4

This circuit describes a sound and light control delay system for a walkway stairs light switch. It involves various components including 220V AC electric bulbs, diodes (VD1-VD4), and resistors. The circuit utilizes a rectifier regulator to stabilize the voltage supply. During the daytime, the circuit operates with low resistance, allowing specific transistors (VT3 and VT4) to conduct, while others (VT1 and VT2) remain off. When an acoustic signal is detected, the system amplifies the signal, triggering the light to turn on. As the sound subsides, the circuit resets, and the light turns off after a delay determined by the resistors used.

The sound and light control delay circuit is designed to enhance safety and convenience in illuminated pathways, particularly on stairs. The primary components include a 220V AC power source, light bulbs, diodes (VD1 to VD4), resistors (R1, R2, etc.), and multiple transistors (VT1 to VT5). The circuit's operation hinges on the interaction between these components to manage the lighting based on ambient sound levels.

The circuit begins with the AC power supply, which feeds into the light bulbs through a series of components that include diodes for rectification. The diodes (VD1-VD4) rectify the AC voltage, allowing it to be usable for the rest of the circuit. The rectified voltage is then stabilized by a regulator circuit, ensuring consistent voltage levels for the transistors to operate effectively.

In daylight conditions, the circuit maintains low resistance, enabling transistor VT4 to conduct. This condition results in a low collector potential at VT3, preventing it from turning on. Consequently, transistors VT1 and VT2 are off, which keeps the light bulbs off as well. The circuit is designed to remain in this state until an acoustic signal is detected.

When a sound is picked up by the microphone, it triggers the amplification process through VT3, which boosts the acoustic signal. This amplified signal subsequently activates VT2 and VT1, allowing current to flow through VT5, which powers the light bulbs. The illumination occurs as long as the acoustic signal is present.

Once the sound fades, the circuit begins its delay sequence. The resistors (R) control the timing of this delay, allowing the circuit to remain active for a predetermined period before turning off the light. As the sound dissipates, VT2 enters a recovery state, leading to the deactivation of VT1 and, consequently, the light bulbs. The circuit is designed to ensure that the lights remain illuminated for a short duration even after the sound ends, thereby enhancing visibility during transitions.

The overall timing of the delay can be adjusted by modifying the resistor values in the circuit, allowing for customization based on specific needs. This circuit is particularly useful in environments where hands-free operation of lighting is beneficial, such as in residential staircases or public walkways. The combination of sound detection and light control provides an efficient and user-friendly solution for managing illumination in various settings.Another setback law sound and light control delay walkway stairs light switch circuit. VDl - VI) 1, off + VT5 constitute Ji - Ji Guan road called Route VTl- VT4 control with ot her components of the composition, 220V AC electric bulbs by Chan E, diode VDI- VD4, R; 5 vs simple composition of the ohmic drop n, rectifier regulator circuit, in (1 Liduan available by 1 () ,. abysmal stabilized voltage power supply control back to the hoof. RI. VT4 composition and light control circuit, daytime s. exhibits low resistance, VT4 conducting, the audio amplification tube VT3 collector potential clamped at low Iu half, so VT3 can not be made small.

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