Position: Index > Lamp Circuit >

Sound-Activated Lamp (HEP802)

2016-08-07 22:18  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

This article briefly describes the Sound-Activated Lamp (HEP802). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: HEP802 .

This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car’sLEDlight show. The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0.7 volts, act as sensitivity adjuster.

Schematic Diagram of Circuit:

Figure:1 Schematic

Figure 1 Schematic

A certain level, the signal coming from microphone, after amplification by Q1, will trigger theSCRand light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps. If we use a relay, place a 1N4007 diode in parallel with the relay coil to prevent the back-emf from relay coil destroying theSCR.

 

 


Reprinted Url Of This Article:
http://www.eeweb.com/blog/extreme_circuits/sound-activated-lamp-relay-switch