Circuit Schematic Low Cost Fire Alarm Based on Transistor

Alarm. - This is electronic circuit schematic of Low Cost Fire Alarm Based on Transistor like in Figure 1 below. In this circuit schematic the basic component used are transistor and relay. 

In here we will give you global description about circuit schematic of Low Cost Fire Alarm Based on Transistor and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Figure 1. Low Cost Fire Alarm Based on Transistor (Source: Circuitstoday)

Component Part

• NPN Transistor
• PNP Transistor
• Resistors
• Capacitors
• Variable resistor
• Diode
• Relay

Description

Circuit schematic like in Figure 1 above is Circuit Schematic Low Cost Fire Alarm Based on Transistor. Circuitstoday site describe that transistor BC177 (Q1) is used as the fire sensor here. When the temperature increases the leakage current of this transistor also increases. The circuit is designed so that when there is an increase in the leakage current of Q1, transistor Q2 will get biased. As a result when there is a fire breakout the transistor Q2 will be on. The emitter of Q2 (BC 108) is connected to the base of Q3(AC 128). So when Q2 is ON Q3 will be also ON. The transistor Q3 drives the relay which is used to drive the load ie,light,bell,horn etc as an indication of the fire. The diode D1 is used as a free wheeling diode to protect it from back EMF generated when relay is switched.

And now you can read more you knowledge about Circuit Schematic Low Cost Fire Alarm Based on Transistor from the original source article using link [here].

Thank you for your coming here in Electronic Index blog, we hope the article above will help you to know more about your an electronic circuit schematic design and simulation and other. Please comment here when you want to share and other. Thank you.

Share on Google Plus