Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be the relay which switch on and switch off the alarm. Schematic diagram:
Circuit Schematic Diagram
Basic Theory of DC to AC Inverters
This document explains about Basic Theory of DC to AC Inverters. Title: “The ABC’s of DC to AC Inverters”, arranged “by Electronic’s Department of Northen Alberta Institure of Technology. This document will show you the basic […]
100W Audio Amplifier with Transistor BDW83D/BDW84D
Here is the circuit diagram of 100W audio amplifier which using power transistor BDW83D and BDW84D for the final amplification. It uses dual polarity power supply to work. Copyright belong to Smart Kit. The circuit should […]
Mini FM Transmitter
This is a mini fm transmitter circuit. I think this is the simplest one. Simple, easy and of course… inexpensive… The supply voltage is between 1.1 – 3 Volts with power consumption is 1.8 mA at […]
Electronic Buzzer with IC timer NE555
This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound […]
HiFi Audio Pre-amp
This is a HiFi pre-amplifier circuit diagram with low noise output. Very wide range frequency from about 10Hz until up to 100Khz? will be gained by this preamplifier for maximum audio performance. This circuit uses BC550C […]
4W Audio Amplifier using Transistor TIP41
This 4W Audio Amplifier circuit is powered by 2 pieces of transistor TIP41. The circuit is very simple and incorporates darlington output transistors that will provide more than enough output current than is needed to drive […]
10 Dancing LEDs
This is the circuit diagram of dancing LEDs which consists of 10 units LEDs. The 10 dancing LEDs circuit works like a audio level meter. The LEDs will be dance sequence with the sound level that […]
Ultrasonic Sensor Switch
Here is the circuit diagram of ultrasonic sensor switch. There are many methods of wireless switching such as by using infrared, AM/FM signal, bluetooth, etc. This is an alternate wireless switching by using ultrasonic sensor. The […]
100 Watt Inverter 12VDC to 220VAC with Mosfet
This is another 100 watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC-? up to 100w from 2-3A transformer from 12V lead […]