Simple Door Open Alarm Circuit using Reed Switch uses reed switch which makes alarm sound when door opens; this simple circuit help protect door from people not allowed. Also, it have reed switch, transistors, resistors, buzzer, diode and LED and here, reed switch control power to alarm. Circuit Working: Parts List: Components Values Quantity Resistors […]
Mini Projects
Simple FM Microphone Transmitter Circuit
FM mic transmitter is small device and it changes sound from mic into radio signal. FM radio can hear it in short distance and this Simple FM Microphone Transmitter Circuit uses one NPN BC547 transistor., even it is small it can send FM signal pretty far. Circuit Working: Parts List: Components Values Quantity Resistors 330Ω […]
How to Design Crystal Oscillator Circuit
To Design Crystal Oscillator Circuit we need know some basic things; first use crystal to make steady frequency and then choose right crystal and connect with other parts like resistor and capacitor. After that, be sure circuit give right signal for our device. Therefore, these easy steps help us build good working circuit. Circuit Working: […]
Simple Over Voltage and Reverse Voltage Protection Circuit
Our device is safe from bad voltage by using this Simple Over Voltage and Reverse Voltage Protection Circuit, as this circuit uses P channel MOSFET FQP47P06 which better than only diode. Furthermore, simple diode can stop reverse voltage but not protect from overvoltage or surge, but here the MOSFET and Zener diode give protection. Circuit […]
Simple 5V Audio Amplifier Circuit using IC LM4876
Bridge tied 5V audio amplifier using LM4876 IC and this Simple 5V Audio Amplifier Circuit using IC LM4876 make sound louder and is good for small speaker in portable device. Also, its hard to make small amplifier with low power need, but LM4876 chip give 1 watt output and is good for this job; as […]
Simple Single Transistor Audio Amplifier Circuit
Name say it, this is very Simple Single Transistor Audio Amplifier Circuit, which makes sound signal bigger means amplify. Furthermore, it is god to learn how transistor work and how amplification happen, also if we want to build easy audio amplifier? then no need of many parts? this one transistor circuit is good choice! It […]