In winter season, water and surrounding air can go below zero degree and at that time it is useful to have a small alarm which tells us when temperature goes near freezing point. This Buzzer Alert at 0°C Indicator Circuit uses thermistor sensor, one op-amp IC and a piezo buzzer to make sound alarm when […]
Transistor Circuits
Automatic Light Control Switch Circuit using IC 555
To begin with, this article is for Automatic Light Control Switch Circuit using IC 555, it works with light dependent resistor (LDR). When light falls on the LDR, its resistance changes, the 555 IC converts this resistance change into a switching signal and drives the relay; the relay can then control a lamp, fan, motor, […]
AM Radio Circuit using Transistors
This article show how make AM Radio Circuit using Transistor, as it uses easy parts like transistor, capacitor, resistor and inductor. Also, parts are easy to find and good to learn basic radio frequency RF, catch signals and to make sound louder. Circuit catch medium wave AM signals and changes AM signal to sound and […]
Headphone Amplifier Circuit using Transistors
Headphone Amplifier Circuit using Transistors make weak sound strong so headphones work well, also this circuit is useful when sound is direct from source which is not loud or clear. In addition, in this post we will talk about small 3V transistor amplifier for better sound. Circuit Working: Parts List: Components Values Quantity Resistors (All […]
High Current 12V Voltage Regulator Circuit using Transistor
Voltage regulators is very important in power supply as they keep voltage steady and even if input voltage changes or load changes. Also, this circuit give steady 12V output with max 3A current and if current need more than 3A then it still works good for regulation. High Current 12V Voltage Regulator Circuit using Transistor […]
Boost Converter 12V to 120V DC Step-Up Circuit
Boost Converter 12V to 120V DC Step-Up Circuit raises a 12V DC input to 120V DC output; it helps convert voltage levels when required and delivers a high 120V output from a 12V source. Circuit is good for using high voltage from low voltage like battery and output powers to about 100 watts. Here, circuit […]