This simple heat sensor circuit uses just one transistor and a special resistor that acts like a thermometer. As things heat up, this resistor changes its behavior, which the transistor picks up on. Depending on the temperature, the transistor acts like a gatekeeper letting electricity flow through or blocking it completely. This way, the circuit […]
Transistor Circuits
Simple Low Battery Indicator Circuit Using Two Transistors
This post shows you how to build a tiny helper circuit for your battery powered devices. It uses just a few parts including 2 transistors to light up an LED when the battery is getting low. This way, you will know when it is time to replace the battery before your device stops working. Circuit […]
Simple 300 Watt Power Amplifier Circuit using Transistors
Calling all music lovers who want their speakers to sound REALLY loud! This article shows you how to build a super powerful amplifier circuit that can pump out 300 watts of sound with 8 ohm speakers or even more with 4 ohm speakers. Building circuits with high voltage can be dangerous. If possible be under […]
Simple Phase Shift Oscillator Circuit using a Single Transistor
An oscillator is like a special electronic circuit. It makes electrical ups and downs, like waves on an ocean. These waves can be smooth and curvy or choppy. The circuit can control how fast frequency ups and downs happen. There are many kinds of oscillator circuits. One type called an RC oscillator uses a special […]
Adjustable Voltage, Current Power Supply Circuit Using Transistor 2N3055
This post shows you how to build a powerful adjustable power supply circuit. This circuit lets you change both the voltage and amperage it provides, making it super versatile for many electronics projects. It uses a common transistor 2N3055 and other basic parts. Building circuits with high voltage can be dangerous. Only do this with […]
220V Over Under Voltage Cut Off Circuit Using Transistors
You might be surprised to learn that an effective circuit for the mentioned protections can be constructed using just a pair of transistors and a few other passive components. What is a 220V Over Under Voltage Cut Off Circuit: A 220V over under voltage cutoff circuit is a protective electronic circuit designed to monitor the […]