This is a simple and low-cost Solar Sensor Based Security Alarm Circuit using Transistors which uses a solar sensor for light sensing. The circuit gives alarm sound through the speaker when light level changes and it works mainly when darkness comes or when someone blocks light on the sensor. So we can use this circuit […]
Transistor Circuits
Automatic Light Sensor Buzzer Circuit using Transistors
A Automatic Light Sensor Buzzer Circuit using Transistors is a simple electronic project which gives alarm sound when light level changes. In this circuit, an LDR (Light Dependent Resistor) senses the surrounding light, and when the room becomes dark, the resistance of LDR increases and because of this, transistor stages switch ON one by one […]
Adjustable 4 LED Flasher Circuit using Transistors
This Adjustable 4 LED Flasher Circuit using Transistors is a simple and useful electronics project for beginners which uses two 2N2222 transistors, four LEDs, capacitors, resistors and one variable resistor for speed adjustment. The main purpose of this circuit is to flash four LEDs in an alternating pattern, two LEDs glow first and then the […]
External Current Booster Circuit using Transistor and MOSFET
First, every electronic project start small, but sometimes current is not enough, so many circuits work fine at 500mA, however real loads like motors, leds and power modules need more current, so instead of redesign full system, we can just boost current using a smart add-on circuit. Next, this External Current Booster Circuit using Transistor […]
Simple 12V Protection and Soft Start Circuit
There are few protection circuit which we have shown in our previous post, but this article is for Simple 12V Protection and Soft Start Circuit for 12V systems. It helps to protect our load from sudden high current and voltage spikes and also, it gives a smooth start when power turns ON, because of this, […]
24V 2A Zener Transistor Voltage Regulator Circuit
This article explain us about a simple 24V 2A Zener Transistor Voltage Regulator Circuit, which converts 230V AC into stable 24V DC output. Moreover, this circuit uses step down transformer, rectifier diodes, filter capacitors, Zener reference and power transistor. Also, this circuit gives good voltage stability even when load changes, because of this output voltage […]