Dual LED Temperature Indicator Circuit light one LED when hot and other when cold. It uses IC LM35 temperature sensor, CA3130 op-amp and two BC547 transistors. IC 7805 change 9V to steady 5V and if there is 5V already then we can connect directly. IC LM35 gives 10mV more for every 1°C rise. Output goes […]
Headphone Amplifier Circuit using Transistors
Headphone Amplifier Circuit using Transistors make weak sound strong so headphones work well. This circuit is useful when sound is direct from source which is not loud or clear. In this post we talk about small 3V transistor amplifier for better sound. Circuit Working: Parts List: Component Type Value/Specification Quantity Resistors (All resistors are 1/4 […]
High Current Adjustable Regulator Circuit with 30V 3A Output
In this article IC LM723 chip controls the voltage. It give stable DC output, voltage and current adjustable. Output voltage range is 2V to 37V and up to 150mA and input is max 40V. High Current Adjustable Regulator Circuit with 30V 3A Output is good for lab supply and projects. With extra pass transistor it […]
High Current 12V Voltage Regulator Circuit using Transistor
Voltage regulators is very important in power supply. They keep voltage steady and even if input voltage changes or load changes. This circuit give steady 12V output with max 3A current. If current need more than 3A then it still works good for regulation. High Current 12V Voltage Regulator Circuit using Transistor give steady 12V […]
Simple Voltage Splitter Circuit using uA741 Op-Amp
This Simple Voltage Splitter Circuit using uA741 Op-Amp is a useful and easy project to make. It split one power supply to two equal parts and make virtual ground in middle. Circuit is good for project that need two power supplies but have only one power source. Current depends on op-amp specifications. Circuit is good […]
Simple 12V Boost Converter Circuit using IC LM2698
Simple 12V Boost Converter Circuit using IC LM2698 make output voltage higher than input. LM2698 IC have switch inside and can handle 18V and 1.35A with 0.2Ω. Input voltage 2.2V to 17V and output is 2.2V to 17V. Keep voltage steady even if input changes. Circuit is good for many input voltages and battery devices. […]