In this post we will understand about a simple power amplifier circuit using AC176 and AC126 type PNP germanium transistor in OTL (output transformer less) design. Also, this circuit gives audio power directly to speaker without output transformer, it is low voltage circuit and works with 9V battery. Therefore, the circuit design is easy and […]
Hobby Circuits
12V Battery Level Indicator Circuit using IC LM3914
The IC LM3914 based 12V Battery Level Indicator Circuit shows how much battery charge is left, also it works well with 12V battery-powered devices and helps prevent sudden power loss. IC LM3914 senses voltage and control 10 LEDs , it show in dot mode or bar mode and also it work with 3V to 25V […]
How to Build a LiPo Battery Charger Circuit
LiPo batteries are popular today because they are lightweight, store a large amount of energy and support recharging, however, we must charge them carefully and accurately. We need a special circuit to prevent overcharging because overcharging can damage a battery or cause a fire. Hence, this LiPo Battery Charger Circuit is simple to build and […]
Simple DIY Battery Charger Circuit using Center Tap Transformer
Simple DIY Battery Charger Circuit using Center Tap Transformer is a useful device, it fills power in rechargeable battery. Furthermore, this article show how to make easy DIY charger using center tap transformer which is good for charging lead acid battery; also it can charge any 12V battery and even a car battery. Circuit is […]
Smart Vehicle Headlight Brightness Controller Circuit
Smart Vehicle Headlight Brightness Controller Circuit is a cool auto system, it changes headlight brightness auto by checking outside light and also, it helps driver see better and safe at night or in tunnel. Circuit uses photo-transistor, potentiometer, diode, relay and audio transistor to check light and switch high and low beam easily. Circuit Working: […]
Building an FM Transmitter Circuit for Car Stereo
Building an FM Transmitter Circuit for Car Stereo is easy way to play music from phone, MP3 or Bluetooth on car FM radio, as it sends sound on FM frequency and car radio catches it like normal station. Also, circuit is simple to use and is good for playing music or podcast in car without […]