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
220V Emergency Light Circuit without Transformer
Like our previous tutorial on emergency light circuit, here is another post on 220V Emergency Light Circuit without Transformer. Today, power cut is common problem, so emergency light is very useful, as it gives light when mains supply is OFF. Usually, emergency lights use transformers, but transformers increase the cost and size of the circuit; […]
Easy Emergency Light Circuit using Transistors
Power cuts can occur at any time, causing the room to become dark and uncomfortable, hence, this small circuit provides instant lighting during a power failure without requiring any manual switch operation. Then light turns ON automatically and this happens because of simple and Easy Emergency Light Circuit using Transistors. Now, the circuit works like […]
7V Backup Power Supply UPS Circuit
Many small electronic circuits need continuous power supply but sometimes AC mains power fails, because of this our device stops working. Therefore, we need a small Uninterruptible Power Supply. If we need 5V to 7V power supply with about 0.5A current then this 7V Backup Power Supply UPS Circuit is a good option as it […]
5V High Current Power Supply Circuit using IC 7805
The 7805 is a popular voltage regulator IC because it provides a fixed 5V output and offers easy operation; however, it can deliver only about 1A of output current, which limits its use in high current applications. Sometimes we need more current for our motors, relays or microcontroller project with many modules, so to solve […]
AC to DC Bridge Voltage Doubler Power Supply Circuit
The AC to DC bridge voltage doubler is a simple power supply circuit that converts a low AC input voltage into a higher DC output voltage; for example, a 9 V AC input can produce approximately 18 V to 25 V DC, depending on the load and circuit components. Therefore, this circuit is useful when […]