Imagine our voice is a tiny whisper going into a microphone. This Microphone Preamplifier Circuit using Two Transistors works like a small megaphone. It makes the whisper louder so the main amplifier can clearly boost our voice. Circuit Working: Parts List: Component Type Description Quantity Resistors(All resistors are 1/4 watt unless specified) 100k 1 120k […]
Transistor Circuits
Simple Transistor Tester Circuit
Transistors are small switches. But how to check if they work or what type they are? This Simple Transistor Tester Circuit is like a transistor checker. It is an easy DIY project which uses few parts. It tells us if transistor is good or bad and also shows if its NPN or PNP like two […]
Simple Two Transistors Amplifier Circuit using 1.5V Battery
This Simple Two Transistors Amplifier Circuit using 1.5V Battery works like loudspeaker for small sounds. It uses 2 small parts called transistors and 1.5V battery to make weak sound strong. It is simple mini amplifier which are good for small projects for making music sound better. Circuit Working: Parts List: Category Item Quantity Resistors (All […]
Simple Automatic Battery Charger Circuit using One Transistor
This post shows very easy way to make Simple Automatic Battery Charger Circuit using One Transistor and with few parts. This circuit charges battery by itself like small machine. It uses only one transistor, one resistor and one LED. Good for charging 9V battery where LED shows when charging. But this is basic charger with […]
Transistor 2N3055 Circuit with 1.5 Million High Gain
Transistor 2N3055 Circuit with 1.5 Million High Gain is like normal volume knob it can make sound more but not too much. If we want very loud like 1.5 million we need to trick it little bit. One way is it uses two transistors together like double volume knob and this is called the Darlington […]
Simple Adjustable Zener Diode Circuit
Think like small switch which controls how much voltage go through. Normal Zener diode is like one fixed switch which let electricity pass only when voltage goes above certain level. But this Simple Adjustable Zener Diode Circuit is like fancy dimmer switch. We can change voltage level using some parts like mostly one thing called […]