Circuit diagrams and schematics - Electronic projects

For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous transistor such as the BC547B, the gain of the transistor is roughly equal to 40 [...]

This is Hifi transistor headphone amplifier circuit uses the principle enlarges current of the transistor at the beginning by use , 3 transistors. Which first perform be pre amp and next 2 again build model complementary which impedance of the circuit will that about 500 ohm and have amplifier rate 5 equal it give output [...]

Here is a simple amplifier for boosting the audio level from low-power sound cards or other audio sources driving small speakers like toys or small transistor radios. The circuit will deliver about 2 watts as shown. The parts are not critical and substitutions will usually work. The two 2.2 ohm resistors may be replaced with [...]