Making an amplifier on a single transistor is quite simple. For this you need only one transistor, for example, pn2222 or any other analogue thereof; constant and variable resistors, resistance 10 kΩ each; capacitor with a capacity of 1 microfarad and more; plug to connect to the headphone jack; 1.5 W speaker and 50 Ohm coil resistance; two batteries, a total voltage of 3 V or 9 V crown.
Our audio power amplifier assumes turning on the transistor according to a common emitter circuit. The variable resistor is designed to accurately set the transistor's quiescent current. If the operating point is selected correctly, then the default transistor should be a voltage equal to half the power source.
But the correct amplifier under consideration on a single transistor is not quite correct, since in rest mode there is a significant current consumption from the power supply. However, the amplifier is relatively correct, since a speaker with a relatively high resistance is included in the collector circuit. If a speaker with a resistance of 4 ohms was turned on, the current consumption from the power source in the rest mode would increase significantly.
Негізгі бет The correct amplifier on one transistor
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