Transistor headphone amplifier ----- Transistor Headphone Amplifier

Here is a low-cost stereo amplifier that drives low impedance headphone devices, as shown in the drawings. This circuit uses several commonly used transistors (BC547, BC557) and passive components. Such as resistance, diodes and capacitors, etc. To drive the headphones, the circuit uses a push-pull circuit consisting of a preamplifier and NPN and PNP. The stereo preamplifier consists of transistors T1 and T6. The input signals used separately from left and right channels respectively. The zoomed left channel input signal is fed to a pseudoranding stage consisting of transistors T2, T3 to drive left channel headphones. Similarly, the right channel input signal is enlarged, which is fed to the pilot level composed of transistors T4, T5 to drive the right channel headset. When the circuit is powered in + 6V ~ + 12V, its output voltage can reach 100 to 200 mV. Since the circuit consumes low power, it is also possible to supply power with a + 9V PP3 battery. Install the drawing circuit on the PCB board and put it into the appropriate small box. Stereo headphones can be purchased from the electronic market. The component should be carefully welded to avoid dueling on the PCB board. After the circuit is installed, one + 9V PP3 battery can be used, and the circuit can be used. In the case of AC power. Any common regulator (+ 6 ~ + 12V100mA) can be used to power the circuit.

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