Schematic Power Amplifier and Layout

Circuit 2N2222 for Headphone amplifier This circuit can source about 500mA continuously, You built a 2 transistor project and it worked great, but now it has stopped working. You decide the transistor may be faulty.

Simple Audio Headphone amp circuit using 1458 Simple Audio amp circuit for Headphone using 1458

voltage controlled oscillator vco circuit diagram using lm358

Power Amplifier Circuit Supplier High Quality 50W Audio Amplifier Circuit using STK0050II

Simple Vcsel Laser Tester circuit using 74HC14, 2N2222, 7805