This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC.
Two-stage 12 V common-emitter small-signal amplifier using MMBT2222A transistors, with a 14.0 MHz single-tuned output stage, fixed 510 ohm load, and RF test headers for input, interstage monitoring, and output.
Transformer-isolated rectifier, 7812 regulated 12 V supply, and 2N2222 single-transistor audio amplifier PCB recreated from the reference circuit image.
High-fidelity high-voltage amplifier for 2.5 nF ultrasonic piezo transducer, 10 V input, gain 40, up to 400 V peak single-ended output from 220 VAC with 3 A peak overcurrent protection and China-preferred component sourcing.
12 V 2N2222 common-emitter audio amplifier PCB based on the uploaded reference diagram, with AC input coupling, adjustable base bias, emitter bypass, collector load, output coupling capacitor, and speaker connector.
50-W Stereo Analog Input Class-D Audio Amplifier with a small number of external components mounted on a circuit board that can be used to directly drive a speaker with an external analog audio source as the input; can also be configured as a 100-W, Class-D mono audio amplifier in PBTL mode.
Compact 5 V-12 V mono audio amplifier with stereo 3.5 mm summed input, 10 kOhm log volume control, LM386 power stage, speaker output, power LED, and 2-layer 50 mm x 50 mm layout target.
50-W Stereo Analog Input Class-D Audio Amplifier with a small number of external components mounted on a circuit board that can be used to directly drive a speaker with an external analog audio source as the input; can also be configured as a 100-W, Class-D mono audio amplifier in PBTL mode.
50-W Stereo Analog Input Class-D Audio Amplifier with a small number of external components mounted on a circuit board that can be used to directly drive a speaker with an external analog audio source as the input; can also be configured as a 100-W, Class-D mono audio amplifier in PBTL mode.
