Audio Amplifier using TDA2030

The audio power amplifier is the rite-of-passage analog build: it looks simple — one IC, a handful of passives — but getting clean, hum-free sound out of it teaches gain and feedback, decoupling, grounding, and thermal management. The TDA2030 is the ideal device for it: a dedicated audio power IC with built-in thermal and short-circuit protection, happy on a single 12 V supply. This project builds the datasheet application circuit on perfboard with a volume potentiometer, input coupling, feedback network setting the gain, and a finned heatsink bolted to the IC. An 8-ohm speaker connects through screw terminals. The report works through the datasheet values honestly — gain, supply limits, and the expected output power at 12 V — without inventing measured performance.

1. Audio from a phone or laptop enters through the volume potentiometer and an input coupling capacitor.
2. The TDA2030 amplifies the signal with gain fixed by the resistor feedback network, per the datasheet application circuit.
3. Supply decoupling capacitors keep the 12 V rail clean so the amplifier does not oscillate or hum.
4. The IC's output drives an 8-ohm speaker through screw terminals and a DC-blocking capacitor.
5. Heat from the power stage flows into the finned heatsink; the TDA2030's built-in thermal protection guards against overheating.
6. The student runs the scope procedure — sine input, raise the level to clipping, record gain and clean-output limit — and reports the observed values.

Tech stack:

• TDA2030 audio power IC
• Single 12 V DC supply
• Perfboard assembly
• Volume potentiometer
• 8-ohm speaker
• Oscilloscope (test procedure)
• Datasheet application circuit

• [TDA2030 power stage] A genuine audio power IC with built-in thermal shutdown and short-circuit protection, mounted on a finned aluminium heatsink for sustained operation.
• [Single 12 V supply] Runs from one common 12 V DC adapter — no split supply needed — following the datasheet's single-supply application circuit.
• [Volume control] A front-panel potentiometer sets the input level, so the amplifier works straight from a phone or laptop headphone output.
• [Feedback-set gain] The resistor feedback network fixes the voltage gain per the datasheet design, and the report shows the gain calculation.
• [Decoupling and grounding] Supply decoupling capacitors and a star-ground layout keep hum and motorboating out — the build practices that separate student boards from noisy ones.
• [Screw-terminal speaker output] Standard terminals connect an 8-ohm speaker securely, with an output coupling capacitor per the single-supply design.
• [Scope-based test procedure] A documented procedure measures gain, clipping point and frequency behavior with an oscilloscope, so every number in the report is observed by the student.

• Working TDA2030 audio amplifier prototype with speaker
• Schematic and perfboard wiring documentation
• Datasheet-based design notes (gain, supply, thermal)
• Oscilloscope test procedure manual
• Project report PDF (amplifier theory, feedback, test results template)
• PPT presentation for final review
• Viva Q&A preparation document

• The ~6 W output figure is a design target derived from datasheet conditions at 12 V — actual clean power is whatever the student measures in the scope procedure; no measured figure is claimed here.
• Single channel (mono) only; stereo needs a second identical build.
• 12 V single supply limits headroom — it will clip earlier than a split-supply version, which the report explains.
• THD, frequency response and SNR are not claimed — the student measures what their instruments allow and reports it.
• It is a learning build, not a hi-fi product — expect audible limits at full volume.