2.1 Audio Amplifier Board | Version 2.0 | with TDA7377 IC DIY | SekhoHub

Description

The TDA7377 is a dual/quad bridge power amplifier IC designed primarily for car audio applications. It comes in a 15-pin Multiwatt package and can deliver high output power while maintaining low distortion.

It operates from a single supply voltage (recommended 12V – 18V, maximum up to 18V) and is capable of driving 2 to 4 channels depending on the configuration.

This is a 2.1 audio amplifier board. This board can play up to 2×15+30-watt speakers easily.

I used a TDA7377 IC and a 0-12 3 amp transformer for this project.

Materials for the Project.

Notes & clarifications (important)

• Capacitor values formatting: I interpreted ambiguous entries as standard shorthand: 224→0.022 µF, 103→0.01 µF, 104→0.1 µF, 472→0.0047 µF, 682→0.0068 µF, 473→0.047 µF. If you meant different units (e.g., nF vs µF), tell me and I’ll correct.

• Electrolytic voltage rating: 2200 µF are listed as 25 V — OK for a 12–18 V car system; for reliability choose 35 V if your supply can spike above 25 V.

• Diode selection: 6A4 is an older name — 1N540x family is commonly available (1N5404 = 3 A, so choose a 6 A part like MBR3060 or similar Schottky if you want lower drop). For bridge rectifier, choose parts rated for the expected current and surge.

• IC footprints: TDA7377 is Multiwatt15; ensure PCB footprint matches.

• Thermal: TDA7377 dissipates heat — prepare PCB copper area and/or heatsink. Add thermal vias if using a 2-layer board.

• Audio ground layout: Use a star ground or split analog/power ground to avoid hum.

Suggested typical part numbers / equivalents (quick reference)

• TDA7377 — original ST TDA7377A (Multiwatt15)

• 4558 — NE4558, JRC4558, or RC4558 (DIP-8)

• 7812 — LM7812 / 7812CT (TO-220)

• 2200 µF 25V — Panasonic FM / Rubycon ZL series (low ESR recommended)

• 0.1 µF (104) — 10 nF? (no — 104 = 0.1 µF) — use X7R 50V ceramics

• Film caps (472/682/473/224) — Polyester (Mylar) or polypropylene for audio (better tone) — WIMA or similar for best audio performance

• 6A4 diode — use an appropriate 6 A rectifier (e.g., SK6A or similar) or Schottky rated for power

• LED — 3 mm / 5 mm standard

• Connectors — Phoenix/Euroblock or screw terminal blocks for speakers/power

Ready-to-use summary (for your website post)

• Clean BOM in table form (above) — perfect for publication.

• I can convert this into:

  • CSV / Excel for suppliers,

  • A printable shopping list,

  • Or add direct buy links (Amazon, DigiKey, Mouser, AliExpress, and/or local Pakistan suppliers like IndustryParts / Techmanistan etc.).

Key Features:

• Output Power:

  • 2 × 30W in stereo configuration (at 4Ω load, 14.4V supply, THD = 10%)

  • 4 × 6W in quad bridge mode (at 4Ω load)

• Low Distortion: THD typically below 0.1%

• Mute and Standby Functions: Controlled through logic pins, making it suitable for automotive and audio applications.

• Short-circuit Protection: Built-in thermal shutdown and overload protection for reliability.

• Wide Operating Voltage Range: 8V to 18V supply.

• High Efficiency: Due to class AB amplifier design with good thermal performance.

Applications:

• Car stereo amplifiers

• DIY home audio amplifiers

• Portable speaker systems

• TV and multimedia sound systems

Pin Configuration (15-Pin Multiwatt):

1. Non-Inverting Input (Channel 1)

2. Inverting Input (Channel 1)

3. Non-Inverting Input (Channel 2)

4. Inverting Input (Channel 2)

5. Standby/Mute Control

6. Inverting Input (Channel 3)

7. Non-Inverting Input (Channel 3)

8. Ground

9. Inverting Input (Channel 4)

10. Non-Inverting Input (Channel 4)

11. SVR (Supply Voltage Rejection)

12. Output (Channel 4)

13. Output (Channel 3)

14. Output (Channel 2)

15. Output (Channel 1)

Advantages:

• Easy to implement in car or home audio circuits.

• Built-in protections reduce external component needs.

• Delivers decent output power for mid-range audio applications.

If you want to make this project, please watch the video.

Download Gerbers