100W Mono Amplifier.

Hello Friends, In this post I make 100 watt mono amplifier using a pair of 2SA1943 Transistors. which can deliver up to 80 watt output at 4Ω ±45V. For designing my PCB, I used EasyEda online software. Then I export the Gerber file (which you can download). And then I go to PCBWay for manufacturing my PCB. PCBWay are the largest PCB manufacturer in China. They offer Standard PCB, Advanced PCB, Rigid-Flex PCB, SMD-Stencil and PCB Assembly Service. Here you get, 100x100mm 2 Layer PCB only at $5, And processing time within 24 hours. And they distribute, worldwide. The more you order, the less price you have to pay.

You just need to upload the Gerber File, and select the quantity, color, silkscreen, thickness etc. Then select your country, and shipping method and then Pay. PCBWay will deliver your PCB within 7-10 days.

🎉 PCBWay 11th Badge Design Contest

Theme: “11 Years of Innovation and Beyond with PCBWay.”

Design Requirements: Your badge must include "PCBWay" and "11", and can use PCB, SMT/THT, or 3D‑printing techniques. A short design statement explaining its significance is required. 3dimprimante.com+11pcbway.com+11theengineeringknowledge.com+11

How to Enter:

Submit your badge design by post­ing in the comments on PCBWay’s contest page or by emailing sponsor@pcbway.com.

You can share on social media using #PCBWay11BadgeContest. pcbway.com+1theengineeringknowledge.com+1

Dates:

Submission window: March 3, 2025 – April 30, 2025

Winners announced: June 12, 2025 pcbway.com+1theengineeringknowledge.com+1

🏆 Prizes & Perks

Grand Prize: US $500 cash + $300 PCBWay coupon

Two Runner-Ups: $200 PCBWay coupon each

Most Creative Award: $200 coupon

Most Functional Award: $200 coupon

All entrants meeting guidelines receive:

Free prototyping of their badge

A $50 PCBWay coupon

Winning or standout designs may be featured by PCBWay and might even become the official 11th anniversary badge! embedds.com+11pcbway.com+11theengineeringknowledge.com+11

📌 What You Can Do Now

Design your badge following their guidelines (include “PCBWay” + “11” and a design statement).

Submit before April 30, 2025 via comments or email.

Alternatively, share on social media with #PCBWay11BadgeContest.

Watch for June 12, 2025 to see if you win!

After one week I received my PCB. You can see the PCB quality, it's awesome. I have ordered Black PCB. But you can choose your PCB color. PCBWay provides a total of 9 color solder masks - Green, Blue, Red, Purple, Black, White, Yellow, Matte Black, and Matte Green. On PCBWay you can get 100x100mm 2 Layer PCB only at $5. Maximum size PCB you can get 500x1100mm. And the maximum Layer is up to 14 Layers. And If you order PCB the first time at PCBWay, then you get a $5 discount coupon. So upload your Gerber today and get the best quality PCB.

Gerber File:- Gerber

PCB Layout & Schematic:- PDF

License:- ©Technical Mriganka. You can't use this PCB Layout and Gerber File for commercial purpose. You can use this PCB layout and Gerber file only for Educational and DIY projects.

Testing Method After Complete This Amplifier

Series light test:- After complete this board don't forget to series light test. When you will on this amplifier via series light, it glow for some time (1 - 2 sec). Then series light will turned off fully. If the series light will fully turned off, then check the voltages.

Check Voltages:- Bias volt 0.5V to 0.7V. Check Speaker Output and Audio Input voltage. Here you get no voltages 0.00V. If you get same voltages, then connect preamplifier to input and connect speaker to output.

Power Supply:- Recommended Transformer 30-0-30V to 40-0-40V, 5A-6A.