Power Supplies & Protection
Transformers, rectification, filtering, regulation and protection circuits, and how to prove which stage failed.
Sound Equipment Repair Course · Amps, mixers & speakers
Stop paying the shop.Fix your audio gear yourself.
Learn to diagnose and repair amplifiers, mixers, speakers and powered audio equipment step by step. Trace the signal, test the power supply and replace only what is actually faulty.
Built for musicians, DJs, audio enthusiasts and hands-on technicians who want a repeatable repair method.
Get instant access — $29.99 USD
One-time payment · No subscription · Instant access after checkout
4
Levels
2
Bonuses
2
Reference guides
- Secure checkout
- Instant access
- 7-day guarantee
Find your problem
What is your sound gear doing?
Tap what your equipment is doing. See the usual suspects and where the course teaches you to test them.
Nothing lights up or it shuts off at once
- Blown mains fuse or a bad power cord
- Failed power supply or rectifier
- Shorted output stage
- Protection circuit latched
Where the course covers it
Power Supplies, Troubleshooting and the optional Dead Unit, Repeated Fuse Failure & Protection Mode Diagnostic System.
See the full course package →A constant hum or buzz through the speakers
- Filter capacitors worn out
- Ground loops or a bad ground connection
- Power supply ripple
- Shielding or cable faults
Where the course covers it
Signal Tracing, Power Supply Check and the optional Hum, Buzz, Distortion Fault Elimination Guide.
See the full course package →Sound is harsh, fuzzy or crackles
- Dirty or worn potentiometers and switches
- Bias problems in the output stage
- Failing coupling capacitors
- Damaged speaker cone or coil
Where the course covers it
Audio Power Amplifier Repair, Mixer & Console Repair and the optional fault elimination guide.
See the full course package →Only one side plays, or a channel cuts out
- Dirty jacks or connectors
- Failed input or driver stage
- Output transistor failure on one side
- Open signal path or solder joint
Where the course covers it
Signal Tracing and Systematic Repair Logic, with the diagnostic flowcharts.
See the full course package →Blown, rattling or silent speaker
- Burnt voice coil
- Torn surround or cone
- Crossover component failure
- Wiring or terminal faults
Where the course covers it
Speaker Repair modules and the optional Speaker, Subwoofer, Voice Coil & Crossover Rebuilding System.
See the full course package →The unit powers up then cuts out
- DC offset at the outputs
- Overheating or thermal faults
- Shorted output devices
- A faulty protection circuit
Where the course covers it
Protection circuit diagnostics and Professional Audio Repair Checklists.
See the full course package →
Why people switch
The guessing game vs. the diagnose-first way
Paying the shop & guessing
- Pay a repair shop before any work even starts
- Replace boards and transistors and hope one fixes it
- Leave your gear for weeks and risk it being written off
- Never learn why it failed
With this course
- Trace the signal and test the power supply first
- Replace only the component you have confirmed is faulty
- Repair at your own bench, on your own schedule
- Know the common mistakes that destroy gear
One hour of shop labor can cost more than this entire course.
The method
Follow the evidence, not guesses
The course teaches a professional repair order that keeps every diagnosis organized: symptom analysis, visual inspection, power supply check, signal tracing, component testing and repair verification.
- 01Make it safeUnplug the unit, discharge the capacitors and work on a clean, insulated bench.
- 02AnalyzeRecord the symptom, when it happens and what changed.
- 03InspectLook for burnt parts, bulging capacitors, cracked joints and damaged connectors.
- 04TraceCheck the power supply, then follow the signal stage by stage.
- 05RepairReplace or repair only the confirmed faulty component.
- 06VerifyRetest under load and confirm the original problem is gone.
One progressive course
Four levels. One clear path from beginner to master.
Move from safety and fundamentals to master-level diagnostics at your own pace. Each level builds on the last.
Beginner
Level 1 · Build the foundation
What sound equipment is, amplifier classes, mixers, powered systems, audio signal theory, resistors and capacitors, and your first inspections and continuity tests.
Professional
Level 2 · Troubleshoot like a pro
The six-step professional troubleshooting method, equipment setup, schematics, power supplies, audio power amplifier repair, speaker repair and mixer and console repair.
Expert
Level 3 · Repair at component level
Frequency response, bias adjustment, junction testing, digital audio paths, firmware issues, intermittent faults, thermal testing and harmonic analysis.
Master
Level 4 · Diagnose any system
Systematic repair logic, diagnostic flowcharts, hidden failures, preventive repair, repair versus replacement and high-power amplifier repair.
What you learn
What is included in the Sound Equipment Repair Course
A complete, structured course covering amplifiers, mixers, speakers and digital audio equipment, together with practical checklists and reference guides.
Amplifier Repair
Class A, AB and D designs: output devices, driver stages, bias and thermal faults.
Mixers & Consoles
Faders, pots, switches, channel strips and noise problems on analog and digital mixers.
Speakers & Crossovers
Drivers, voice coils, cones, surrounds and crossover networks, from diagnosis to rebuild.
Signal Tracing & Diagnostics
Follow the signal path with test tools and find the exact stage that fails.
Digital Audio & DSP
Converters, firmware and digital signal paths, and how faults appear in modern gear.
- Everything inside, topic by topic
- Audio Signal Theory
- Resistors & Capacitors
- Power Supplies
- Rectification & Filtering
- Class A/AB Amplifiers
- Class D Amplifiers
- Output Stage Repair
- Bias Adjustment
- Mixers & Consoles
- Faders & Potentiometers
- Speakers & Drivers
- Voice Coil Repair
- Crossover Networks
- Digital Audio & DSP
- Signal Tracing
- Schematics
- Intermittent Faults
- Diagnostic Flowcharts
- Hidden Failures
- Preventive Repair
Your toolkit, explained: what to buy, in what order, and how to use it safely.
Get the course — $29.99 USD
Secure checkout · Instant access after payment
Your package
Bonus 1Included
Bonus 2Included
Complement 1Included
Complement 2Included
Everything you get — in one purchase
The full course plus two bonuses and two complementary guides, all in one purchase.
Complete Guide to Audio Components & Circuit Boards
A clear reference to the components and boards inside audio gear, so you can identify every part and understand what it does.
Common Sound Equipment Repair Mistakes & How to Avoid Them
The errors that destroy gear or waste money, and the habits that prevent them.
Power Supplies & Amplifier Circuits Repair Guide
A focused guide to the circuits behind most failures: power supplies and amplifier stages.
Professional Audio Repair Checklists
Step-by-step checklists that keep every repair organized from first inspection to final verification.
All 4 levels, 2 bonuses and 2 complementary guides are included in your $29.99 USD one-time payment.
Is it for you?
Who this course is for
Gear owners
Fix your own amps, mixers and speakers instead of paying for every fault.
Complete beginners
Start from zero with signal theory and basic components, then build your skills level by level.
Side-income repairers
Repair gear for musicians, bands and local customers with a structured, repeatable method.
Technicians wanting structure
A systematic diagnostic reference for faster, more consistent and more confident repairs.
Built-in safety
Technical safety comes first
Audio equipment can hold dangerous mains voltage and stored charge, even when unplugged. The course builds safe habits into every procedure, including knowing when to stop.
Mains voltage
Unplug the unit before opening it and never work on a live chassis unless the procedure requires it.
Stored charge
Large capacitors can hold a charge after power-off. Discharge them safely before touching anything.
Hot components
Heat sinks, output devices and resistors stay hot after use. Let them cool first.
Speaker output
Disconnect speakers before testing amplifiers to protect them from damaging surges.
Soldering safety
Use a stand, ventilate fumes and keep the iron away from cables and flammable material.
Personal protective equipment
Wear eye protection when soldering or cutting, and keep a tidy, insulated work area.
If a repair needs tools, equipment or experience you do not have, stop and consult a qualified technician. Always follow the manufacturer’s documentation for your exact model and the safety rules that apply where you work.
7-day money-back guarantee
Try the course with confidence. If it is not right for you, email us at planetebooks0@gmail.com within 7 days of your purchase with your order number and we will refund you, as long as the course materials have not been opened, accessed or downloaded.
To protect our digital content, the guarantee applies only to unopened purchases. Once any part of the purchase has been opened, accessed or downloaded, the sale is final. This does not affect any rights you may have under the consumer laws that apply in your location.
Your order
Complete Sound Equipment Repair Course package
All 4 levels, 2 bonuses and 2 complementary guides, plus exclusive add-ons you can include right now.
Sound Equipment Repair Course
- 4 levels: Beginner, Professional, Expert, Master
- Bonus: Audio Components & Circuit Boards Guide
- Bonus: Common Repair Mistakes Guide
- Power supply guide + professional checklists
$29.99
Add exclusive bonuses to your order
Optional add-ons, only $14.99 each. Check a box to add it.
Sound Equipment Repair Course$29.99
Total today$29.99
- Secure checkout
- Instant access after payment
- 7-day guarantee on unopened courses
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Payment options at checkout
Available payment methods are shown at checkout and may vary by country and device.
Instant access by email
Right after payment, your access link is sent to the email you enter at checkout.
Learn at your own pace
Study on your phone, tablet or computer, on your own schedule.
Questions
Frequently asked questions
How do I access the course after purchase?
Right after your payment is approved you get instant access. Your access link is sent to the email address you use at checkout and is also shown on your order confirmation page. If you do not see the email, check your spam and promotions folders.
Do I need experience?
No. Level 1 starts from zero with safety, tools and how the equipment works. Each level then builds on the previous one, so you can stop where you feel comfortable or keep going to master level.
What is included in the price?
The full Sound Equipment Repair Course with all 4 levels, 2 bonuses and 2 complementary reference guides. The optional add-ons shown in the order box are separate and cost $14.99 each.
What are the optional add-ons?
Three focused diagnostic guides you can add to your order with one click before checkout. They are optional: the course is complete without them.
Can I study on my phone?
Yes. You can study on a phone, tablet or computer, at your own pace and on your own schedule.
Is this a subscription?
No. It is a one-time payment. There are no recurring charges.
Does it cover every brand and model?
The course teaches methods and systems that apply across brands. Always check the manufacturer’s documentation for the exact model you are working on.
Will this guarantee a specific result or income?
No. This is educational material. Results depend on your tools, effort and the condition of the equipment, and no repair outcome or income is guaranteed.
What is your refund policy?
We offer a 7-day guarantee on unopened purchases. Email planetebooks0@gmail.com within 7 days of purchase with your order number, as long as the course materials have not been opened, accessed or downloaded. Once any part has been opened, accessed or downloaded, the sale is final. This does not affect any rights you may have under the consumer laws that apply in your location.
Who do I contact if I have a problem?
Email planetebooks0@gmail.com with your order number and we will help you.
Get the course — $29.99 USD
Self-paced course · One-time payment · Secure checkout
Audio equipment work involves mains voltage, stored charge, hot components and soldering. This educational material does not replace professional training or the manufacturer’s documentation for your equipment. No certification, income or specific repair result is guaranteed.