I want to make my own audio amplifier with the specs of
100Watts , (stereo) 50Wmono 50WSstereo mic input equalizer (bass mid treble) (high mid low) Transistorized ( i must not use IC chips) maybe 20khz-20khz. (i dont know, what can you suggest best?)
i have no idea how to start it, can anybody help me with it, im not an engineer yet. i just want to make my own amp. ^_^ . it would be helpful if you can send me an schematic diagram and other useful stuffs. thanks in advance.
this is very big circuit ( mic pre amp, head pre amp, pre driver, various type audio mixer, tone control, after tone cont driver, power amp and power supply circuits etc). can you build it by proper way.
Buy one from ebay cost you less $19.00 much easier weve all given up with that idea of building new amplifiers Why ?? (There’s your answer Ebay ) hence why National Technics and all the well known well made amplifier companies have gone bust (Closed their doors ) No Info No Nothing
Clever huh Only one slight problem No ones going to service or repair them for you for under £50.00 to £80.00 in the Uk Why ?? (because it took us over 25 to 30 years to become professionals ) That’s going to be your next answer
And what’s the next answer going to be the same for designers because they too are not going to sit and design something for you for less than £50 to £80.00 per hour Why is that (because they too didn’t go to university and college to sit and design for someone to sell top grade high quality amplifiers for the likes of £19.00 ) in other words penuts
That’s why
So they not looking to clever there either are they
Finally that’s why all your shops are closing and they too are sick to death of working their guts out for peanuts as well
So now you really have got problems haven’t you So there you go that’s what you get for no investment That’s what you get for cheap and lovely ending There’s all the information on the net
Now you can all go way and make them yourselves because you are so clever to clever for us you see
ha ha ha ha ha cool joke love it At last and what makes this even funnier is they going to stop your dole money as well ha ha ha ha ha
Love it even more
And that spells the end of Daves life long gaming periods sitting on his backside, thinking but not washing and bathing , living like a flipping pigh THAT THE DOLE OFFICE ARE GOING TO LET HIM GET AWAY WITH NOT WORKING, ANNOYING LOADS AND LOADS OF PEOPLE
AND ALSO LITTLE MARK ROLPHS BILLGERANT ATTITUDE WHEN YOU TELL HIM TO GO WAY AND LEARN SOMETHING whilst he sits arguing the toss with you like many other people too I just love it
Classic ending
Correct again that’s exactly what they have done Cant say I blame them or the teachers for leaving you high and dry at colleges universities as well Sick of the attitudes , sick of the working conditions , sick of the pay , sick of the long hours , sick to death of the no pensions story sick to death of the abuse , violent attitudes the lot , sick to death of not being paid on time , sick to death of the poor quality standards and the high demands they are expected to meet with ultra low budgets Cant be done anymore
Hence most people are now leaving this country Its camer blairy ruined
Expecting people to sit here and do this for nothing Any idea how long it takes to put something like this together ? Try apprximatlley a month or so Just to sit down and get to the stage of biulding this
You dont honestly expect people to do this on a non paid basis do you ?? Your are Nuts !! Who pays the devlopment costs Who pays for the matarials Who pays the bills Who Pays for the parts The time The PCB The sofwtare The lot
Open to ideas from you cant quite see how you think this is going to work myself
I have a dream that one day this nation will rise up and live out the true meaning of its creed: "We hold these truths to be self-evident: that all men are created equal." I have a dream that one day on the red hills of Georgia the sons of former slaves and the sons of former slave-owners will be able to sit down together at a table of brotherhood. I have a dream that one day even the state of Mississippi, a desert state, sweltering with the heat of injustice and oppression, will be transformed into an oasis of freedom and justice. I have a dream that my four children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character. I have a dream today.
I had one too terrible it was !! That one day when they introdiced the internet and placed this into public hands That all hell would errupt That the world would go bankrupt and that riotes and looting would start
Gosh fancy that I must have been seeing into the future !!
You can google: 100W Audio Amplifier project which will give you many designs. But if you have no idea how to start, I would suggest that you gain a knowledge of basic electronics first. A 100 Watt amplifier is a BIG project for a beginner.
By taking a bit of time to read up on the basics of electronics, you will progressively gain knowledge and ideas of what is possible, and soon be able to design and make circuits work (almost) the first time. (Just like we all do (sometimes). ;-)
To obtain an understanding of electronics, the following sites offer free courses of instruction and advice for beginners. Have look at a few, and discover which one(s) suit your approach. Start with simple projects and work your way up.
We will always be here to offer the best advice and wisdom we can. Many sites have a user forum for asking questions on any technical aspect.
Old (allegedly Chinese) proverb: “A journey of a thousand miles begins with but a single step.” ---------- www.learnabout-electronics.org/index.php - Descriptions of components and principles, good diagrams, animations, & fault-finding techniques
Obviously does have an idea on how to start frank that obvious !!
Quote "this is very big circuit ( mic pre amp, head pre amp, pre driver, various type audio mixer, tone control, after tone cont driver, power amp and power supply circuits etc). can you build it by proper way "
In other words he knows exactly how to put this together otherwise he wouldn’t be mentioning 1: mic [re amp 2: head pre amp 3: pre driver 4: tone cont driver 5: mixer
In no uncertain terms he thinks you are stupid enough to put this altogether free of charge ,your time your investments ,your knowledge whilst he build this manufactures this and you wont get a penny from it whilst the likes of anyone stupid enough to do this on this scale sit-in shit hole , with every tom dick and Harry expecting you pay bills etc rents etc rates etc , never mind anything else whilst he reaps the rewards for doing sweat Fanny Adams Probably haven’t done a stitch of work through his entire life time
Even manager who knows nothing at all working for a charity organization gets paid in excess of £25K a year Come off it wake up Frank
What’s is he on !! Hes not working for communist china buy any chance is he ??
Perhaps he thinks hes Mao Tse-tung " Shuttup or I punish"
If he wants to come up with an legally binding signed order for1000 60% up front I might be interested
Hasent heard this one iether has he "Money talks bulshit walks " in other words Suck my ring piece pal You kiss Uranus
On your bike Go and teach your mother how to suck eggs In your dreams
I can think of lot more but I dont want to be too rude not just yet anyway
I dont even do that for my best friends not that Ive got any Only time they ring me is when they want something and when theres a favour involved except for pne or four good pals who have stood by me
Cant say the same for the rest of them only to eager to stitch me up Even people Ive known for years and worked for loyaly as well who have always made money out of what Ive done even them Trade too" Filth the lot of them"
If he has no idea then how does he know how to break this down into operational blocks ? Exactly so he knows how to go about this then doesn’t he and there is the net which he can use to look each block up cant he
There you go but if you choose to believe that then you believe anything where as I know when someone is trying to take the Mickey out of people practically straight away and he’s a mickey taker
As I said you can do that for nothing if you want too I wont I may put projects up on this site for nothing but it isn’t for nothing if you think about this Its to attract customers and prospective clients who want something done and want someone to make that for them just the same as anyone else who advertises on this site They don’t do this for nothing
No one does The governments of countries don’t allow you to live for free They don’t even bury you for free
See below even China don’t do work for nothing You don’t work for nothing ,and no one else does, neither do people pay bills with nothing
That simple
Example one day ago advertising for work PCB factory
Good idea as far I’m concerned I’ve no objection to this at all good luck to them that’s taking the initiative to build up on business and create work a dam site more than what the governments are doing at the moment or the unemployment offices
"We China pcb manufacturer want to expand our market in foreign countries, if you are interested in please visit our http://www.szbominelec.com and contact me"
Posted the other day I see “Manure Groot beck Collin” , hasn’t said anything at all Wonder why that is then ?? Could he be he has a side deal going on with them or has seen a cheap short cut to what he wants done Aaaah !!
Finally Frank there is an old age saying which is just so true you know
"You pay peanuts or next to nothing or nothing you get monkey’s” And boy have you got some monkey's in business these days Hence your poor economy and one business going bankrupt after another must be because they pay nothing or expect everything for nothing
✨ The discussion centers on designing a 100W transistor audio amplifier with stereo output (50W per channel), microphone input, and a 3-band equalizer (bass, mid, treble). The original poster requests a schematic without integrated circuits, covering a frequency range approximately 20Hz to 20kHz. Responses include a direct link to a 100W transistor amplifier schematic using MJ15003 and MJ15004 transistors. Contributors highlight the complexity of such a project for beginners, emphasizing the need for foundational electronics knowledge before attempting a large-scale design involving multiple stages: microphone preamplifier, headphone preamplifier, pre-driver, audio mixer, tone control, power amplifier, and power supply. Suggestions include studying basic electronics through free online courses and starting with simpler projects. Some responses note the practicality of purchasing ready-made amplifiers due to cost and design challenges. The discussion also touches on the difficulty of obtaining free professional design help and the value of investing time in learning electronics fundamentals. Generated by the language model.
TL;DR: Building a 100 W transistor audio amp is ambitious, and “A 100 Watt amplifier is a BIG project for a beginner.” [Elektroda, Frank Bushnell, post #21668585]
Why it matters: This FAQ helps first‑time builders decide whether to DIY, what blocks are required, and where to find a 100 W schematic, mic input, and 3‑band EQ guidance.
What does a 100 W stereo (2×50 W) transistor amplifier project actually include?
You’ll build multiple stages: mic preamp, head preamp, pre‑driver, mixer, tone control, driver, power amp, and a power supply. Each stage needs biasing, noise control, and gain budgeting. Plan PCB layout, grounding, and heat sinking early. Keep channels identical for stereo balance. This is a large, multi‑week undertaking if you’re new. [Elektroda, iqbal Khan, post #21668582]
Is this a good first project if I’m just starting electronics?
No. Learn fundamentals first, then attempt smaller amps to build skills. Quoting an expert reply: “A 100 Watt amplifier is a BIG project for a beginner.” Start with low‑power headphone or 10 W modules to practice biasing and troubleshooting. That foundation saves parts and time later. [Elektroda, Frank Bushnell, post #21668585]
Where can I see a 100 W all‑transistor schematic?
The thread includes a reference schematic link using MJ15003/MJ15004 output transistors. Review it to understand typical stages, protection, and bias networks. Use it as a study aid before designing or building your own. Check transistor pinouts and safe operating area if you replicate it. [Elektroda, Mark Harrington, post #21668579]
How do I add a microphone input without using ICs?
Use a discrete mic preamp stage ahead of the main preamp. Design for appropriate gain and noise performance, and include input impedance suited to your mic type. Add DC blocking, filtering, and shielding. Route mic grounds carefully to avoid hum. Then mix the mic path with line sources before tone control. [Elektroda, iqbal Khan, post #21668582]
What is a 3‑band equalizer (bass/mid/treble) in this context?
A 3‑band EQ is a tone‑control network that lets you boost or cut low, mid, and high frequencies before the power amp. In discrete builds, it sits after preamps and before the driver stage. Choose component values to set corner frequencies, and verify with a signal generator and scope. [Elektroda, Bong Chongki, post #21668578]
How do I break the design into manageable steps?
Prototype each block separately (mic pre, preamp, tone control, driver/power).
Verify gain, noise, and frequency response per block, then add the mixer.
I typed 20kHz–20kHz by mistake. What frequency range should I target?
The thread highlights that 20k–20k was a typo. Align your design goal to the audible band rather than a zero‑width band. Confirm your intended low‑frequency extension, then choose coupling and feedback components accordingly. Recheck test equipment bandwidth and calibration. [Elektroda, Steve Lawson, post #21668580]
Could buying an amp be cheaper than building this?
Yes. A reply notes you can buy a finished amplifier inexpensively online. DIY teaches a lot, but parts, tools, time, and rework can exceed a bargain unit’s price. Consider your goals: learning versus immediate use. Factor serviceability and documentation into your choice. [Elektroda, Mark Harrington, post #21668583]
What is a ‘pre‑driver’ or ‘driver’ stage in a power amp?
The pre‑driver boosts voltage and prepares the signal for the driver, which supplies current to control the output transistors. Together, they set open‑loop gain, bandwidth, and stability. Correct biasing prevents crossover distortion and thermal runaway in the output stage. [Elektroda, iqbal Khan, post #21668582]
What skills or study path should I follow before attempting 100 W?
Study component behavior, biasing, feedback, grounding, and audio measurement. Work through beginner courses and build smaller circuits first. As one mentor advises, read basics so circuits work almost the first time you power them. Practice measurement and fault‑finding on low‑risk builds. [Elektroda, Frank Bushnell, post #21668585]
What mixer functionality do I need for mic plus line sources?
You need level controls and summing before the tone control. Place the mic preamp first, then use a passive or active mix node to combine sources. Maintain headroom to prevent clipping, and include attenuation for hot inputs. Keep cables short to reduce noise. [Elektroda, iqbal Khan, post #21668582]
Any edge cases I should plan for during testing?
Yes. Large discrete amps can oscillate or burn output devices if bias or wiring is wrong. Use current‑limited bench supplies and a dim‑bulb tester on first power‑up. Verify each block in isolation to limit damage. Document changes before full‑power tests. [Elektroda, Frank Bushnell, post #21668585]
Can I get community help if I get stuck?
Yes. The thread shows multiple contributors offering humor, cautions, and resources. Ask specific questions with schematics, voltages, and scope captures. Be ready to learn and iterate. Respect time and feedback to keep conversations productive. [Elektroda, Frank Bushnell, post #21668587]
What did the original requester actually want to build?
They asked for a 100 W stereo amplifier (2×50 W), with a microphone input, 3‑band equalizer, and fully transistorized design. They sought schematics and guidance to begin. Use their spec as a starting brief if you replicate the project goals. [Elektroda, Bong Chongki, post #21668578]
Is there a quick reality check before I commit?
Count required blocks and your available tools. One reply lists mic pre, head pre, pre‑driver, various mixers, tone control, post‑tone driver, power amp, and PSU—seven plus stages. That scope demands time, test gear, and patience. Plan accordingly. [Elektroda, iqbal Khan, post #21668582]
Any closing perspective from the thread?
The discussion veers into cost and effort debates, plus a shared schematic link. Filter the noise, extract the requirements, and proceed stepwise. Document your build to simplify debugging and future upgrades. [Elektroda, Mark Harrington, post #21668579]
