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Amplifier project

Discussion in 'Audio' started by Wayne Phillips, Jan 14, 2018.

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  1. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    Many many years..this amplifier project was under way.. as I needed a power amp.

    I wanted 300w per channel with plenty of saftey circuits..from inrush protection to dc fail safe etc etc.. even added bridge mode!


    So rooting round the pile of odds and ends was a 1000va transformer that would do the job just right..next xlr sockets and speakon sockets all in reach. Then more digging to get a robust case and heatsink.

    I designed the circuit on note pad with a few tweeks here and there as things did not look right.

    So after pcb lay out and dip followed by fitting all the parts. The dc protection was an idea of my.


    So who else has built there own amp..
     

    Attached Files:

  2. WHONOES

    WHONOES

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    May 20, 2017
    Me. Built plenty over the years.
     
  3. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Me, too, both professionally and personal. That's quite a beast. Schematic?

    ak
     
    Wayne Phillips likes this.
  4. WHONOES

    WHONOES

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    May 20, 2017
    Bent quite a few too. Good fun though. Always something to learn.
     
    Wayne Phillips likes this.
  5. BobK

    BobK

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    Jan 5, 2010
    I have never built one with significant power (like typically < 1W.) Get the urge to do so every now and then, and then I look at Ebay. sigh...

    Bob
     
  6. Bluejets

    Bluejets

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    Oct 5, 2014
    In the 60's I copied a circuit and made my own stereo amp (valve) Elvis never sounded so good. Nowadays, Ebay , just like Bob, too easy and finished product way cheaper than just the cost of the chips.
     
    Wayne Phillips likes this.
  7. Chemelec

    Chemelec

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    Jul 12, 2016
    Many of them, But the largest I built was 100 Watts per channel.
    Universal Tiger Amp, from Popular Electronics, Many Years Ago.
    Shakes my Living Room Pretty Good.
     
    Last edited: Jan 27, 2018
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  8. AnalogKid

    AnalogKid

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    PE and the Tiger series of amps completely ruled the 70's. Glory Days.

    ak
     
    Wayne Phillips likes this.
  9. Chemelec

    Chemelec

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    Jul 12, 2016
    I still have those popular Electronic magazines.
     
  10. AnalogKid

    AnalogKid

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    Jun 10, 2015
    So do I. While in high school in the 60's I inherited a complete collection of PE, with some intermittent RE and EW sprinkled in. Last year I found a magazine archive site with *everything*, including complete mag collections from the 30'3 and 40's. Love that old history stuff. Downloaded about 30 GB. Now my old friends keep me happy on long plane rides. You can work backwards from here:

    http://americanradiohistory.com/Popular-Electronics-Guide.htm

    ak
     
    Peter Mortensen likes this.
  11. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Are you saying Bob is easy?
     
  12. BobK

    BobK

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    I resemble that remark!

    Bob
     
  13. WHONOES

    WHONOES

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    100W is a walk in the park.
     
    Wayne Phillips likes this.
  14. Wayne Phillips

    Wayne Phillips

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    Jan 7, 2018
    Yes on line is all to easy to buy kits and sticking it altogther..but that is far to easy.


    Building it from start to finished amplifier is a different matter..you have to work it all out and hope your math is right..then stand back and power it up!

    My own amplifier can do 300w and 600w in bridge mode stable.

    Have fun out there when building your monster amps..

    I was asked to build a 800w mono block mosfet amp once but the cost of the fet's put them off!
     
  15. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018

    Thanks..the main amp board is all on one board..and the protection circuit can be seen at the top of the photo with the relay in view.

    Has for the schematic...mmm well, wink...

    It has straight forwards tail balanced input pair and current mirror vas stage with emitter follower outpur stage with short circuit that steals the drive voltage should it suffer a s/c.

    The protection is something I worked on for about 3 weeks till it done the job! (Bit here and there.

    Most amps around seem to roast to death instead of total shut down and I did not want this one to fall in to that bracket!..

    Well from time to time it is still in use for local music party's..and it's 20yrs old!
     
  16. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    If you look about you may get a circuit for high powered amps..

    I'd for get them so called ebay amp kits that claim x y z watts on very under ratted supply lines.
     
  17. Wayne Phillips

    Wayne Phillips

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    Jan 7, 2018
    Where abouts have my post been moved to?
     
    Last edited: Feb 18, 2018
  18. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,309
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    Jan 21, 2010
    As far as I can tell your last two posts in this thread are the one on Jan 30 and this one today.

    If you have a look at the list of your posts, you may find something. You have posted in a similar thread, did you confuse the two of them?
     
  19. Andrew Lebon

    Andrew Lebon

    2
    1
    Feb 18, 2018
    Hello Wayne
    greetings short circuit protection and over temprature protection is must

    warm regards
    Andrew
     
    Wayne Phillips likes this.
  20. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    These day's amplifiers have moved in to switch mode power supplys and there for large transformers are being faded out.
     
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