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Any small- pedal size guitar Power amplifier layout?

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  • #31
    The TPA3116 boards are pretty cheap - I've seen them sold 'cased' (by Breeze Audio) at around £25 or less. 50W+50W but they may be configured to 100W mono. Banana outputs but connections to the board are by flying leads so should be swappable to 1/4". You still need a hefty PSU. I got a 24v 7A unit the size of a laptop supply but intended for a printer - cost about £1 from a boot sale.

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    • #32
      Originally posted by olddawg View Post
      Quilter MicroBlock 45 45W Guitar Amp Head https://www.amazon.com/dp/B06XDYB3QG..._CmYcBb6RERWK0

      Yeah I was going to second that... the only issue is the power supply is larger than the pedal. It’s like a laptop supply and probably why they don’t show it. But it comes with the pedal for that price.
      The gent that I spoke with keeps the Quilter & the power supply at his cabinet.
      There really is no need to have it on the pedal board.

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      • #33
        Originally posted by J M Fahey View Post
        That said, it also has a "sweet spot" and I chose it to be around 6 or 7 Volume setting.
        Hi Juan Manuel, may I ask what is the main reason of this sweet spot in your SS amp?

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        • #34
          Finally I ordered an LM3886 board mono PCB

          https://www.ebay.com/itm/HiFi-LM3886...53.m2749.l2649

          with the appropriate rectifier board (i may use just two capacitors instead of four in order not to choke the amp so much).

          https://www.ebay.com/itm/Dual-Power-...53.m2749.l2649

          It seems an affordable and ok size wise solution.
          I think I have a +-25V transformer somewhere. Maybe it will be more like a small rack.
          There is this schematic
          http://www.generalguitargadgets.com/...lm3886_amp.pdf
          and excellent advice and ideas in here
          Elliott Sound Products - The Audio Pages (Main Index).
          I will follow the current - mixed mode feedback in order to raise the output impedance.
          As I said No need for preamps etc.

          Thanks for the help and the ideas

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          • #35
            Don't forget the heatsink requirements.

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            • #36
              Out of interest I bought one of these;

              https://www.ebay.co.uk/itm/TPA3116-D...72.m2749.l2649

              It's ridiculous. Just finished a 20-minute session and my ears are ringing like hell - this thing is damn loud and barely gets warm. I used a tube preamp pedal straight into it and got a really big sound with plenty of low-end thump-in-the-chest. If there's one drawback it's that there's a steep fall-off in the top-end, possibly caused by the excessive filtering necessary for a digital amp. Easily corrected by turning up the treble on the preamp. It's also susceptible to noise and needs an enclosure rather than sitting on a sheet of paper on my bench. So cheap it could be considered a consumable and you can buy 6 for the price of a single EL34.

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