Any small- pedal size guitar Power amplifier layout?

[Mick Bailey]

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.

[Jazz P Bass]

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.

[Roberto]

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?

[tedsorvino]

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

[Mick Bailey]

Don't forget the heatsink requirements.

[Mick Bailey]

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.