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So In case anyone else runs into this problem, they changed the design of these boards recently to stop blowing the amps. They have restricted the output to 6db, however they have included 2 jumpers on the back of the board which you can cut. Depending on which tracks you cut you can increase the output to 12db , 18db or 24db. I opted for 12db and it resolved the issue. Plenty loud now.
Yes, I can increase and lower the volume by grounding the + or - pins accordingly. I'm using the pins at the end of the board, which seem to be the same as what you have used. I will try to pull the schematic and ensure its the same.
tried the speaker in the clock radio (32 ohms), which I swapped out as it was low, buts assumed it was impedence mismatch (Adafruit suggests 4 or 8 ohms) bought both 4 and 8 ohms, both same result. Same result using downloaded clip and also onboard clip T00.ogg. This is all outside the project at the moment.
Have built the circuit using the same components as you. Even at full volume, the output from the speaker is really, really low...I mean no way in hell its going to wake someone up. Did you find the same issue? The volume pins on the board work fine, and its at max volume. Might need to revert to the un-amped board and stick a beefier pre-amp in.
Just in-case anyone else has this problem, its easily resolved if you purchase a 12VDC (car voltage) to 110v/60Hz inverter. They are readily available in the UK from ebay. Just ensure its 60Hz, not 50Hz, they sell both. If it doesnt say 60Hz, then dont buy it. You can take it apart and grab the pcb board, then wire in directly 12v DC from any old power 12v power adapter, again readily available on ebay for next to no money. Then just use the output of the inverter to power your clock radio.
Have you tried the link in Step 8? When I try to download I get<?xml version="1.0" encoding="ISO-8859-1"?><Error><Code>NoSuchKey</Code><Message>The specified key does not exist.</Message><Key>FU5/JN2X/I5BSDORB/FU5JN2XI5BSDORB.ogg</Key><RequestId>19606CCD9A55F2C7</RequestId><HostId>WlFlZwJcxxpBNQ144WRhghBRhDnEYc0rmEygNsCUfjQ8iJhMXPxH81fP9TWnc0GoUxndRcOeSRo=</HostId></Error>