Powering up for the first time
Always de-power the amp before doing any work! Never connect or disconnect signal connector or speaker cables with power connected as this can damage the amp. The Sleep/mute jumpers are the ONLY exception.
The Tripath TA2020 chip is rated 16V absolute maximum. About 14.0V is a reasonable maximum in real life, to allow for fluctuations. The center pin of the power supply connector J3 is positive.
- Before connecting the power, inspect the board closely for any solder splutter or other contaminations. Clean off everything that looks suspicious. Re-do any solder joint that does not look perfect.
- Remove the jumper from J2, if it is there, for sleep mode.
- Connect the power supply. When in sleep mode, the amp should draw less than one mA.
- If all seems OK, connect the J2 jumper Awake. If all is OK, connect the MUTE jumper as well (Better is to mount a switch on your amp front panel instead of this jumper, but that can be done later).
- Check the fuse. If it has blown, shut of the power, disconnect the board and check all components and solder connections. Check that the Tripath chip heat slug is not hot.
- If all seems OK, shut of the power.
- Connect the speaker wires to J1. Important: the output is bridged, so each speaker should connect to its own respective plus and minus. The minus is NOT ground and negative is NOT common for the two channels and NOT common to the power supply minus/ground.
- Connect a signal source with its ground leads to J5, the 3.5mm jack
- Connect a signal source and set the volume very low
- Turn on the power, awake the amp and check if you get any sound.
- If everything seems OK, you can slowly increase the power. If all is OK, switch off power, replace the power supply fuse for a larger one, rated as your transformer and try again with higher volume. For testing at higher power, the chip should be mounted on a heat sink.
- Enjoy the music!