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Old 31st December 2004, 03:02 AM   #1
esc is offline esc
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Join Date: Jan 2002
Default newbie Q on troubleshooting

happy 2005 ...
need help in troubleshooting this entry amp as i'm just starting out

referring to this 22watt amp using TDA1554 http://www.aaroncake.net/circuits/amp20w.htm

have wired everything point-to-ponit, added a 50k pot and a headphone jack as input
power source was a 12v car battery

- is wiring all ground (signal or pwr) to a single point ok?

- followed the ESP troubleshooting page, and used 2x 100K safety resistors at both 12V+ and - ends for testing

- nothing was warm, not even the heatsink

- output voltage at the speaker ends were about 10mV
with or without an 8ohms load (this is ok right?)

- after removing the two safety resistors, and without load and input, the heatsink became warm but everything else was not

- power source voltage was about 15v
but output voltage at the speaker ends were also about 15v???

- 8ohms load heated very fast if placed in

- any give where i should start looking?
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Old 31st December 2004, 09:47 PM   #2
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check all connection bewteen power supply and chip. Make sure you get the right voltage at pins 5,13 and 14, check for cold solder points
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