I am getting a couple tiny analog audio power amp kits from ebay. The kits use the TDA2030A chip and require a bipolar supply. Suggested is +- 12V DC of a couple amps. Probably not more than 3A. I want to use the amps in the shop to test and measure speakers. The little guys will be easy to move around.
I have access to a bunch of identical inline switching power supplies that are 12V @ around 4A. I was wondering if I could use two of them with the outputs configured in a bipolar manner with some supply caps to settle everything down. I am concerned about the grounds through the switcher to the bipolar side especially since the switcher line plugs are three prong. If they were old time analog jobbies I would cut them open and use the transformers. But I know nothing about switchers. I drew up a schematic but don't have a way to post it.
BTW, has anyone used a Tripath or equivalent amp to measure speakers? I have one of those little boards as well but the output grounds are not connected to chassis ground because each channel is internally in bridged configuration. I would use that (it too needs a bipolar 12V supply) but I fear the lack of proper ground could damage my sound card or my computer or give me false FR measurements. Any thoughts?
Man am I tired of lugging around a big stereo amp when all I need is 2 or three moderately clean watts of audio power to measure a speaker.
Any ideas are surely welcome.
Thanks
I have access to a bunch of identical inline switching power supplies that are 12V @ around 4A. I was wondering if I could use two of them with the outputs configured in a bipolar manner with some supply caps to settle everything down. I am concerned about the grounds through the switcher to the bipolar side especially since the switcher line plugs are three prong. If they were old time analog jobbies I would cut them open and use the transformers. But I know nothing about switchers. I drew up a schematic but don't have a way to post it.
BTW, has anyone used a Tripath or equivalent amp to measure speakers? I have one of those little boards as well but the output grounds are not connected to chassis ground because each channel is internally in bridged configuration. I would use that (it too needs a bipolar 12V supply) but I fear the lack of proper ground could damage my sound card or my computer or give me false FR measurements. Any thoughts?
Man am I tired of lugging around a big stereo amp when all I need is 2 or three moderately clean watts of audio power to measure a speaker.
Any ideas are surely welcome.
Thanks
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