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Class D Switching Power Amplifiers and Power D/A conversion

Ebay cheap TDA7498 boards
Ebay cheap TDA7498 boards
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Old 17th October 2018, 09:38 PM   #631
FauxFrench is online now FauxFrench  France
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Join Date: Dec 2017
Sorry, I mixed up the 7498 board you have with the 7498E board using a 5-pin SMPS IC.

For your board, it is an SMD LM317 linear regulator. With the three leads pointing towards you, the most left pin is the reference pin. If you turn the trimmer many turns counter-clockwise and then many turns clockwise, You do not at any moment see a change in voltage on that reference pin measured with ground ("-") as reference?
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Old 17th October 2018, 09:39 PM   #632
jimk04 is offline jimk04  United Kingdom
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I don't think I spun the pot enough. I shall have another go
Too busy playing with 3e 3255!
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Old 17th October 2018, 09:42 PM   #633
FauxFrench is online now FauxFrench  France
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3255, good toy!
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