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Thenk you ktComment
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this is a signature analyser (sorry do not know how it is in english right). you see some serial sequence of the codes on the LED matrix.
remember and compare that with working IC same sequence. if matches you do a conclusion the IC is suitable.Comment
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oops. it shows sure a type of IC and all its substitutes, not codes. so this tester is more advanced than i thought.Comment
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did the toy. can check 555s' now.
first practical result. did check 555 from Phil's board. its good. did set in board but again no sound.Comment
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Deleted Post.Comment
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Ordered two of these from BangGood. Not attempted to assemble second unit but the NE555 was dead in the first unit. Replace the 1k/15k Resistors with a Pot and they become variable frequency signal sources.Comment
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they write the board does supply from 9V, but you can supply from 12V. NE555 is max 15-16V according datasheet.Comment
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just received DSO150 kit. nice. very compact case that i do not wait. a manual is detailed with color pics.
LCD is yet soldered to pcb.
https://www.ebay.com/itm/Orignal-Tec...53.m2749.l2649Comment
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I've assembled three of the DSO 150's now. Quite Good for what they are. You can get them pre assemble for $25.00 off BangGood.
Don't assemble the Rotor Encoding Switch PCB up side down. LOL, Did that on the first one and took me a few days to figure out what was wrong.Comment
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