2 in for oscilloscope , 4 in for logic analyser , 1 in for trigger , 1 in for ground
I add 2 switches with 2 condensers to have AC and DC .
I make a probe 1/10 and 1 M , with 900 k and 110 k .
I make accessories : a generator with a NE 555 , a preamplifier x1 and x10 with a LM 741 and a generator for 5 v signals with transistors .
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