DARLINGTON LOGIC PROBE

  
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Two-transistor Darlington connection provides very high input impedance that does not load logic circuit being monitored, while driving LED that glows when logic 1 is present at input.-F. M. Mims, Computer Circuits for Experimenters, Radio Shack, Fort Worth, TX, 1974, p 35-43..
DARLINGTON LOGIC PROBE - schematic




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