Electronics > Beginners
74LS14 testing circuit pls
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Chriss:
When the input is "0" the voltage is 190mV.
When the input is "1" the voltage is 5v.
rstofer:
That seems about right.  VCESat for most transistors is about 0.2V so 190 mV is pretty close.  The transistor is saturated - it is fully ON.
The 5V reading is also about right.  There's very little current flow through the resistor so there is very little voltage drop.

Glad it works!
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