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Vladimir | Aug. 30, 2018
Q1B in reverse connection
For AD2™ Curve Tracer add-on board
Hello, investigating your device I found that
1. Q1B is definitelly in reverse connection
Are you sure?
2. LMC7101 limits positive output at 3V.
1. Q1B is definitelly in reverse connection
Are you sure?
2. LMC7101 limits positive output at 3V.
Response from knack.supply | Sept. 3, 2018
Hi Vladimir,
Can you please send me a close-up photo of the top side of the board?
1. The Q1B connection issue seems very strange to me as I test all the units before shipping.
2. Yep, the voltage isn't full 5V, but it shouldn't be as low as you say. LMC7101 is a rail-to-rail op amp so you're only supposed to have ≈0.8V drop from Q1 and op amp in total.
Have a nice day!
Can you please send me a close-up photo of the top side of the board?
1. The Q1B connection issue seems very strange to me as I test all the units before shipping.
2. Yep, the voltage isn't full 5V, but it shouldn't be as low as you say. LMC7101 is a rail-to-rail op amp so you're only supposed to have ≈0.8V drop from Q1 and op amp in total.
Have a nice day!
