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Check that none of the unconnected pins require pull-up or pull-down resistors t...
alexrc

alexrc

@copilot Check that none of the unconnected pins require pull-up or pull-down resistors to ensure proper function.
1y

copilot

Let’s go through each of the unconnected pins of your components and check if they require pull-up or pull-down resistors to function correctly.
  1. LM35CZ/NOPB (U1):
    • Pin 1 (+VS): Connected to Vcc (implicit).
    • Pin 2 (GND): Connected to GND.
    • Pin 3 (Vout): Connected to U2's positive input.
  2. LM741 (U2):
    • Pins 1 and 5 (NULL): Typically not used. No pull-up/down resistors needed.
    • Pin 2 (-): Connected to R1's wiper (adjustable voltage).
    • Pin 3 (+): Connected to U1's Vout.
    • Pin 4 (V-): Should be connected to a negative supply voltage if not using a single supply configuration.
    • Pin 6 (OUTPUT): Connected to LED1 and LED2 anodes.
    • Pin 7 (V+): Should be connected to a positive supply voltage.
    • Pin 8 (NC): Not connected. No pull-up/down resistors needed.
  3. 3362H-1-104LF (R1):
    • Pin 1: Connected to GND.
    • Pin 2: Usually the adjustable wiper. Should be connected to the negative input of the op-amp $U2:2$.
    • Pin 3: Likely the fixed end of the trimpot. Should be connected to the negative input of the op-amp if not already.
  4. CTL1206FYW1T (LED1, LED2):
    • Pin 1 (K): Cathode, should be connected to GND or a current-limiting resistor.
    • Pin 2 (A): Anode connected to the op-amp output.
Suggestions for Connections:
  1. LM741:
    • Connect $U2:4$ (V-) to GND (if using a single supply configuration) or to a negative voltage supply.
    • Connect $U2:7$ (V+) to your positive supply voltage (e.g., 5V).
  2. Trimpot (R1):
    • Ensure the wiper $R1:2$ connects to $U2:2$ (-).
  3. LEDs:
    • Ensure the cathodes $LED1:K$ and $LED2:K$ are connected to GND or through a current-limiting resistor.
No pull-up/pull-down resistors are explicitly required for the unconnected pins if you follow the suggested connections above.
1y
1
LED1
R1
Resistance
100kΩ
LED2
U2
U1

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