I am struggling with forward biasing a diode in the circuit in the attached.
All the wires are attached properly, as there is continuity. The diode drops only 0.400V with a 9 V battery connected, the resistor being 330 ohms. I cannot understand why the diode would not drop the amount required to forward bias itself and as a result allow current through the LED. At the moment most of the voltage is being dropped across the resistor and LED. Am I making some fundamental mistake I cannot see? Of course I tried connecting both the diode and LED in reversed polarity with no change.
Apologies for not posting more pictures. I have RSI and need to limit how much I use the computer.