Hello,
As a part of a bigger circuit I am building an inverter using NPN 2N4401. The circuit is very simple as shown in the attachment. My problem is that when the input to the base is 0V, the LED glows brightly and hence is high. The inverter works correctly. But when the input is 5V, the LED only dims but does not turn off completely.
I tried connecting a 1k resistor to the LED. Didnt work.
I tried connecting a high value (0.6M) pull down resistor across the collector and the emittor. That also didnt work.
Any ideas how to fix this?
Thanks,
Mariam
As a part of a bigger circuit I am building an inverter using NPN 2N4401. The circuit is very simple as shown in the attachment. My problem is that when the input to the base is 0V, the LED glows brightly and hence is high. The inverter works correctly. But when the input is 5V, the LED only dims but does not turn off completely.
I tried connecting a 1k resistor to the LED. Didnt work.
I tried connecting a high value (0.6M) pull down resistor across the collector and the emittor. That also didnt work.
Any ideas how to fix this?
Thanks,
Mariam
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