Timeline for Query regarding 9 V battery connection to 7408 IC
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 30, 2022 at 0:06 | comment | added | Hearth | Yes, the voltage on the IC output goes down. The outputs can be considered as being in series with a resistor. | |
| Sep 29, 2022 at 22:56 | comment | added | jb0 | @Hearth I'm curious - If just an LED (Let's just say 2V forward drop) is attached to the output, which is 5V, how is the other 3V dissipated, even if the IC has limited output current? Does the voltage on the IC output go down to lower the current? | |
| Sep 29, 2022 at 15:03 | comment | added | Hearth | If using a 7408 or 74LS08, you can probably drive the LED directly from the output, as those versions have limited output drive current. A 74HC08, however, has much higher output current and would fry the LED, so you need a resistor there. | |
| Sep 29, 2022 at 12:57 | history | edited | jb0 | CC BY-SA 4.0 | added 3 characters in body |
| Sep 29, 2022 at 12:30 | history | answered | jb0 | CC BY-SA 4.0 |