Re: Simple transistor NOT gate
- From: Chris <cfoley1064@xxxxxxxxx>
- Date: Sun, 3 Feb 2008 08:18:12 -0800 (PST)
On Feb 3, 1:52 am, Allen Bong <allenbsf6...@xxxxxxxxx> wrote:
Hi,
Is it possible to construct a simple inverter gate using 1 or 2
transistors and resistors?
I tried the circuit below but it doesn't work at all.
VCC
+
|
|
.-.
| |
| |4K7
'-'
|
+------o OUTPUT
|
1K_ |/
INPUT o-|___|----+---|
| |>
.-. |
| | |
4K7| | |
'-' |
| |
| |
=== ===
GND GND
Allen
(created by AACircuit v1.28.6 beta 04/19/05www.tech-chat.de)
You've described a perfect transistor inverter, that should work for
logic level inputs. A couple of things to check:
* Make sure you're using an NPN transistor instead of a PNP, a MOSFET,
or something else.
* Recheck your wiring, looking particularly at the pinout of the
transistor. It's easy to assume EBC when it's ECB, or vice versa.
* Use a voltmeter to actually measure the voltage at the input. If
you're driving the input from an open collector transistor or gate
output, no current will be injected into the base of your transistor
when your logic level is "high".
If you run through these three, the transistor has to be defective.
Replace it.
You've got the right answer right in front of you. Make it work.
Cheers
Chris
.
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