I've been trying to get an astable oscillator timer circuit to work but have had no luck yet. I set up the following circuit on my breadboard using an NTE955M IC timer.
Here is the circuit I'm attempting:
http://home.cogeco.ca/~rpaisley4/LM555Astable.GIF
With:
R1 = 1000 ohms
R2 = 5100 ohms
C = 47μF electrolytic rated at 35V
...presumably resulting in approximately 2.7 cycles per second.
Source = 3V. Also tried 9V.
Output as LED (2.1Vf, 20mA) with resistor.
The LED should blink 2.7 times per second when the circuit is active.
I have not been successful. What am I doing wrong?
Here is the circuit I'm attempting:
http://home.cogeco.ca/~rpaisley4/LM555Astable.GIF
With:
R1 = 1000 ohms
R2 = 5100 ohms
C = 47μF electrolytic rated at 35V
...presumably resulting in approximately 2.7 cycles per second.
Source = 3V. Also tried 9V.
Output as LED (2.1Vf, 20mA) with resistor.
The LED should blink 2.7 times per second when the circuit is active.
I have not been successful. What am I doing wrong?
Last edited: