Building a 555 Astable Oscillator: Achieving 50KHz Output

[Mark Harder]

So I built a 555 astable oscillator. I wanted to get 50 KHz on my output, which I have achieved, but the values of my components do not match the formula I have calculated. I have:
R1 = 98 ohms
R2 = 67 ohms
Cap = 100nF
So I have:
1.44/(98 + 2 67) 100nF
Which should be 62KHz. Also can anyone explain why I am getting 1volt on output with 5 volts in. Thanks in advance for any help.

Have you tested the 555 itself? For instance, if you swap your current chip with another keeping all other components, does it behave exactly the same? The one volt output from 5V in seems strange. BTW, without having the 555 specs in front of me, I wonder if 5V is within the specified Vpower of the chip. Is it at the lower limit of specified voltage? Did you measure the Vpower IN CIRCUIT, or did you assume that was 5V because you used a 5V supply? Are you using the LM555, a CMOS or multiple 555 on a chip version? I'm just casting about here, since I don't know more about your circuit.

 

[Mark Harder]

Sorry about my redundant post. Somehow, I thought there was only 1 reply...