multivibrator ringing ?
I have built this multivibrator :
I wanted to use it to test amplifiers.But in scope , i see some small ringing at edges of square wave! I used 100nF supply bypass cap directly at ICs pins.PSU is regulated with 7805.there is no supply noise. I thought it was my error , so i built the same cirtuit again , but the problem remains.
How can this be fixed ?
Re: multivibrator ringing ?
And, have you calibrated your scope probes?
Either follow mzzj advice or solder the 100nF directly on the leads of the electrolytic. You have just discovered that 100nF decoupling capacitors are a two edged solution.
Where are you putting the ground line of the 'scope probe? The ground reference is critical; if it's a significant length from pin 1 of the 555, you'll get wiggles in the waveform... You could also put a little bit of resistive load on the output to ground to see if that clears up the ring... (i.e. 100 ohms?)
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