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Old 20th May 2006, 05:53 PM   #1
Bazukaz is offline Bazukaz  Lithuania
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Default multivibrator ringing ?

Hi,
I have built this multivibrator :
http://www.interq.or.jp/japan/se-inoue/e_ckt5_1.htm

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 ?

Best regards,
Lukas.
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Old 21st May 2006, 03:40 AM   #2
mzzj is offline mzzj  Finland
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Default Re: multivibrator ringing ?

Quote:
Originally posted by Bazukaz
Hi,
I have built this multivibrator :
http://www.interq.or.jp/japan/se-inoue/e_ckt5_1.htm

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 ?

Best regards,
Lukas.
Try better bypassing, for example remove that 100nF and use only 220uF electrolytic cap. and/or use cmos-version of 555, LMC555 for example.

And, have you calibrated your scope probes?
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Old 21st May 2006, 04:28 AM   #3
Eva is offline Eva  Spain
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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.
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Old 22nd May 2006, 03:26 AM   #4
clem_o is offline clem_o  Philippines
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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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