| Electronics > Beginners |
| Triangular wave on ring oscilator |
| << < (3/3) |
| Wimberleytech:
--- Quote from: Belrmar on May 29, 2018, 02:53:49 pm ---ook lets start, the oscilloscope is a promax od-416, i am using a 10x probe(oscilloscope does not have compensation for that but i can live with it) , the part number is cd40106BE, supply voltage is 12v from a linear regulator powered by a switching one.all the caps are 22nf. oscilloscope set 1uS and 2v per division (having on account the 10x) images here: https://imgur.com/a/wEfyz6C --- End quote --- Great! Your triangle waveform ramp rate is 6 volts per microsecond (deltaV/deltaT = 6e6) I = C x deltaV/deltaT I = 22e-9 x 6e6 = 132 mA The 40106 cannot deliver that much current. Therefore, I think your capacitor is not 22nF. Please show us a picture of the capacitor markings (all three side by side). Why are traces different??? Assuming the caps are all the same, consider this possibility. If you removed the caps from a tape carrier (often they come this way), I have found that there is glue reside on the terminals. This residue can insulate the wire and thus not make a connection. Make sure the terminals of the caps are clean and making good contact. |
| Belrmar:
--- Quote from: Wimberleytech on May 29, 2018, 03:19:45 pm --- Therefore, I think your capacitor is not 22nF. --- End quote --- agreed i made a bit of a fool of myself, the markings where 221 not 223, i should use my glasses more often |
| Wimberleytech:
--- Quote from: Belrmar on May 29, 2018, 03:29:39 pm --- --- Quote from: Wimberleytech on May 29, 2018, 03:19:45 pm --- Therefore, I think your capacitor is not 22nF. --- End quote --- agreed i made a bit of a fool of myself, the markings where 221 not 223, i should use my glasses more often --- End quote --- Ahaaa!! No problem. I wear 3x readers and sometimes even that is not enough!! Still does not answer why one of the outputs is a square wave. |
| Belrmar:
Just used another of the ic's form my batch and this one is giving me 3 square waves.... i am a bit confused, might be some esd dmg that led to a damaged output stage? a bad puppy on the batch... no idea tbh |
| Brumby:
With 3 caps on 3 stages, I would expect 3 triangular waveforms. 3 square waves doesn't make sense. I would be really checking the contacts of those caps. Is it still running at the same (or similar) frequency with 3 square waves? |
| Navigation |
| Message Index |
| Previous page |