You didn't answer any of the questions I asked.as i told i'm having only 2n3904 ..tried with that but output was not found ringing.
Thanks. Sorry to waste your valuable time. It sounds like you've already spent almost 1/10 as much time on this as I have.i'll try one more time using simulator
Your schematic and 'scope do not show voltage levels. Is the input a sinewave or a squarewave? Is the output clipping?View attachment 102078View attachment 102079 NI's multisim simulator was used to do simulation.
Have you tried adding a capacitor in parallel with R7 to see how it affects stability?...it oscilates with a small capacitance (e.g. 100pF or 1nF) connected across the output.
C1 is not short circuited. 100mv square pulse was given at the input ,i also tried using cap parallely with R7 ..no effect was shownHi, a few quick comments:
1) Why are some pulses higher than others in the second pic? :???: That's weird.
2) It looks like C1 is short circuited. What was the amplitude (positive and negative) of the input signal you used to get the output you showed?
3) Maybe you missed this in post 10:
Have you tried adding a capacitor in parallel with R7 to see how it affects stability?
It is important for amplifiers to be stable with capacitive loads. The reason is the output is normally connected to something else with a cable, and cables are capacitive.
OK. It's got a line drawn through the middle of it with a connection dot on each side. I didn't know you could draw something like that without it being a short circuit.C1 is not short circuited.
OK, when I get home again. I use SIMetrix though, so you won't be able to run it in Multisim.can you please attach that spice file..so that i can have a good look at it
I did a quick simulation when I was home, and didn't see any obvious instability.i simulated this design using simetrix and found the ringing output..but in real case with the same component..i'm not getting the same
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