Re: Using Op Amp as comparator
*SUCCESS.* Big thanks again.? Changing the MAX9095 power supply to 6 VDC did the trick.? Note the extra parts for hysteresis, per the datasheet. Thanks for the suggestions.? I've heard the
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Macrohenry
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#160175
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Re: Crystal oscillator oscillation startup
You (Cheng Fei Phung) seem to be grasping at straws with pretty minimal understanding. In your situation, I would disconnect the "crystal" and feed a small transient 1.1MHz signal (say a hundred mV
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Jim Wagner
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#160174
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Re: Crystal oscillator oscillation startup
I see you added a simple RLC series resonant circuit to represent a crystal.? Do you know that it is an appropriate model?? Does this oscillator circuit depend on series resonance, or parallel?? (I
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Andy I
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#160173
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Re: Crystal oscillator oscillation startup
@Andy /g/LTspice/photo/302220/3911798?p=Created%2C%2C%2C20%2C2%2C0%2C0 still do not show any oscillatory phenomenon after adding RLC between Q1 and Q2. See ck_osc.asc (
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Cheng Fei Phung
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#160172
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Re: Using Op Amp as comparator
I met one of those, so I used the 'bullet' character ? as the decimal point in my report. -- This email has been checked for viruses by AVG antivirus software. www.avg.com
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John Woodgate
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#160171
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Re: Using Op Amp as comparator
I recommend not using numbers like ".002".? Leading decimal points are easily missed.? To my old eyes, it looked like you wrote "002" - until I squinted. Instead, use one of these: * 0.002 * 2m *
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Andy I
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#160170
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Re: Using Op Amp as comparator
(1)? You do not need to add a library file.? It is included when you use its symbol. (2)? I just tried it, and it works great for me! So, what did you do wrong, that makes your simulation fail??
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Andy I
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#160169
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Re: Using Op Amp as comparator
The 9095 is a quad. Are you using all four units or what? Why not upload your .ASC, so we can see what you are doing? -- This email has been checked for viruses by AVG antivirus software. www.avg.com
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John Woodgate
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#160168
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Re: Using Op Amp as comparator
FWIW, the LT1017 comparator also works with simple substitution.? I have what I need for now, although I'm curious why the MAX9095 doesn't work.
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Macrohenry
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#160167
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Re: Using Op Amp as comparator
Forgot to mention, in the transient analysis, the stop time is .002, so the graph displays two cycles.
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Macrohenry
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#160166
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Re: Using Op Amp as comparator
*SUCCESS!* Thanks, guys, I got it working with Universal Op Amp 2.?? It's working as it should. I'm using simple transient analysis.?? The whole circuit consist of? one op amp and three voltage
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Macrohenry
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#160165
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Re: Vin vs. Load - YX logarithmic plot
I find that in many cases, the plotted variable does reach very small values, which are of no significance or interest, but Autorange accommodates them, as it should, having no 'knowledge' of which
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John Woodgate
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#160164
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Re: Vin vs. Load - YX logarithmic plot
¡°If I immediately right-click in the plot pane and select "Autorange Y-axis", it usually fixes that problem¡± Begging the question of why that *isn¡¯t* the Automatic default! Sent: Friday, May 02,
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Bell, Dave
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#160163
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Re: Possible g;itch in stepping parameters
For the life of me, I can not understand the purpose of "{{", no matter how hard I try. I get it if the formula was something like this: "... { { thing1 } + thing2 } ...". I do not understand when the
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Andy I
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#160162
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Re: .savestate directive no longer works
This is a good catch. From the posting in EZ, I was able to reproduce the problem. It appears that if you have "Generate Expanded Listing" ON and you use .savestate, you will see this error message in
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mstokowski
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#160161
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Re: Possible g;itch in stepping parameters
I think it is clear - to me at least - that it is the intention, and the only thing that makes sense.? If you started with with or without curly braces anywhere in there, it seems clear that you want
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Andy I
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#160160
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Re: Using Op Amp as comparator
Which op-amp did you use? LTspice's "opamp" is an unbounded ideal op-amp.? In the absence of feedback, its outputs could become indefinitely large, either positive or negative.? Perhaps they reach
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Andy I
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#160159
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Re: Using Op Amp as comparator
In message <[email protected]>, Macrohenry via groups.io <macrohenry@...> writes Universal Opamp and Opamp 1 don't respect the power rails so the O/P will scale
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Brian Howie GM4DIJ
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#160158
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Re: Using Op Amp as comparator
Your description sounds confusing. You say 6V 1000Hz Sine wave, suggesting to me that you are running a ".AC"? analysis which is a "small signal" AC analysis, so you wont get an "output" which is a
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Frank Fattori
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#160157
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Re: Crystal oscillator oscillation startup
I do not see a crystal on the schematic photo you uploaded ( /g/LTspice/photo/302220/3911530). I wonder if that schematic is supposed to be just the on-chip part of a circuit, where
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Andy I
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#160156
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