I uploaded "LT1006 oscillator.zip" to the Temp folder.? It has three schematics:
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- "Original (corrupt!).asc" is the original schematic that wai wai attached to a message.? It is corrupt, probably because it was attached to a message.
- "Fixed the corrupt values.asc" is the same except that I substituted the "mu" or "micro" character (?) for each instance of the corrupt character, hopefully restoring the original values.
- "Just the fixed oscillator.asc" is the same schematic but with the three other op-amps and all their unrelated circuitry removed, and with one change to the oscillator's biasing, which makes it oscillate with either dual or single supplies.
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Why was the original file corrupt?? (Sorry, long story ahead.)? LTspice uses the Greek letter "mu" (?) to mean micro.? By default, if you have a capacitor, inductor, or resistor with a value in micro-anything - even if you physically type a "u" - LTspice converts it to a mu (?).? (You can disable that if you like, in the Settings / Control Panel.)? That letter is represented by the single byte hex B5 (0xB5).? Some may think of it as if it was part of the ASCII character set, but it is not.? PCs with MS-Windows knew 0xB5 meant "?".
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All is well if those schematics stay within LTspice, and move to and from your computer's drive and most other drives.? But if you take the actual text code (of an LTspice .ASC schematic file) and open it or copy-and-paste it into a text editor, bad things might happen to it.? Some editors preserve it.? Others do not; they notice it is a non-ASCII character and attempt to convert it into something else, which might be either one or two bytes.? We saw that a lot before 2020 when this group was hosted on Yahoo!Groups, because Yahoo's editor would corrupt those bytes if anyone ever edited an LTspice schematic file that had been previously uploaded.
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In this particular case, when wai wai copied-and-pasted the contents of their original schematic file into their message for the group, those characters found themselves converted from ? to Ϥ and they were now corrupt and not recognized by LTspice.? (That is one of the reasons why you should never ever paste a schematic file into your messages in this group!)? I think LTspice interpreted the "1Ϥ" capacitor as a 1 (Farad) capacitor.? And similarly for the others.? Like all good SPICE programs, unrecognized multipliers are ignored.
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In the second file inside the .ZIP, I fixed those corrupt values.? I assumed that all six bad values were supposed to be microfarads.
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Most of the circuitry on that schematic was entirely unrelated to wai wai's question about the oscillator.? So I deleted it.? The third schematic has just the oscillator, with one small change so that it oscillates with either dual or single supplies.
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Andy
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