wai wai,
?
The schematic you attached to your message today has several mistakes.? I am just letting you know.? It was a very sloppy schematic and you should not have used it as an example.
?
Apparently the question was about the LT1006.? But your schematic also has three other op-amps, which are apparently unrelated to the question, and you forgot to connect any power to those op-amps.? Without power, they can not operate.? Leaving inoperable circuits on the same schematic can cause problems with the simulation.? It might even have caused the oscillator to not oscillate (although that was not the reason in this case).
?
You used multiple net names on the same nets.? That is unwise and should be avoided.? Nets (wires) can have only one net name.
?
The comment on your schematic asked:
LT1006 is single supply OPA
but single 5V has no square wave oputput
dual power supply vcc & vee must be, why ?
The answer to that question is because your circuit is wrong.? It does not oscillate because the voltage on the "voltage" "vcharge" net (across the capacitor) never drops below the voltage at the R7/R6 junction, when the op-amp drives Low.? That voltage must become lower in order for the op-amp's output to go High, which it can never do.? The circuit has a stable operating point when the amp's output is Low.
?
You must re-arrange the bias conditions of your circuit to make it oscillate with a single supply.? The LT1006 op-amp is operating correctly.
?
Andy
?
?
