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Use Schmitt trigger to design a 1 kHz square wave oscillator. Assume the Op Amp supply voltages to be +15V, and the maximum bias current of the Op Amp to be 500nA. Assume that the maximum output of the oscillator to be +-14V.

This is what I have solved so far, The bare circuit i have drawn is as below,but what does the 500nA use for?

schematic

simulate this circuit – Schematic created using CircuitLab

For R1 and R2 is it true for me to set any value but the same magnitude?

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    \$\begingroup\$ Yikes! That's a lot of current thru R1 and R2. Are you sure your opamp can drive a 200 Ohm load? Why not the usual knee-jerk 10 kOhms, or at least 1 kOhms for each? \$\endgroup\$ – Olin Lathrop Jan 6 '18 at 15:50
  • \$\begingroup\$ How about the R3 and C, what value should I set? \$\endgroup\$ – H.Vin Jan 6 '18 at 15:55
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    \$\begingroup\$ We don't just give you answers to homework problems here. \$\endgroup\$ – Olin Lathrop Jan 6 '18 at 17:23

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