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:wink: use a standard 555 timer ic to generate the required 1000 Hz
timer 555 has a frequency stability of better than .1 %
the timing resistors should be MFR and the timing capacitor should be polyester( dont use ceramic capacitors with class two dielectric)
:roll:
Actually 10% drift is not challenging requirements .
All you have to worry about is quality of capasitor and resistor in RC circuit , power supply stability
opamp general characteristics .
Simply :
Use schmidth trigger Opamp based circuit,
Additionally connect inverting input with output through resistor.Put capasitor between inverting input and ground .These elements will define oscillator frequency .
Schmidth resistors parameters will define hysteresis voltage (affects also frequency as well)
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