Low frequency TTL oscillator

This oscillator uses standard inverters, one resistor and one capacitor, and has no minimum operating frequency. R and C must be chosen such that currents into the gates are below recommended operating limits and that leakage current into the gates and into C are small in comparison with the current in R also the output should be buffered (13) to prevent variations in load affecting frequency.
Low frequency TTL oscillator  - schematic

This circuit may also be used to square up slowly changing logic levels by use.of multi input gates (NANDS, NORS Etc).

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