@Frank_fjs Caps?
Operating Rules1.
An external resistor (RX) and an external capacitor (CX)are required for proper operation. The value of CX mayvary from 0 to approximately 1000 mF. For small timeconstants high-grade mica, glass, polypropylene, polycarbonate, or polystyrene material capacitor may be used.For large time constants use tantalum or special aluminum capacitors. If timing capacitor has leakages approaching 100 nA or if stray capacitance from either terminal to ground is greater than 50 pF the timing equationsmay not represent the pulse width the device generates.
National Semiconductor 74LS221 Datasheet
Operating Rules1.
An external resistor (RX) and an external capacitor (CX)are required for proper operation. The value of CX mayvary from 0 to approximately 1000 mF. For small timeconstants high-grade mica, glass, polypropylene, polycarbonate, or polystyrene material capacitor may be used.For large time constants use tantalum or special aluminum capacitors. If timing capacitor has leakages approaching 100 nA or if stray capacitance from either terminal to ground is greater than 50 pF the timing equationsmay not represent the pulse width the device generates.
National Semiconductor 74LS221 Datasheet