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555 for the HP-42S
By Ton van de Burgt
Several solver programs for handling a 555 timer.
Monostable
operation
T= 1.1 x R x C [seconds]
Usage:
Start the solver and select “555M”
Fill in the known values and solve for the unknown value.
Astable operation
Oscillation frequency:
f = 1/T = 1 / 0.693 x C x (R1 + 2 x R2)
Usage:
Start the solver and select “555A”
Fill in the known values and solve for the unknown value.
Binary files for emulators:
Raw binary: 555a.raw Binary for
HP-42X: 555a.42x (HP-48) 555a49.42x (HP-49)
Raw binary: 555m.raw Binary for
HP-42X: 555m.42x (HP-48) 555m49.42x (HP-49)
Generated by 42s2html - 10
November 2004, 22:04