555 for the HP-42S 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)

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