What works on the neon bulb procedure:

A combination of
C = 162 nF
R = 4.7 Mohm
V_0 = 98 V
worked to give a T of about 1/3 second.

What works on the charge-discharge procedure:

A combination of
C = 100 microF (50 + 50 in parallel)
R = brown black yellow
V_0 = 15 V DC

What works on the differentiator procedure:

A combination of
C = 155.4 nF
R = 4.917 kohm .

What works on the integrator procedure:

A combination of
C = 966.1 nF
R = 1.002 kohm .