Given filter parameters gives the analog form of the transfer function of a filter using the classic approximations: Butterworth, Chebyshev, Inverse Chebyshev and Cauer. Translates in frequency.

Given parameters of a filter, H, wc and Q, calculates an inverting active filter using an ideal OPAMP. Can draw the circuit. Document in English but menus in Spanish.

Given filter parameters, H, wc and Q, calculates some non inverting active filters, including some biquad forms. Can draw the circuit. Documentation in English and menus in Spanish.

Another TVMA program. Emulates these functions from a HP-10B but with some graphical display capability. Given any of PV, i, PMT, FV and n, calculates the remaining variable. Other stuff too. Hope someone finds it interesting.