Software Developed by Tonne Software
PIEL v.2 11
This program is designed to facilitate the design of PI and PI-L networks.
OptLowpass v.2 3
OptLowpass™ is a specialized program written to expedite the design of transmitter output lowpass filters, especially for the HF amateur radio bands.
Elsie v.2 43
Elsie is an uncommon commercial-grade lumped-element ('L-C') electrical filter design and network analysis program, directed toward the engineer or technician involved in that line of work.
BITXlowpass v.2.0
Download a program which can be used to quickly design the RF lowpass filter used in the BITX (or other transceivers that have 50-ohm filters).
ActiveLowpass v.2.0
Download the active lowpass filter designer. This program uses the Salen-Key scheme; it offers analysis in addition to design and tuning of the various components. This program is free to use.
Active Bandpass Designer v.2.0
This program uses the multiple-feedback scheme; it offers analysis in addition to design and tuning of the various components. And, most uncommon in such programs, it includes correction for the real-world opamp GBW.