(15C) RC, RL and LC circuits

[Steve Simpkin]

A very clever use of a small 9-line program to solve multiple problems! I had a small number of short analog audio design utility programs like this on my HP-11C around 1987. Shortly afterwards I bought a used HP-28C. It only had 2K of RAM but that was more than enough for dozens of small utility programs and equations that were listed on a menu with 4-5 character names. That was a vast improvement over the HP-11C and the HP-28C Solver was also phenomenal. Around 1991 I migrated to a HP-48SX which I used for analog/digital design work for the next 27 years. I still have many of those utility programs loaded on that HP-48SX and in various emulators.