SignalGen is a free app that outputs relatively low frequency signals with the use of a PC sound card. It is an entirely suitable replacement for a hardware signal generator (electronic instrument that generates repeating electronic signals) for signals of a frequency higher than about 50 KHz.
SignalGen creates any frequency between a fraction of a Hz and an upper limit determined by your sound card's capabilities, typically about 50 KHz. It works like a hardware audio generator, creating sine, triangle, square and sawtooth waves, that can be monitored in real time.
SignalGen is CareWare.
The auhor only asks you to stop whining about how hard your life is, at least for a while.
Linux only.
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