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| Audio generator for sine and square waves |
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| David Hess:
I have a couple of old style analog function generators, and a Tektronix FG502 function generator which operates up to 11 MHz. The lowest distortion analog function generators that I am aware of are the Tektronix FG501A and FG507 which were intended for audio applications, but of course they are not that good at 0.25%. A modern cheap DDS *should* be better. Function generators are really the wrong instrument for audio distortion testing. Old dedicated analog sine sources achieved 0.0008%, which may not be quite as good as the best audio instruments like the QuantAsylum, however it is relatively straightforward to build an analog source which is much better, and it is the only way to verify the performance of 20+ bit audio ADCs. These are better than even anything from Standford Research Systems or Audio Precision. The QuantAsylum QA403 probably has the best performance for cost if you are interested in noise and distortion measurements, but it would not be my first choice for design because it does not support network analysis even though it should. Something from Cleverscope would be more suitable for design work, but maybe someone else here knows of a less expensive option for network analysis. |
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