
"The TLN-867 Tuner & Headphone Monitor combines an A440 reference tone generator, a headphone amplifier, and a beat frequency indicator all in a 1U module. The A440 generator is none other than David Brown's excellent DJB-A440 Reference Oscillator, a super stable digital A440 tone generator."
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Tellun.
Very cool and useful module. I built one into a FracRack module with a "tiny" oscilloscope. See my page:
ReplyDeletehttp://www.xmission.com/~dingebre/page5.html