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About opus101

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  1. Alternatively, try Flash Boys : https://www.amazon.com/Flash-Boys-Wall-Street-Revolt/dp/0393351599
  2. 'It is difficult to teach a man something when his salary depends on his not understanding it' - Upton Sinclair
  3. A better DAC - and in particular within the DAC (since its my own design), a better filter and improved output stage. A better amp ties neck and neck with the improved DAC.
  4. Did you try not connecting the scope probe at all and only connect the grounds between the 'scope and DUT? When you connect/disconnect the grounds notice any thickening of the trace?
  5. Errr - Wikipedia not to be trusted on cordless phones then? Inter alia, in their subsection on Frequencies : 43–50 MHz (Base: 43.72–46.97 MHz, Handset: 48.76–49.99 MHz, FM) Allocated in December 1983, and approved for use in mid-1984 for 10 channels. 15 additional channels allocated April 5, 1995.[6]
  6. You were talking about using a 'scope, now you've shifted to using ears. Could we please return to using instrumentation and may I have an answer on the 'scope question? Pretty please.
  7. Where do you find that DAC nowadays for under $50? If you are interested I could build you a custom DAC based on TDA1387s for under $300. Send me a PM if you'd like to chat about that. It would certainly sound better than this DAC as I'll employ all the tricks I learned from modding this DAC - we had a long thread about it on DIYAudio : https://www.diyaudio.com/wiki/TDA1387_X8_NOS_DAC
  8. Well I've heard some 'golden eared' claims before but yours is the first claim I've met to be able to hear RF. Dogs and bats, eat your hearts out.
  9. How high an amplitude in your experience becomes a problem? Unfortunately there's no way to see 'none' with a 'scope so how would you know there was indeed none?
  10. So are you with your 130dB claim. Apparently.
  11. That's one way to look at it. Another is it'll pick up everything within its bandwidth - then how to tell which part is the signal you're looking for? There's a very good reason why much RF work is done with a spectrum analyser not a 'scope.
  12. So which DUT did you use to base your 130dB claim on? This enquiring mind wishes to know.
  13. Ah so the DUT must be a mains supply conditioner, right? But that doesn't fit because @gmgraves clearly called its output a 'signal' and mains supply conditioners only output power, not signal.
  14. Tell us the answer to my question - which DUT gives 123V output?
  15. A bit of back-of-envelope work. A typical mainstream 'scope will have 1mV/div max sensitivity and have an 8bit ADC. This gives 39uV as the lowest level signal it will resolve. 130dB relative to this is 123V - which DUT gives that much output?
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