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  1. dorke

    Electronics question!

    Well, The 74LS283 is a 4 bit adder. You need to connect 2 of them in order to add two 8bit numbers. For that you need to feed the carry-out from the 4 LSbits to the carry-in of the 4MSBits . Try it yourself, and if needed,come back with what you have.
  2. dorke

    Clean square waves using a 555 timer?

    Chris, Colin has his own personal Jargon...;)
  3. dorke

    Successive approximation ADC

    "so the first comparison is against 1/2 of the reference voltage. The second comparison halves the first comparison (Effectively 1/4 of the reference voltage). The third comparison halves the second comparison (effectively 1/8 of the reference voltage) and so on.... is that correct? You keep...
  4. dorke

    Headphone amplifier ground issue

    Sounds like it is a Power Amplifier to drive speakers. You can't connect headphones directly to a speaker output, you will damage the headphones ! Please post the datasheet or direct link to it.
  5. dorke

    Successive approximation ADC

    "If the reference voltage is 1V, divided by 2 is 0.5. so would it be 0.5^12? This returns a number I wouldn't associate with digital electronics though. " About terminology: What you call bit0 is called MSB(most significant bit). What you call bit11 is called LSB(least significant bit)...
  6. dorke

    555 Timer with filter

    Start by designing the 555 circuit according to this:
  7. dorke

    Headphone amplifier ground issue

    Welcome to EP, Please post a diagram showing what you did. Why on earth would you connect a 3.5mm plug to the output?
  8. dorke

    Help with Sony slv-n750

    Welcome to EP. A clear photo will help. Don't force anything!
  9. dorke

    diode identification ?

    Looks like it is a SR315 Schottkey rectifier diode 3A/150V from Taiwan-semi. Datasheet attached
  10. dorke

    adding fans and heatsinks to components

    Hold your horses! o_O It is a good thing that you are enthusiastic and have "parts & time". Did you hear the saying "if it ain't broken don't fix it"... Well, why in the first place do you think any of those devices need extra cooling or modding? If you don't have a good answer to that one...
  11. dorke

    Relationship between W/Hz and dBm/Hz?

    Yes, why wouldn't it be simple?
  12. dorke

    Relationship between W/Hz and dBm/Hz?

    Do you know how to convert dBm to Watts ?
  13. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Sorry for not being clear. 1. By "show only the traces with the scope functioning fine", I mean remove all cases where as you said in post # 27: "the PROGRAM is GOING CRAZY", you basically did that already. 2. Not clear why you can't get a single scope channel working and the other off,but...
  14. dorke

    Experts Only: Tesla coil

    Your welcome, This guy is hilarious with a touch of masochisem...:oops:
  15. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Interesting indeed. Could you please show only the traces with the scope functioning fine. Apart from the THD measurement itself,the spectral content of the signal is also very important. Selecting the input channel is done here: Do you have a spiral heater like this one to use as a load?
  16. dorke

    Killing SSR (relays) - Need to understand

    The measurements look well inside the capabilities of the SSR. Are the screws of the breaker tight well? About the failure of the SSR: How long does it take before it fails? Do you have a way to measure it's case temperature? Please post the data sheet of the SSR.
  17. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Looks like you are using both the scope channels. Try to see which one gives the lower THD result and use only that one(turn the other one off). Would be easier to take the netbook to the basement ...;)
  18. dorke

    Cheapest tool to measure Total Harmonic Distortion

    No problem, take your time. Using the mic input isn't "optimal" because this input is actually putting out a small DC voltage to operate the mic (it isn't a dynamic mic like is usual stereo gear, it is an Electret one). If you still wont to use the mic-in, a small modification to the diagram...
  19. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Please post the signals of both generators(oscope and frequency). it would be interesting to compare them.
  20. dorke

    Cheapest tool to measure Total Harmonic Distortion

    The scope is showing a square wave,no wonder it has 45% THD. That can be because of the PC Line-IN volume control is set too high, so the audio card is saturated. Or that the input signal is still too high. Just to be clear, Don't use the mic-input,use the Line-In. You should select only the...
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