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  1. CDRIVE

    RC filter

    Well perhaps if the high time is 100%. :) Chris
  2. CDRIVE

    RC filter

    I see where I'm going astray here. A PWM wave is not a square wave but I was viewing RC as it would react to one. Which would be a near zero V output with a triangular ripple... Duh! Chris
  3. CDRIVE

    RC filter

    Adam, I'm a bit confused with this circuit. I didn't sim it but it would seem to me that R1 * C1 would more likely transform an (above zero) square or rectangular wave to something that resembles an above zero sinusoidal-(esc) wave. Am I missing something? EDIT: More like a Triangle wave. If...
  4. CDRIVE

    RC filter

    Yeah, I think a common single ended LM324 in voltage follower config should suffice. On the other hand we're assuming we understand what he wants. I've been down that rocky road to many times to admit how many! :D Chris
  5. CDRIVE

    Inject sound to a phone landline

    Uh,.. I think that would be "POTS". ;) Chris
  6. CDRIVE

    RC filter

    If he wants a DC voltage I think it's going to require more than a Diode and Cap because of that very high value collector resistor. Especially if the output signal is going to be split in two. One being the PWM signal and the second.. DC. He's probably going to need a high Z input buffer...
  7. CDRIVE

    biasing this op amp

    You can check that with a DVM. Chris
  8. CDRIVE

    RC filter

    The block diagram on page 1 indicates that the output stage is a common collector amplifier with a very high collector resistor of 80kΩ. With a collector resistor this high you won't need an RC filter. Just "C" alone and it will be very low value. Reading this again has me wondering if we're...
  9. CDRIVE

    biasing this op amp

    Since your original posting of this here... https://www.electronicspoint.com/threads/will-a-basic-buffer-be-sufficient.274460/ I've spent some time studying the Noise Toaster and reading the plethora of data that the author (Ray Wilson) provided on his website. I've also watched two of his...
  10. CDRIVE

    Audio/Video to RF. Help!!

    As I said.. I wish you the best of luck. You'll need it with your Soviet era Germanium's. :) Chris
  11. CDRIVE

    RC filter

    Take a look at the typical app circuit on page 2 and read page 3. http://pdf1.alldatasheet.com/datasheet-pdf/view/26556/VISHAY/TSOP1138.html Chris
  12. CDRIVE

    RC filter

    I think you need to elaborate a bit because I can't decipher what you've posted. :confused: Chris
  13. CDRIVE

    Audio/Video to RF. Help!!

    Miguel, I wish you the best of luck but I must confess that this issue confuses me. Regardless of a U.S embargo and strained relations I don't see how this issue negates the fact that damn near everything is exported from China, and they don't give a hoot about U.S. embargoes or U.S. - Cuban...
  14. CDRIVE

    will a basic buffer be sufficient?

    If that's the way your pots & keys are wired you have no problem at all because that's not a voltage divider in any sense of the term. All your pots are wired in parallel across the 9V source. Each pot is totally independent of the other. Actually each pot constitutes a totally independent...
  15. CDRIVE

    will a basic buffer be sufficient?

    Ouch! That may put you back in the Buffer category because 20 of them will total 2MΩ. The input resistance of the Noise Toaster will certainly load it. Are they wired as potentiometers or rheostats? If you don't know what the difference is you're not alone. On the other hand, all pots can be...
  16. CDRIVE

    will a basic buffer be sufficient?

    If your keyboard has 20 pots with each wiper connected to a keyboard key then yes. What values are the pots? Chris
  17. CDRIVE

    will a basic buffer be sufficient?

    OK, after much consternation I'm reasonably certain what you want to do. I agree that I don't think you need a buffer because you will be connecting the keyboard (resistive divider) to pin2 of R2 which is 75KΩ. In short I think this schematic will work for you. The resistive divider is...
  18. CDRIVE

    will a basic buffer be sufficient?

    If you tell us how many keys you have I think we can draw a schematic for you. Chris
  19. CDRIVE

    will a basic buffer be sufficient?

    I'm forced to concur with you. You are guilty of a practice (repeated here constantly) that drives us nuts! This topic should have been posted like this... Hello, I have one of these white noise synthesizers...
  20. CDRIVE

    will a basic buffer be sufficient?

    As I stated earlier,... that is an AC coupled amplifier. It can't be used for DC applications. The first OpAmp circuit that you posted is the correct configuration. Chris
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