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  1. N

    analogue memory system

    Sorry, also don't follow any of it. Is what you are proposing like bucket-brigade devices? 32bits on an analogue signal is quite some impressive SNR. Digital, particularly binary, has benefits in terms of noise imunity. . Maybe you could talks us through it in a less abreviated form? . Some of...
  2. N

    I cant measure voltage on 100 picofarad capacitors on multimeter

    Yes. Exactly. :) Exactly the point. Is that not what he seems to want to measure? The point was to either point out that this capacitor charges to the supply voltage, or to tease from him what he actually wanted. Since he claims no ability to measure the fall with time and has suggested no...
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    I cant measure voltage on 100 picofarad capacitors on multimeter

    Measure it with the source attached? Scope? Simulator?
  4. N

    Fixing old 50ohm antenna

    I guess wire antennas will often look like opens as DC, but generally are something close to matched at their operating frequency for maximum power transfer. Circuits often try to match everything for 50 Ohm (at the operating frequency), but 75 and 300 Ohm is known where it makes sense. . Radio...
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    Fixing old 50ohm antenna

    Sorry, can't picture it. Any chance of an image? The coax outer should have somewhere to go, often for a whip, just a small groundplane, or a few radial wires. A recent post response here contained some references to ARRL antenna pages...
  6. N

    Hi,

    Welcome aboard.
  7. N

    AC->DC converter without a diode.

    Look, I'd have to say "Go for it." You'll learn lots. Have a lot of fun. Probably in the end you'll, like many, have an even greater appreciation for the one you buy to use. On of the guys working here has been perfecting electrostatic speakers over years. His early ones sounded ok, but always...
  8. N

    AC->DC converter without a diode.

    Yep, add 9 volts DC to 9 volts ac and you'll get entirely non-negative voltage, with an average DC level of 9 volts. Might be easier to just use the 9 volts DC. Sort of depends what you're trying to do, I guess. :)
  9. N

    AC->DC converter without a diode.

    Nope. Not in any way that the capacitors have been designed to be used and therefore are likely to keep doing it for long.
  10. N

    AC->DC converter without a diode.

    I'm sorry, but I have no idea what you are trying to do or ask. . Some capacitors such as electrolytics conduct, leak more in one direction, so will sort of rectify, but they are not designed for this and as suggested above will fail, quietly or loudly depending on charge, size, &c. . Remember...
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    AD9850 Generate Random Fixed Frequencies Controlled By MEGA328P-AU

    Are you saying that the you load the AD9850 registers but the ourput frequency is not the one you hoped for? If the values you are loading are correct for the frequencies you want, I'd have to assume that your communication is not working. How are you determining the frequency of the output?
  12. N

    AC->DC converter without a diode.

    Not sure where the resistor you describe goes. Got a schematic. . Did you have a question?
  13. N

    Sleeve Antenna

    Been a while since I've been in that area. "Sleeve antenna" is a general term covering quite a number of implementations. Generally, though you are making a dipole by using something, such as coax outer as the side opposite the coax centre. A standard whip I guess is a monopole. To get radiation...
  14. N

    e meter/wheatstone bridge

    Can't say I think such a circuit is much use for anything, but , ... Battery marked "9 volt" near the left, above centre. Near a regulator which provides a regulated 5 volt to the ciruit from the 9 volt battery. . What method are you going to use to build it? I mean to support the components and...
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    How to test buzzer

    Saw them. :) Generally people buy such things, so they often have a link to the site that they got them from & with that a part number, or datasheet. I understand that in your case they arrived by a method that provided no such part number. Got it. People are working quite hard to try to help...
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    How to test buzzer

    No. That won't help. It may be that your buzzer is a sort of speaker used for buzzers and that you need to give it a sound signal, an oscillation, instead of just on and off. If your "buzzer" needs an oscillating signal, you can make this with the micro, the PIC, without the crystal. Sorry, not...
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    How to test buzzer

    Can you share a part number for the buzzer? Or a data sheet?
  18. N

    Sound waves travel

    Subwoofer? - low frequencies tend to propagate better through solid objects Wired speakers , BLE/Wifi speakers? - Send the audio through as something else, then make the sound on the other side? . Tell us what you;re wanting to achieve?
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    Talking Sculpture

    Check for posts on similar topics? https://www.electronicspoint.com/forums/threads/id-like-to-know-how-put-a-digital-sound-bite-on-a-component.293140/#post-1799830
  20. N

    Can Batteries Exhibit Resonance at Particular Frequencies?

    If the claims are for reduction in cystals, dendrites and increased battery life, this could be a substantial and long experiment.
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