Search results

Search Forums New Posts
  1. Audioguru

    I cant measure voltage on 100 picofarad capacitors on multimeter

    I cannot think of any reason to measure the voltage on such a low value capacitor. Instead you might be able to measure the voltage of the thing that charges it.
  2. Audioguru

    I cant measure voltage on 100 picofarad capacitors on multimeter

    Calculate the capacitor discharge time. Your voltmeter might be 20M ohms x 100pF = 2000us which is 2ms. Your voltmeter cannot show anything for only 2ms but if it did you will not see it.
  3. Audioguru

    AC->DC converter without a diode.

    Without learning about how radios work then your radio will not work. Without learning about how amplifiers work then your amplifier will not work. Without learning about how speakers work then you will ne lucky of yours sounds awful like a buzzer. The industry standard for car radios is...
  4. Audioguru

    AC->DC converter without a diode.

    What a day! A few minutes ago I watched the Formula One car race and tried to translate the severe accents of the announcers from England and the severe accents of the drivers from all over the world. Now I watched this You Tube video from India with its severe accent. I suspect that the...
  5. Audioguru

    AC->DC converter without a diode.

    Of you add DC then the AC is not needed.
  6. Audioguru

    AC->DC converter without a diode.

    With your very low resistor values and 60Hz then the capacitor must be a huge electrolytic one. When it gets the wrong polarity 60 times each second from the AC then it will explode. A series diode blocks the wrong polarity, it does not short it like your capacitor does.
  7. Audioguru

    Need Help with simple 9V circuit design.

    No, the speed of the motor should be controlled with a Pulse Width Modulation circuit (PWM). Your pot will get hot and probably soon burn out and if the speed is set low then the motor probably will not start running. If the load on the motor increases then it will slow down and maybe stop.
  8. Audioguru

    Can anyone point me to a wideband Class A?

    A class-A amplifier makes A LOT of heat all the time, even when it is not playing sounds. 500kHz is a radio wave that is far higher than sound or ultrasonic waves. 20W is not loud unless it plays continuously at full blast close to you.
  9. Audioguru

    Talking Sculpture

    There is a gadget that sends modulated ultrasonic waves to an object (your sculpture) and it creates an interference pattern on the object causing sounds or speech to seem to come from the object. One device is called Hypersound (look in Google). It sends a very narrow beam of ultrasonics that...
  10. Audioguru

    LED Power supply?

    A load does not take more current than it needs. The low current clock in your car is not fried by being powered from the car's extremely high current battery.
  11. Audioguru

    Intel Quartus - No output for Q2 and Q3

    We cannot access your Google Drive account. Please copy the image and attach it HERE to your reply. Oh, you are new here, then maybe you cannot attach anything until you make maybe 10 posts so the moderators can see that you are not a spammer.
  12. Audioguru

    Need Help with simple 9V circuit design.

    The datasheet for the LP2950 voltage regulator shows the pinout and shows important input and output capacitors that you are missing.
  13. Audioguru

    Back...sort of...

    If your electrical outlets are fairly modern with 2 terminals for power plus a third terminal for ground then the screw that holds the cover plate on a metal electrical box is grounded.
  14. Audioguru

    Back...sort of...

    I guess the old radio uses vacuum tubes that wear out and are obsolete. Shortwave has a restricted high audio frequency range (sounds muffled) like an AM radio and picks up static and other Amplitude noises. Some ham radio operators might be operating in your neighbourhood and cause the antenna...
  15. Audioguru

    Farewell

    SparkyCal, I am also a Canuck. I was glad to help you. You will be back to make more guitar distortion.
  16. Audioguru

    Why do I not get e-mails about replies to threads I am involved in here?

    Thank-you. All email notifications from this site were in my SPAM folder but none from other forums. I clicked on "not junk" for each of many of the emails in the SPAM folder and hopefully future emails from here will not become SPAM.
  17. Audioguru

    Why do I not get e-mails about replies to threads I am involved in here?

    Yes, email notifications from this site are recently going into my SPAM folder. It does not happen on any other forum. Can I fix it (it is Gmail)?
  18. Audioguru

    Question about the forum

    Your New Thread asked how to make a 40 thousand Volts, 20 thousand Watts power supply without knowing how dangerous it would be. Dangerous projects are not allowed to be discussed here. It could kill you and your entire neighborhood or family. A school kid might copy your project and take it to...
  19. Audioguru

    New Stompbox Project

    Some LF353 opamps will not work when powered from a slightly used (heading towards 6V) 9V battery. The OPA134 Jfet-inputs opamp that I recommended works fine and also has much lower noise (hiss). Your new "power source" schematic has different parts designations (is its R3 the old R41??) so it...
  20. Audioguru

    Why do I not get e-mails about replies to threads I am involved in here?

    I notified eerob but got no reply. Bertrus, my Spambox has email notifications of your replies here but not from eerob and not from anybody else. I get no email notifications of any threads I am active on here.
Top