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  1. AnalogKid

    help with a 12v control circuit

    This could be a simple as adding one capacitor, but not without more information. For your relay - manufacturer / part number / coil current / coil wattage / datasheet / link to product page - anything - ? ak
  2. AnalogKid

    Trying to identify what these are

    Almost all small, low-cost electret microphone cartridges have a FET buffer built in. Two wires means you need an external bias current resistor between the audio out connection point and a low DC voltage. What is the operating voltage of the system you want to build? ak
  3. AnalogKid

    LED Supply Mounting

    I don't see any air vents in the enclosure, an interesting design choice. Sometimes, empirical data trumps a datasheet. Try this --- Get one, put your max load on it, put it in a shoe box with the lid on, or something smaller that approximates the air volume it will be trapped in, and come...
  4. AnalogKid

    Speakers and Bass Frequencies

    Wow. Speaking of color-blind . . . ak
  5. AnalogKid

    How to test 24v on this plug

    The way the connector is laid out suggests that there might be two independent 24 V outputs. ak
  6. AnalogKid

    Speakers and Bass Frequencies

    By that definition, the 85% of the world's population that is not at least partially color-blind is in fact color-blind. You are confusing a normally-functioning sensor that has both normal and abnormal ranges of response with the response of a theoretically perfect sensor that does not exist...
  7. AnalogKid

    Speakers and Bass Frequencies

    In a population raised in current music technology, above age 8 only around 1% can "hear" over that entire range. ak
  8. AnalogKid

    Understanding audio splitter in reverse

    Or two resistors. It is not clear from the posts if the cable splits the stereo plug into two mono jacks (one left, one right), or if it is a true splitter with two stereo jacks. If the latter, then each jack needs two resistors, one for each channel. ak
  9. AnalogKid

    Understanding audio splitter in reverse

    Depending on the output stages of the two devices being combined in the cable, things might not work well at all. The output impedance of a music player or whatever can be very low, much lower than the 60 ohms of so impedance of a pair of earbuds. Thus, each output can present what looks like...
  10. AnalogKid

    Adding headphone jack to piezo buzzer

    As above, it depends. There are two basic types of piezo beepers. One takes DC power and has an internal oscillator that drives the piezo element. Adding an earphone jack to this type will not work, because the audio signal is internal to the beeper device. The other is a bare piezo element...
  11. AnalogKid

    Capacitor type in low pass filter

    It is a response to what I saw on this and other forums back when I joined. It seemed like many of the answers to just about every question were either a 555 or a microcontroller. I started pushing back. Don't get too comfortable with the devil you know. The devil you don't know can be a fun...
  12. AnalogKid

    Capacitor type in low pass filter

    No, it is derived from the word enginour (“one who designs, constructs, or operates military works for attack or defense, etc.; machine designer”. Later, it became associated with engines; specifically, coal-fired steam engines in factories and, yup, trains. As a parallel example, a...
  13. AnalogKid

    Capacitor type in low pass filter

    JRA - My post #8 was a response to the TS, not to you. In an open thread format like this site, keeping track of who is responding to whom can get confusing. ak
  14. AnalogKid

    Capacitor type in low pass filter

    Page 26 is an article on how to design a very low distortion sine wave oscillator. If that is not on point, what did I miss? ak
  15. AnalogKid

    Lighting for street sign

    That is not how it works. The circuit is, effectively, two monostables in series in a circle. The end of each one's pulse triggers the other one. The output pulses cannot overlap in any circumstance. If you want to build one, I would use a CD4093 for the monostables (two gates each) and two...
  16. AnalogKid

    Driving a ring of LEDs in strobe mode

    What is the value of V19? What are the amplitude, frequency, and positive pulse width of VG1? What current; there are two indicated on the schematic. What are the details of the ramp? Your questions is not clear about what you are trying to achieve. Are you trying to drive the LEDs with...
  17. AnalogKid

    Capacitor type in low pass filter

    Page 26: https://www.analog.com/media/en/technical-documentation/lt-journal-article/LTMag_V04N1_Feb94.pdf https://www.analog.com/media/en/technical-documentation/technical-articles/ubm_edn_20110811%2018Bit%20ADCs%20Ad%20Free.pdf ak
  18. AnalogKid

    No sound from turntable

    Selector switches, tone control switches, etc. are common points of failure. ak
  19. AnalogKid

    Current Flow

    Rule #1 in forums - First, answer the question that was asked. Rule #2 - Bang on and on about reference designators and which way ground symbols point. ak
  20. AnalogKid

    Current Flow

    There aren't any, making a detailed discussion of the circuit fraught with ambiguity and peril. ak
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