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  1. 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
  2. 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
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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
  8. 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
  9. 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...
  10. 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...
  11. 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
  12. AnalogKid

    No sound from turntable

    Selector switches, tone control switches, etc. are common points of failure. ak
  13. 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
  14. AnalogKid

    Current Flow

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

    Question about op amp dual supply circuit...

    Is the Radio Frequency book available as a PDF? Thanks. ak
  16. AnalogKid

    Current Flow

    Put another way, the LED *requires* a forward voltage across it of greater than 1.5 v to 3.8 V before it will emit light. The forward voltage of the transistor's base-emitter junction clamps the voltage across the LED to only 0.5 V to 0.8 V for a typical small-signal transistor. Thus, the...
  17. AnalogKid

    Oscilloscope always showing Sine Wave

    If the sine wave always is the same frequency, like 50 or 60 Hz, check the ground clip on the probe. If the ground is floating, the scope will pick up ambient power line energy like a radio. Scope trace photo - ??? ak
  18. AnalogKid

    Resetting Latching Relay with Momentary Button

    What post #15 shows is that the controlling circuit (the relay and switches) and the load that is being controlled (shown as an LED) both run on the same power source. If you had told us this in post #1, this thread would have been finished in post #2. Shawn19 is running a similar thread at...
  19. AnalogKid

    Resetting Latching Relay with Momentary Button

    Depends on the relay. Part number / coil voltage / coil current / coil power - anything - ? Also, what contact arrangement do you need for whatever is being controlled? The basic idea is that the relay needs an extra set of contacts beyond what is needed for the task. For example, if you...
  20. AnalogKid

    Problems with my school project Automatic ON OFF lamp using LDR and MOSFET

    I don't see a resistor in series with the load. Reference designator - ? Unless you mean R15 or R16. Increasing these would make the problem worse. Other than the FET, the most significant impedance in series with the load is C9. Also, a 1N4749 is a 24 V zener. Most power MOSFETs have a...
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