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  1. Delta Prime

    Power supply help

    Thank you for your honesty you're definitely going to heaven but you might practice a little more here on Earth "soldering". This is constructive criticism; if you were to solder brand new components it would not work as expected. Thank you for taking the time to take other photos it's more...
  2. Delta Prime

    How does this happen?

    Question? Please take note of the (year) this guy joined .. You guys were up and running in 1970? October 29, 1969. As Leonard Kleinrock puts it . "the day the infant internet uttered its first words". Two IMP's(Interface Message Processor) A computer was connected to the IMP, which made...
  3. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    I'm in California it's 5:48 in the morning .I got to be work at 8:00 I normally do some surfing before I go and if I miss my spot in linee to catch a wave it's going to be because of you... :)
  4. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    You're on the right track,you can make your own external voltage divider to make the LM3914 do what you want it to. Because the ends of the voltage divider terminate at pins which we usually tie to ground & the reference voltage, we can in fact connect them another way. If you were to connect an...
  5. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    It means I'm trying to answer your question in detail I haven't abandoned you so just give me a second or two thank you.
  6. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    Stand by Buddy I'm on a stupid phone
  7. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    pin 9 is taken to pin 3 on each IC, and a 470R current-limiting resistor is wired in series with each LED to reduce the power dissipation of the ICs. https://www.nutsvolts.com/magazine/article/led-graph-circuits
  8. Delta Prime

    Portugal: Seeking Unique Experiences & Tech Insights

    Off the beaten path destination Monsanto,Central Portugal, Where have you been living, underneath a rock? (Just kidding) Fred Flintstone houses! Portuguese live like that in the Middle ages.
  9. Delta Prime

    Sallen Key Low Pass Filter, bandpass filter

    You've been working so hard I believe you deserve to have either bar or dot mode with a flick of a switch. https://www.eleccircuit.com/lm3914-vu-meter-circuits/ PIN 9: The ‘MODE’ pin. If this pin is connected to the V+ pin 3, (the datasheetdatasheet has the word ‘directly’ in italics), then...
  10. Delta Prime

    Power supply help

    Make? model number? The information given on the PCB board itself tells me what store it came from. U1 there are numbers and letters etched into it but I can't see from the angle you took the photo so you're going to have to put it under a light and wiggle it around too you can see the etched...
  11. Delta Prime

    Auto shut off circuit

    When we look up into the sky on earth, it may seem counterintuitive, but we are actually looking downwards into the vast expanse of the infinite universe. This intriguing perspective is a result of the gravitational force that binds us to our planet, pulling us towards its center. Despite our...
  12. Delta Prime

    Comedy Thread

    A faster than light neutrino; says ‘I'll have a whisky’, sits down, then walks into a bar.
  13. Delta Prime

    Science fair electromagnet suggestions

    You were doing really good! Until effective internal resistance. I can see why but you can't think of the effective internal resistance like that, it's going to confuse the heck out of you. When you combine two electrochemical cell's you get what is called a battery. Internal resistance of a...
  14. Delta Prime

    Complex unit fails to power up

    Top O’ the moaning to ya. Below is page 40 of the user manual Thank you sir.
  15. Delta Prime

    Comedy Thread

  16. Delta Prime

    Complex unit fails to power up

    Welcome to Maker Pro! :)An MSEE takes your BS to an entirely different level. Confirmation needed. VSSHDSU? Does not exist. More then likely a typo?
  17. Delta Prime

    Small Project to connect two dry contact sensors to one signal. Is it possible?

    Alternating current has no polarity. https://www.electronicshub.org/how-to-use-a-multimeter/ This is your septic tank; bad things happen to human beings Along with their loved ones living in the household around septic tanks. I know you don't wish to spend the money but it will cost a lot more...
  18. Delta Prime

    3.5 digit LCD IC - faulty multimeter (NJU9203)

    +1 As a compliment .. please provide make , model number of DMM. Thank you.
  19. Delta Prime

    Small Project to connect two dry contact sensors to one signal. Is it possible?

    Welcome to Maker Pro. :) If you have a multimeter check to see if you have 12 VAC across the secondary input float switch connection terminals. The float switch itself must present an 1 amp, 12 VAC load for proper operation.
  20. Delta Prime

    I want to make a speed limiter for my motorcycle

    I love off-road dirt bike racing; because I go balls out! I am the governor. All you have to do is toggle a momentary tactile switches to choose from stock, (factory settings) mellow or my favorite berserker(aggressive) settings...
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