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  1. Martaine2005

    Type of single phase AC motor?

    I’d say it’s a magnetic drive pump by your description. I would be surprised if you could control it via a light dimmer. Have you checked it’s current to calculate its wattage?. Dimmers have a minimum load requirement. Martin
  2. Martaine2005

    No sound from Panasonic rx-ed50 boombox

    Did it work properly before you put the lithium battery in?. Two easy things to check initially. Are the speakers ok? And are the connector/s from the PCB to the speakers inserted correctly?. EDIT. Does the sound work with headphones? Martin
  3. Martaine2005

    Tacx T2240 turbo trainer - blown resistor

    May be not missing, rather it wasn’t populated. Do you see evidence of component removal? ie flux or solder residue?. Quite common for many reasons, usually features etc not present on that units model number or revision. Martin
  4. Martaine2005

    How would you go about testing this port without its adapter?

    My crystal ball says that the OP has various DC barrel connectors for the variable power supply, but not for the pictured item. Martin
  5. Martaine2005

    How would you go about testing this port without its adapter?

    Only option for testing without the correct connector is to open the unit and connect direct to the wires. Martin
  6. Martaine2005

    buck boost circuit

    The 7805 is a 5 volt regulator. The 12V is the input voltage to the 7805 voltage regulator. That is where the 5V comes from. Martin
  7. Martaine2005

    Home theatre setup

    Also, is it going in a large room?. 7.1 has 8 channels for 8 speakers. Martin
  8. Martaine2005

    How do you store your test leads?

    Good idea to put your leads on a bracket rather than flat on the wall taking up space. That beige meter by the blue components bin with drawers looks remarkably like my first meter as a kid. Got it from Radio shack (Tandy). Martin
  9. Martaine2005

    I want to design a single led to be powered by 4 garden-sized solar cells

    Has the battery got a cut off circuit?. If not, you risk damaging the battery if you discharge it below approximately 3V. So don’t wait until the LEDs start dimming. Martin
  10. Martaine2005

    dvd's and cd's as capacitor plates

    Too many woo woo’s on YouTube. “Free toast”. “Plug your toaster into a lemon”. Martin
  11. Martaine2005

    TSOP56 Flash which is being bit banged using PIO

    Q1. Surface mount footprint to probe any pin at any time?. A1. What about test points on the PCB?. No connector required. Martin
  12. Martaine2005

    dvd's and cd's as capacitor plates

    A capacitor cannot replace a battery. They are different types of storage. The capacitor discharges rapidly and stores energy physically. The battery discharges relatively slowly and stores energy chemically. Supercapacitors are a bit of both. Wow, 640kg for 1 farad. That’s a huge size for a...
  13. Martaine2005

    Networks Of Multivibrators

    I couldn’t agree more. Sounds fishy to me. Martin
  14. Martaine2005

    Energy Monitor Killed Using Wrong Charger

    Although true, most designers do have a label with either the “ only use with” or the voltage plus maximum Ampere per unit. The OP agreed to being stupid and wrongly used a different adapter. Short story, always check the voltage, polarity and the amperage. Don’t use a 1A iPhone charger to for...
  15. Martaine2005

    Energy Monitor Killed Using Wrong Charger

    I couldn’t agree more. Most of us (me) have iec connectors with 1A, 5A, 13A plug fuses. That will dictate its use. Others have the 5V USB cable that will power anything of 5V. BUT only .5mA or .750mA or 2A. Big difference. Martin
  16. Martaine2005

    Energy Monitor Killed Using Wrong Charger

    Happens all the time. That’s why designers normally put a label (in yellow) saying “only use for this unit”. Also, the designer doesn’t know how stupid the user is!. Just because something fits in a hole, doesn’t mean it belongs there. She or he or it could be married! Martin
  17. Martaine2005

    Failed diodes

    There SHOULD be continuity from various points on the PCB. You just need to know where. Is the mosfet bad? You only said you took it out of circuit. Martin
  18. Martaine2005

    Can You Identify This?

    They have been known to burst into flames. Martin
  19. Martaine2005

    sensormatic amb-2011 power cord pinout?

    Hi, does it have RJ45 on both ends?. These would normally mirror each other. Not always of course. You could open the device and check what voltage goes to the pins with a multimeter. Martin
  20. Martaine2005

    Can You Identify This?

    There’s an electronic rock group called The Prodigy. One of their best songs is called “Fire starter”. Martin
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