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  1. Externet

    Combining two +12v car outputs

    From what I have seen in incandescent; limits are 55Watts, ~<5Amperes. If LED consumes a fifth... Brings another question, what limitations are headlights for LED emitters ... on lumens or watts ?:oops:
  2. Externet

    Combining two +12v car outputs

    A relay can energize the +12V load you want when the other +12V line is active, with less diode voltage drop.
  3. Externet

    Best Practices for Component Sourcing in DIY Electronics Projects

    First choice, I source what I can out of salvaged boards from discarded or failed equipment, kept as boards to pick whatever is needed, not dismantled as components and sorted-binned. Maaany times I use a hack saw to cut off portions of a PCB to extract only a functional section that connects...
  4. Externet

    A Phony Question

    This thread triggered nostalgic times and revisited my telephony parts bins. Among the gadgets, a transistor radio I made to work from the telco line power for no-AC mains emergency situations, crimpers, connectors, global adapters, polarity indicator probe, fax machines interconnect, xenon and...
  5. Externet

    A Phony Question

    Never :oops: Thinghy worked flawless for years. Perhaps there is a limit to the 'leak' current, or, If current is not enough to seize the line; nobody cares if there is a 'leak' current.
  6. Externet

    A Phony Question

    Telephone in-use indicator ? Did that 40 years ago for an office that had only one telco line. Everyone looked by the ceiling where the LED was before lifting the handset :D L1--------------------20Vzener--------------greenLED-----------/\/\/\/----------------L2 Simply in parallel to telco...
  7. Externet

    Miserable failure to solder XLR connector to mic cable!

    Did you use chinese solder ?
  8. Externet

    "Is this a new method for manufacturing printed circuits?

    Decades ago, I 'invented' my way too. :rolleyes: Ordered a rubber stamp with my circuit pattern
  9. Externet

    Advice required

    ---> https://www.amazon.com/s?k=bluetooth+camera&crid=37H9R4YISNQNR&sprefix=bluetooth+camera%2Caps%2C131&ref=nb_sb_noss_1
  10. Externet

    Advice required

    Would be unusual not to find the product. To make it with proprietary parts, will take something I do not know how to direct you. Here there is something related... ---> https://app.fujifilm-dsc.com/en/camera_remote/bt_connect_android.html
  11. Externet

    A Speaker OHM question

    Use the 6 Ohm as suggested. In case you were not aware; the 6 or 8 ohm factory rating is at 1KHz. And you will be listening to music at a very wide spectrum and at a very wide changes in amplitude. A tiny moment it will be 8 Ohm. Ignore impedances and enjoy the music. Also remember that...
  12. Externet

    Voltage regulator driving a pass transistor...

    This circuit using a LM317 does not raise its rated Vin beyond 40V by the presence/use of a higher voltage rated pass transistor Q1; right ?
  13. Externet

    Voltage regulator driving a pass transistor...

    Hello. A 3 pin regulator with a maximum input voltage of 35V and 1 Ampere capable like LM7815 can drive a power transistor to raise its current capability. Does the input maximum voltage for the regulator also raises as the pass transistor Vce specifications ? Or that input voltage increase...
  14. Externet

    Benefit from posting projects

    If there is total certainty it is not published before nor exposed on the web, you may try selling your projects to electronics magazines, if there is any left.
  15. Externet

    Data wall plate connectors

    A wall plate to pass cabling to the other side of a wall ? I would drill the wall or a blank plate... Or harder; make the wall plate adding the pertinent connectors on it.
  16. Externet

    How to eliminate 12V puck light LED flicker?

    Did you try to add a capacitor in parallel to the driver output ? -Or the supply for the LEDs ? (load line)
  17. Externet

    Chargers and batteries in series

    Four 6 V in series is 24Volts. Two 6V in series is 12V; you need only one 12V charger.
  18. Externet

    Help with kitchen receptacle

    Check the GFCI outlet is not tripped, hit its 'reset'. Check the breaker feeding those 3 outlets is not tripped, cycle to off and on. Check with your voltmeter if the bare wires at your 3 outlets are now active or not.
  19. Externet

    How do I make a pulsating light circuit?

    There is several flavors of self-blinking LEDs, and multicolor too. ---> https://www.amazon.com/Blinking-LED/s?k=Blinking+LED ---> https://www.ebay.com/itm/333769212111?itmmeta=01J50P488WWAY8577XHVDZJ0KE&hash=item4db63200cf:g:yH4AAOSwsaxfmS-T&var=542846451464 --->...
  20. Externet

    how to increase frequency from 50 hz to 60 hz in inverter circuit 4500 watt with transistor d718, no IC ?

    Saw the transistor data sheet here ---> https://alltransistors.com/transistor.php?transistor=19953 The frequency generating circuit section is not in your drawing. Has to be somewhere connected to a pin of the three shown. Is it a grid-tied or off-grid ?
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