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  1. Externet

    Possible to add a beeper to this circuit?

    Yes. Use a DC one that works from 3VDC to the desired node capable of driving it. ----> https://www.ecosia.org/images?q=dc%20piezo%20buzzer%20beeper They should be under $2. Also canibalizable from defunct equipment.
  2. Externet

    110v strobe flasher circuit help

    Pick your flavor Plug your 110VAC to 12VDC adapter to the outlet to supply your flasher.
  3. Externet

    110v strobe flasher circuit help

    Make a supply that converts your desired 110VAC outlet to the voltage the strobe flashers you found abundant work at. :rolleyes:
  4. Externet

    Is it possible to repurpose transducers from normal headphones to use them in a diy sleepphones?

    Yes, cut the headband off; or get these : ----> https://www.ecosia.org/images?q=pillow%20speaker
  5. Externet

    Interesting Video On Electricity

    Almost 25 years ago, I enjoyed this explanation I just searched again in order to submit this post, is still present on the web : ----> http://amasci.com/miscon/whatis.html Am happy it is still available. There is many branches in the subject, abundant links within the tutorial, each one...
  6. Externet

    220v vs 110v question

    Ask the UK about wiring the peeler for 110V ! If not possible, the outlets your clothesdryer, range, water heater... work are 220V and can be extended to your peeler, or a new circuit breaker added in your panel can supply a new dedicated outlet.
  7. Externet

    Single phase motor - wiring questions

    If the manufacturer/vendor refuses to clarify things; There is a safe guessy way. Connect your single phase source in series with a largish incandescent light bulb and try educated combinations of wiring. Phase-------------------100+W light...
  8. Externet

    Semiconductors and heat

    Modern semiconductors may have better construction for heat resistance; but their much smaller size may counteract their heat dissipation capabilities and if I have to guess, not much better after all put together. Heat is one thing, different to temperature. Do not confuse them. In 1979...
  9. Externet

    Easy pulse generator

    Trying to understand you; a single component only being a capacitor; will pass a short pulse from many pulse width inputs. It is called a differentiator. Any widht pulse >-----------------------||------------------------> a 'short' pulse out >---------/\---------- ---->...
  10. Externet

    Old 'travel adapters'...

    Hmmmm. Not about the plug/outlet type; about the voltage converting from 230VAC to 115VAC Images ----> https://www.ebay.com/p/1218804811?iid=203210805052 ----> https://www.ebay.com/itm/373726169199?hash=item5703d0c86f:g:LHIAAOSwkMhfLwIQ
  11. Externet

    Another Tektronix 2235 troubleshooting.

    That model oscilloscope has the nastiest most convoluted complex switching power supply circuitry I have worked on. Use visual/nose detection of components burned and relate to schematic. Barely remember a small electrolytic capacitor at the edge of the printed circuit board failed often in...
  12. Externet

    Old 'travel adapters'...

    Hi. Decades ago, I used to come across power travel adapters, for converting 230VAC foreign outlets to 115VAC as for U.S. shaver, hair dryer... They were surprisingly light, vented with slots but never dismantled any to find how they worked. What do you know about them ? Are modern ones...
  13. Externet

    Solar radiator fan

    Welcome. If the solar panel is also 12V nominal, it should work fine by connecting directly, if all being DC.
  14. Externet

    How to measure amperage on a solar panel

    That is defined as short circuit current. ----> https://www.pveducation.org/pvcdrom/solar-cell-operation/short-circuit-current
  15. Externet

    How to measure amperage on a solar panel

    If you do know they are 100W each in parallel, you need a 200 W load and DC ampermeter in series to measure maximum capability. If the load is not 200W, you still need an ampermeter in series to your load of choice.
  16. Externet

    delay on timer

    Check if your 555 can work or barely work on 3.3 Volts
  17. Externet

    Need Help on Cord repair...How can this be?

    Does it need to be submerged for the wheels to move ? Are you planning second diagnosis with cable cutters or with multimeter ?
  18. Externet

    Potentiometer

    Something happened to AliExpress site and I get it only in korean, you will have to dig deeper or learn it... :-( ----> https://ko.aliexpress.com/item/32760020962.html?src=bing&albslr=222322000&isdl=y ---->...
  19. Externet

    Assistance required to find a short in a simple electronic board

    What does "a short" mean to you ? Scrub the board with alcohol and brush; dry in front of a fan a few hours and retry.
  20. Externet

    Need Help on Cord repair...How can this be?

    I do not know whatever you call a "short" To diagnose a cable, you use a continuity meter, not a cable cutter. To repair something, you must know how it works , otherwise is not repairing, it is guessing.:(
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