Recent content by bob.steel

  1. B

    Coronavirus transmission prevention device.

    BUT .....I'm wearing it none the less.
  2. B

    Another Newbie question about Power supplies

    Set amperage at 500 mA and set voltage at 9 volts . Watch the little light . If it is being current limited the light next to that value will be lit . If it is being voltage limited then its light will shine for all to see.
  3. B

    12volt solar power cables

    Before you go I saw one system on Instructables here that ran a small freezer and a TV and a computer . Not cheap to set up and running on 48V but definitely doable for under probably USD $3000. Another cheaper one here running on 24V probably USD $500 Those types of inverters don't seem to last...
  4. B

    Ebike battery

    Yes I think making the thing with 18650's is a waste of time and effort when you can buy made up scooter packs on ebay and ali ready to go with the required output voltage and controllers and chargers to suit. If you just want to learn then join here perhaps and read ,read,read first. There...
  5. B

    Solar Controller 12/24 V

    Ok fine . Learnt a new device today . Cant get much better days than that. The controller works fine once the MOV was removed so Ill try to get a replacement and put it in. Thanks again .
  6. B

    Solar Controller 12/24 V

    No sweat . Thanks. I resized but there are a couple more I will try to put up . Can you take a stab at a value I could try? I can't get a circuit . Input voltage is said to be 50V max . I don't see any obvious fuse . Current from the panels will be about 16 Amps max and 66 Volts max
  7. B

    Solar Controller 12/24 V

    Some more pics Ridiculous . Why wait until the whole file is uploaded before saying Obviously you have a size limit but why not put the size on the error notice Where do I find the size limit?
  8. B

    Solar Controller 12/24 V

    I have blown my controller by putting too much voltage into it via the PV panels 67 volts instead of under 50 . Looking inside I see only one component is toast . It is marked on the board as ZR1 I assume its a zener although the package looks like a polyswitch. What do you think it would be...
  9. B

    TVS Transient Voltage Suppressor

    You know I would just like a straightforward answer . I know how a zener works. Does the diode conduct ONLY when the voltage spike passes 1.5Kv ? Does the diode conduct ONLY the equivalent of 1500 watts ? So if the voltage were 1.5Kv the current passed would be 1 amp only any more and it would...
  10. B

    TVS Transient Voltage Suppressor

    But "Does it only conduct if the voltage goes over 1.5K v or does it only conduct if the current goes over 350 amps?"
  11. B

    555 timer ?

    Most 555 timers have an input voltage DC limitation of say 5V.-12V Is it possible to place it in a 300 volt circuit in any way by limiting its voltage with resistors and the amount of current flowing to its sense triggers?
  12. B

    TVS Transient Voltage Suppressor

    This device given a part number of say '1.5KE350' I have not used before . I understand it to be just a zener diode in fact but it won't conduct until it reaches 1.5K volts ,is that right? Its noted as 350 amps so I'm confused . Does it only conduct if the voltage goes over 1.5K v or does it...
  13. B

    SM12 ?

    No its just a straight forward question . If its not familiar to you straight off then you probably won't be able to help.
  14. B

    Coronavirus transmission prevention device.

    Crikey what a cranky old grouch in his armchair at home !
  15. B

    SM12 ?

    I have a circuit with a dc photovoltaic string of about 280 volts feeding into this. The circuit calls for a SM12 chip with I think 4 pins. I guessed it was a voltage regulator of some kind but all the googled datasheets give different devices and none seem to fit this . Can anyone tell me what...
See more
Top