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  1. kellys_eye

    data display Led board help model bli-232 m/c

    Google for 'dot-matrix message board hacks'. You aren't the first to get hold of one of these things but the electronics in them IS adaptable if you identify the basic serial (it's all shift-registered) points. When I got my board (a red/green bi-colour dot matrix with 80 displays of 8x8 dots...
  2. kellys_eye

    Making bad audio better

    You've obviously never met my wife......
  3. kellys_eye

    Powering my project with a 7.4v battery

    The protection board connects to the two cells as per the drawing shown on the advert.. There are two pads on that board (P- and P+) and these connect to the output of the charging board (TR5100) where it says 'lithium battery + and lithium battery -. You MUST solder a short on the link...
  4. kellys_eye

    Making a floodlight from the CCFLs from many broken monitors - need >1.2A, 700-1000V inverter

    Have you checked out the drive requirements for CFLs? This article explains how 'complicated' they can be. https://www.digikey.com/en/articles/techzone/2014/jun/driving-cfls-requires-unique-voltages-sequencing-and-attention-to-emi-pfc-and-faults If you use different size CFLs they will...
  5. kellys_eye

    data display Led board help model bli-232 m/c

    You might have a problem. I've come across these units before and some are fitted with programming EPROMS with the characters sets and preset messages. Apparently you can get an EPROM that offers a 'free running' facility (so you can send your own messages) but of course it's an extra cost...
  6. kellys_eye

    LED getting hot

    At 1.5 to 1.6V (forward volt drop) and 140mA, each LED is dissipating around 200mW. You've got 35...... so about 7 watts of heat. That's substantial. I've got a 3W LED reading lamp that gets nearly too hot to touch under normal running. 'Warm' is perfectly normal.
  7. kellys_eye

    Reversing Motor Direction With Relays

    Not 'un short' but GROUND the pin.. leaving it 'un shorted' is called 'floating' and it tends to float 'high'.
  8. kellys_eye

    Making a floodlight from the CCFLs from many broken monitors - need >1.2A, 700-1000V inverter

    Wow.... 1.2 amps and 700-1000V is a 1kW+ inverter...... not an easy prospect - not cheap either. LCD monitor CFLs aren't the way to do it anyway, fragile, different lengths etc. which may mean different strike voltages and an inverter with multiple outputs..... Considering you can buy 100W LED...
  9. kellys_eye

    Building an electronic foil surf board

    Adding to my previous comment: That motor is rated at 150watts. If you want to run it for 1 hour you need 150 Watt-hours of battery storage (plus some extra for system 'losses' and redundancies) so for a 1 hour run period you need (say) 200 watt-hours of energy. If you use a 24V motor this...
  10. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    Such ignitors will usually only run whilst providing the ignition spark - once the pilot light is lit the power to them is usually removed.
  11. kellys_eye

    Identifying connector (power?)

    Not easy to determine - many manufacturers re-badge their equipment for other distributors so there is sometimes cross-platform parts equivalence. Even if the connector were to be available after-market you can bet your life it would be at a cost you wouldn't want to pay! If you can't get the...
  12. kellys_eye

    LED getting hot

    Much confusion here..... are you 'complaining' about the LED's getting hot or the POWER PACK getting hot?
  13. kellys_eye

    Reversing Motor Direction With Relays

    The relay (via that driver board) will either operate with a high or a low signal (it doesn't spec which other than a 4mA requirement that 'may' signify being pulled 'low' by a logic port). You can do no harm by testing the board stand-alone. With the 12V supply attached (Vcc and GND) use a...
  14. kellys_eye

    Issue in running BLDC motor with microcontroller

    Torque will be a function of the voltage/current supplied to, and the inductance of, the driven load. The issues of LACK of torque parallel those when driving stepper motors and usually require a modified drive waveform - multi-level steps instead of straight 'square waves' that a PWM signal...
  15. kellys_eye

    Building an electronic foil surf board

    If the OP's suggestion to use a hydrofoil is true then that motor certainly won't provide the speed required to get lift. I saw a recent video of a hydrofoil-type board and they were travelling at at least 20kph! Mind you, it looks oh so impressive when it happens! If the vertical blade from...
  16. kellys_eye

    Trying to re-purpose high voltage power supply. Need help

    Now that's steam punk taken to a new level! Brilliant!
  17. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    The devices are different so checking the other won't help. The picture reveals the 'other' device to be a thyristor, not a transistor. The bottom of the board is covered in cr@p. Clean it off and resolder the joints - there looks to be at least one 'dry joint' there that could be the cause...
  18. kellys_eye

    Reversing Motor Direction With Relays

    What kind of power adapters? Linear or switched mode? Voltage and current output?
  19. kellys_eye

    LED getting hot

    250V 3a 24 w??? Something wrong with that. Is that 3A at 24V or 3A and 24 WATTS (which would mean an 8V output).
  20. kellys_eye

    LED getting hot

    What are you using as a voltage regulator to drop from 13.2V to 12V. You might be getting oscillation if it isn't designed properly and thereby drawing more current (and producing more heat) than you expect.
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