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  1. kellys_eye

    Battery Charging in Inverter

    You have an opto-coupled triac driving the main triac to switch the load on/off. If the opto-coupled device isn't working then the main load triac will never trigger. What's driving the opto-coupler?
  2. kellys_eye

    Unlicensed Radio That Will Transmit Continuously

    You need to look at LORA systems then. Compact, low power, no license, large user base etc.
  3. kellys_eye

    RCA F19207BC (CRT TV) shuts itself off even after new HOT install.

    Do you know what the coil resistance is meant to be and/or can you measure it? You could send the drive signal to a fixed resistor of a suitable value to check the deflection drive. You might have a shorted coil.
  4. kellys_eye

    PWM issues when powering 4X 4pin 12v fan

    Is there an electrical path from the power (ground) pin to the signal output 'ground'? Got a link to the PWM device you're using?
  5. kellys_eye

    DIY electromagnet

    To a point. You have to consider saturation as well as the coils own inductance (its ability to resist the rate of change of current flowing through it). Read up on inductors and magnetism and you'll find the technical details on the how's and why's of solenoid construction plus their ability...
  6. kellys_eye

    PWM issues when powering 4X 4pin 12v fan

    Are you changing the pulse WIDTH to regulate the speed or pulse FREQUENCY? It should be 'width' (i.e. the % setting). The frequency setting may also be applicable - have you got the spec sheets for the fans?
  7. kellys_eye

    Unlicensed Radio That Will Transmit Continuously

    Yes, but that is modulated AND licensed in some countries (or, at a minimum, on a permitted frequency). I suggest you consult your local authorities as each country differs. In the UK, OFCOM publish a set of rules/guidelines most of which I haven't bothered to consult so could be talking...
  8. kellys_eye

    DIY electromagnet

    Doubtful - probably 30mS if you're lucky. Then again, what's the point? If you can even get a 'millisecond' movement time you have to consider the loads involved. Getting a sub 1-second movement of a 10g weight is a lot easier than getting the same sub 1-second movement for 1kg - what weight...
  9. kellys_eye

    Unlicensed Radio That Will Transmit Continuously

    Without actually checking I would suspect that there is NO unlicenced radio that is actually ALLOWED to transmit continuously - such transmissions usually require licencing. I suspect that continuous transmission is referred to as broadcasting which is a different thing and usually under much...
  10. kellys_eye

    switch mode power supply makes a clicking

    What was originally wrong with it and what did you do to fix it? I'd use IPA (isopropyl alcohol) to clean up the flux around that IC first....... and fix Q1 to the heatsink properly too.
  11. kellys_eye

    Antenna Repair & Replacement

    You are unlikely to find an identical replacement part unless you ask on a radio-specific (vintage radio repair etc) forum to see if anyone has one. The usual method is to take the relevant measurements and fit the next-best-thing.
  12. kellys_eye

    DIY electromagnet

    Far simpler to purchase one of the correct rating (voltage, pulling power etc)
  13. kellys_eye

    Cat 6 Ethernet Cable data restriction?

    There's nothing wrong with using a DIY cable - but you MUST use the correct components i.e. decent cable, decent connectors etc. Clearly your cable is lacking (aluminium core) and we don't know your proficiency in making off RJ45 connections. Even leaving 'too much' of the ends untwisted when...
  14. kellys_eye

    8 and 6 ohm speakers

    The intent was to achieve a 'workable' load rather than secure the perfect power transfer.
  15. kellys_eye

    8 and 6 ohm speakers

    Two 6-ohm speakers in parallel give you a 3-ohm speaker. Wire those in series with another 6-ohm speaker (with due regard to polarity) and you have a 9-ohm speaker. This won't affect your amplifier and will not be noticeably different from an 8-ohm speaker.
  16. kellys_eye

    Cat 6 Ethernet Cable data restriction?

    A 25-metre ready-made CAT6 cables cost $15 - is there a reason why you can't (or aren't) using commercially made and guaranteed products?
  17. kellys_eye

    Cat 6 Ethernet Cable data restriction?

    You certainly don't have 'quality' cable then and are seeing the consequences thereof. Regardless of the speed supplied, what is it you're doing that requires the full rate? I know of no tasks whatsoever that require 300Mb/s - even downloading (streaming) HD from Netflix only requires 5Mb/s...
  18. kellys_eye

    RCA TV polarity question

    The image of the adaptor in the user manual seems to show a data 'plate' on the back of the power pack and I can 'just' see the info that MAY include the polarity!
  19. kellys_eye

    8 and 6 ohm speakers

    It won't be 480W that's for sure - the manufacturers always quote 'peak music power' to give their amplifiers the impression they are higher powered than they actually are. What is the amplifiers RMS power rating? As for the speakers.... you do know they are POLARISED and that connecting them...
  20. kellys_eye

    Relay

    Short answer is no. Longer answer needs to determine what the door solenoid power supply is and how it is connected to 1&2 hence the requests for additional information as in posts above.
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