Search results

Search Forums New Posts
  1. kellys_eye

    LG OS 5020

    I'm sorry to hear that.
  2. kellys_eye

    Can the secondary voltage of power supply transformer be determined by the double 25volt caps?

    35W @ 117VAC also means 35W @ whatever the unit uses so assuming a 9-0-9 transformer (total 18V) this would be at 2A (36W but near enough). Larger is ok but only if your pockets are deep enough........
  3. kellys_eye

    Can the secondary voltage of power supply transformer be determined by the double 25volt caps?

    IC's 3+4 look to be the main supply line regulators potentially from the 78** and 79** series regulators (or the Japanese equivalent range). The input is indeed a spit-secondary AC transformer output (12-0-12 most likely - or perhaps 15-0-15 less likely). The 'raw' DC from the bridge...
  4. kellys_eye

    Electronic flourescent tube starter

    Well you have the schematic and seem intent on building one (or 15) so please let us know how you get on! The ball is in your court (as they say) so please forgive the ramblings whilst we await your success - or otherwise. Or is there something else about the circuit that is puzzling you?
  5. kellys_eye

    Can the secondary voltage of power supply transformer be determined by the double 25volt caps?

    ....after a fruitless search I couldn't find the schematic for the KR350 but other types of similar keyboards use transformers with MULTIPLE secondaries so I would doubt whether yours has a single secondary either - which makes posting pics that much more important.
  6. kellys_eye

    Can the secondary voltage of power supply transformer be determined by the double 25volt caps?

    Only to the extent that the voltage can be 'anything' UNDER 25V (with appropriate safety margins this could be 'anything' under 20V). Are there any other component parts in the power supply? If not then the actual regulation is done in the keyboard itself. What the designers try to do is...
  7. kellys_eye

    Electronic flourescent tube starter

    Not quite sure why you would want to use an electronic starter at all anyway. If I was at all bothered about 'quick' starting I'd be replacing the tube themselves with LED versions. New fluorescent tubes with the bog-standard starters usually light up at first flicker (or maybe the second)...
  8. kellys_eye

    Electronic flourescent tube starter

    The same department would likely sanction you for mis-gendering someone these days. Darwin's Law used to be all that was required - now we have whole departments to stop people acting like idiots.
  9. kellys_eye

    Issues with kenwood KAC-511 1000w amp

    Seconded. Being a Class-D amp you will have an SMPS in there (especially since we're talking 100's watts and the case is 'small').
  10. kellys_eye

    Issues with kenwood KAC-511 1000w amp

    The subs will have a label (or at least should have) that states their impedance (ac resistance). Common vales are 16 ohms, 8 ohms and 4 ohms etc. Your amplifier will have a power output rating of x-watts into x-ohms. You can connect as many subs as you want provided you keep the total...
  11. kellys_eye

    Issues with kenwood KAC-511 1000w amp

    I think he was referring to 12-INCH subs - not actually 12 off subs!
  12. kellys_eye

    Multimeter Blues...?

    I've used a multimeter (of many different manufacturers) for over 40 years and have NEVER used gold-plated contacts - for any other purpose either..... It's 'audiophoolery' for test equipment. Don't waste your money.
  13. kellys_eye

    Relay with separate switch integration

    Not entirely sure of that 15A switch wiring....... are they two separate sets of contacts and, if so, which wires represent which switch? Are the two red wires one switch and the two black the other? Or do you wire pos and neg on one pair (in) and take pos/neg (out) on the other pair? Get it...
  14. kellys_eye

    Controlling of/off an actuator that has a stepper motor

    If all you want is a fully-open or fully closed condition then send either 10V or zero volts to the device. All you require is a 10V source that can be derived from the 24V using a simple regulator or even a zener diode.
  15. kellys_eye

    How will a car 10A circuit deal with double load?

    Valid point as there are legal values for lighting in cars.....
  16. kellys_eye

    Video signal DC level adjustment

    Query.... Not the first time I've see this in a post but I can't replicate it by using the quote function so show a screen cap of the output that's displayed on my screen when I look at that post. Note the inclusion of two (spurious?) IP addresses that have appeared. Anyone explain why this...
  17. kellys_eye

    Multimeter Blues...?

    Note that all those controls have one side grounded. Often this ground may include a connection to the body of the variable control (metal casing of the potentiometer). In any case you need to confirm that the ground is attached and continuous throughout the wiring as 'lifting' the ground...
  18. kellys_eye

    How will a car 10A circuit deal with double load?

    The fuse protects the wire and nothing else. If the fuse is rated at 10A then so is the cable - else they have 'broken the rules' on cable selection and/or fusing. I very much doubt they'd risk litigation by not complying with the regs associated with low voltage DC wiring.
  19. kellys_eye

    DVD drive to usb

    I have one of these: https://www.amazon.com/Generic-Adapter-Converter-Optical-External/dp/B002OV1VJW Let's me connect to 'any' type of old drive I have and also incldes a separate PSU for those devices that a USB port cannot power. Never failed me.
  20. kellys_eye

    Freq Generator

    Those radios also use a fixed voltage divider (long chain of resistors) to set the band of operation as well as a variable resistance to deliver a tuning voltage. There are many, many examples of this type of receiver these days. The tuning resistor (variable) is often connected to the tuning...
Top