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  1. quantumtangles

    Tektronics 2465 Ocscilloscope Repair

    A parts or repair Tektronix 2465 Oscilloscope (Ebay...collection only...$50 dollars) passed the Earth Bond and insulation tests for Class I devices. I plugged it in before inspecting it internally (my first mistake). After the smoke cleared, I pulled out the power board (photo 1) and saw two...
  2. quantumtangles

    Woo-Woo Energy loss In a circuit?

    The best way to get overunity cultists to understand the laws of thermodynamics is by referring to a hose. The most hardcore overunity cultist will be forced to accept that one cannot get more water out of the end of a hose than one introduces into the beginning of the hose (from a tap for...
  3. quantumtangles

    Building a device from a schematic (Yet another work in progress)

    Tempting to look in my parts bin for a 555 timer. Beautifully written...nice to get a clear explanation from first principles. Thanks Steve.
  4. quantumtangles

    Compiling Linux Kernels

    Heralding the 25th anniversary of the Linux Kernel, would be interested to know if members compiled their own kernels to mark the occasion, how you went about it, and what your experiences were.
  5. quantumtangles

    Raspberrypi bluetooth file trasnsfer to android phone

    Amusing candidate solution. From a linux box, burn an ISO of Android 6 using k3b or similar burning software. You should be able to burn an ISO of Android 6 using WindoZe as well, if you can bear it. I installed Android 6 on an i7 desktop PC, and to my surprise, it installed and it was very VERY...
  6. quantumtangles

    Hybrid Electric Engine

    Hi All. Daimler forwarded the idea to their joint heads of engineering before sending me a polite letter to the effect that they did not intend to buy the patent. Their letter was signed jointly in manuscript by both their heads of engineering..electrical and mechanical). QED. Had data been...
  7. quantumtangles

    KAWAI Digital Piano won't turn on

    Do not attempt this unless you are safety certified and have electrical engineering expertise. Wear protective gloves and do not use both hands near the circuit. Use a high voltage certified multimeter. In fact, do not attempt this repair unless you are safety certified. The safest option (not...
  8. quantumtangles

    Heat issues with car head unit

    If you have a schematic, check the voltage rails. If the voltages are as they should be, some suggestions. 1. The 10v 100uF Polymer electrolytic capacitors in the photos may be rated for 85 degrees C. Replacing them with 105C caps is tiresome but may help if hot air from the engine affected...
  9. quantumtangles

    Yamaha RX-V496RDS problem

    A further idea. There is an excellent video on Youtube by Dave Jones from Australia (EEV Blog) about tracking down defunct ICs (in this case Op amps) that failed due to over voltage arising from a defective power supply rail. He iterates that 'under voltage' issues can never cause problems with...
  10. quantumtangles

    Rest in Peace, Kris

    Dreadfully sad to learn Kris passed away. What a terrible terrible shame. An utterly brilliant mind and so patient with everyone, experts and newcomers alike. Everyone here present is diminished by his loss, just as will everyone else will be diminished in perpetuity. What I would have given to...
  11. quantumtangles

    Yamaha RX-V496RDS problem

    Good advice to which I add my fascination with such devices led me to what appears to be the service manual for this attractive machine. I make no warranties as I did not attempt to download the manual but here is the link in the hope it may be of help...
  12. quantumtangles

    Switching Power Supplies

    Thanks Steve. Awesome answer. The thread on SMPS is fantastic. Beginning to find switching power supplies fascinating :D
  13. quantumtangles

    Switching Power Supplies

    As I understand it, the essential requirements for a switching power supply are: Gated oscillator (anywhere north of 100kHz) x 1 Operational amplifier x 1 Voltage reference Resistors x 2 (voltage divider) NPN (darlington pair) series pass transistors x 2 Filtering Caps x 2 for input and output...
  14. quantumtangles

    Hybrid Electric Engine

    Hi Bob, When running on electric power, the ICE pistons are disconnected from the crankshaft. Thanks for all the other comments.
  15. quantumtangles

    Hybrid Electric Engine

    John, I have no data at the moment. I readily accept that objective peer reviewed data is essential.
  16. quantumtangles

    Hybrid Electric Engine

    Engineering is not about what people want to hear. It is about reality. I warmly welcome your observations, outwith the fact I do not agree. It is different from a simple motor generator set because when connected to an internal combustion engine or impulse turbine, a permanent magnet is caused...
  17. quantumtangles

    Hybrid Electric Engine

    You are most welcome Mursal. When you move a cylindrical magnet up and down inside a solenoid, alternating current is generated. If you attach such a cylindrical permanent magnet to the crankshaft of an internal combustion engine, turn on the internal combustion engine and allow the...
  18. quantumtangles

    Hybrid Electric Engine

    Thanks Duke. Magnetic force is low unless the permanent magnet cylinders are very close to the switching electromagnets when pulsed power is delivered. In other words, the magnetic gap must indeed be small and that is the basis of the idea. Fractions of a millimeter are well within current...
  19. quantumtangles

    Hybrid Electric Engine

    Just had a patent for a hybrid electric engine and alternator motor published here: http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=2505082A&KC=A&FT=D&ND=3&date=20140219&DB=worldwide.espacenet.com&locale=en_EP Would much appreciate feedback from the serious minds...
  20. quantumtangles

    Sony BDV-E300 Blu Ray Home Theater

    This is the manual for the device (unfortunately not the service manual). http://www.sony.co.uk/support/en/product/BDV-E300/manuals Fairly useless. Service manuals (containing schematics) are on sale from about $15 dollars from...
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