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  1. flippineck

    Looking for 1990 Kenwood A-54 amplifier parts

    VR1 master vol appears to be listed as "100KB", twin gang, with two wipers per gang (maybe one's a trimmer?) No indication of lin or log. It's also shown as ganged to a diode, maybe that's the flashing LED on the knob. Also there appears to be an integrated motor and motor drive IC 'IC3' VR2...
  2. flippineck

    Looking for 1990 Kenwood A-54 amplifier parts

    Fault symptoms: Volume knob (which is motorised and can rotate under IR remote control command) has a number of regions of travel where loads of dropout (R, L and both channels randomly) occurs upon movement. Can only reliably set volume at certain levels. Dropout also occurs sporadically when...
  3. flippineck

    Micro soldering

    I'm embarking on a harebrained project to try adding a decent RF connector to a smartphone that doesn't have one. It's a Samsung Galaxy S3. It has a test RF connector on the circuit board which is accessible if you remove the battery cover. It's not a socket though, it's a purpose designed test...
  4. flippineck

    String Theory

    So this begs the question, what exactly is energy itself? and the really queer part to me is, this bit about how it can spontaneously come into existence from nothing.. I'll have to go & google the process but it's somewhat related to something called 'hawking radiation' I seem to recall...
  5. flippineck

    String Theory

    Well it kinda intrigues me as to what these strings are made of I keep coming back to thinking of an electromagnetic wave travelling in a vacuum. There's no actual substrate there, but the wave still exists, it uses the magnetic and electric fields to propagate right? So.. what is the...
  6. flippineck

    String Theory

    It says no heated discussion of religion / politics so excercise restraint, but, please discuss string theory. Little tiny wigglers that are the basic building blocks of everything. Fascinating. But, is it possible to discuss without bringing in the maths?
  7. flippineck

    'Soldering press'?

    Could something be incorporated using flywheels / gyroscopes? Sort of like a robotic arm but with each of 3 degrees of freedom stabilised by a small but heavy spinning wheel. Maybe yoyo sized. So you could still use your hand for fine guidance but, the soldering tip would not respond to...
  8. flippineck

    super capacitor capacity?

    In the charging circuit could one arrange things somehow, such that the electromagnetic output from the transmitter coil is focussed toward the receiver coil, to counter the inverse square law, some kind of simple parabolic reflector or something?
  9. flippineck

    Ultra low power 3g repeater?

    Shumifan50 - you were right - dug & dug & dug some more & it turns out there IS a connector accessible without breaking open the phone. It's well hidden & has an almost invisible black sticker over it. I don't want to maul about with it too much though, It's circular, about 2mm in diameter and...
  10. flippineck

    Ultra low power 3g repeater?

    New Samsung Galaxy has class A-1 access to the antenna: http://www.ifixit.com/Teardown/Samsung+Galaxy+S5+Teardown/24016 The price is not so beautiful though :-( Is there a timeout on post editing in the new theme? otherwise, I'd have just edited rather than bump..
  11. flippineck

    Ultra low power 3g repeater?

    Checked with Sony & didn't trust their negative answer so googled for days; it's pretty definite the only way to get a direct connection to the xperia E antenna is to strip the phone to get at the connectors on the pcb. I found this, which is pretty much what I want to do, but.. I have a gut...
  12. flippineck

    How to strip the insulation off 3 core main cables?

    I never know quite what to do with the thicker coax cables usually make it up as I go along
  13. flippineck

    How to strip the insulation off 3 core main cables?

    I spent some time at a local college doing a city & guilds 2360 course as a trainee electrician. There, the method of nicking it around the outside & then bending it open was massively frowned upon because of the danger of damaging the insulation on the inner conductors. They taught the method...
  14. flippineck

    Ultra low power 3g repeater?

    Thanks chaps The cellboosteraustralia.com link is exactly the sort of thing I've been looking at and really tempted by. The only thing stopping me getting something like that is, I think, they're heavy duty illegal in the UK? It claims to be able to cover an area of 300 square metres, so I'm...
  15. flippineck

    Ultra low power 3g repeater?

    Great link thanks Steve. Trouble is, the femtocell approach seems to rely on you having a stable broadband connection already, probably over a landline or cable or something. My primary access to the net is purely via the mobile network - so femtocell doesn't really help me. There *is* a half...
  16. flippineck

    Ultra low power 3g repeater?

    I have bad cell signal inside the house but reasonable outside. My phone is a sony smartphone that does not have an external antenna socket. After a whole bunch of experimentation I found, using different kit (a mobile broadband router that does have external antenna connector), that an...
  17. flippineck

    to make an LED blink

    don't know what this might be, it seems to be some kind of very compact, discrete 3-terminal semiconductor device. maybe something similar could help you, maybe someone might know what it is: http://www.hlj.com/product/hqpbl-unit/Sup this one's 1.8Hz with a 50% duty cycle so, roughly one second...
  18. flippineck

    Air conditioning on a budget

    well you're half right (as Morrissey said)
  19. flippineck

    Air conditioning on a budget

    Naaaaaaa You just rig up an antenna, any old antenna will do, it's going to resonate at some frequency or other right? Then just stick a diode in the transmission line. Rig up say a few hundred, and feed the resultant pulses into a battery. end up with a battery full of electrons in no...
  20. flippineck

    rf transparency of plastic

    thanks guys, so i should be ok then these are the plans i'm working off http://martybugs.net/wireless/collinear.cgi but am using wavelength 16.65cm for 1800MHz and 37.47cm for 800MHz I read somewhere that the loops are actually "quarter wave delay lines" designed to feed each half-wave...
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