Audio qualia

experience the real sound of music !

radio tuners

This page is concerned with improving the Leak 'Troughline' tuner.

 click right button on your mouse, then 'view image' to see enlarged view of circuit diagram.


The problem is that my version of this superb tuner is mono only, and it doesn't have a stereo decoder, or a multiplex signal output (one that contains both signal channels and a pilot tone, @19kHz). I will have to take an output from the tuner, and feed it into an external decoder; I have a Hitachi FT5500 I can use as a donor.



 At Christmas, whilst shopping for food in Tesco's, I spied an FM transmitter, the kind one plugs into a sound source, and it sends out an FM transmission at any frequency between 87.6 and 107.9 MHz. Range is only 5 metres, but fine around the house. I am currently using it to assess the BBC's Radio3 programmes broadcasting in HD, at 320kb/s, and even on the computer room system, it sounds pretty good. Certainly better than a straight FM broadcast.

Makes me wonder if this is the way to go, with a better transmitter, so even if the government switch off the FM band, or let others have it, I can still have music via my tuners!


The batteries (2 x AAA) have just run out, they didn't last long! but I found a little charger type supply, which I plugged into the transmitter, et voila, sounds again, but, accompanied by mains hum. Into the bag of bits for a capacitor, chopped and stripped the wires, added the cap (0.47µF poly) and hum gone, just a little residual 100/150Hz to deal with, maybe a smallish value electrolytic will do.


new blog

Sorry for these problems

The powers that overlord this website have threatened to deactivate this site for being too popular, without them getting their pound of flesh. Over the last several weeks they have withdrawn the stats counter, so that I cannot monitor the bandwidth, which is now over their specified limit. They have now stopped any change to any pages except this side panel.

So I have had to set up a new forum so that I can continue to help the hifi community. The new forum will be here:


All the pages on this site, and many more, to found on the new site.

Hope to 'see' you all on the new forum, opening soon. Dated 21 Sept 2012

the second audio qualia site continues, here:

script change history

there have been problems with the editor for, which has resulted in no new material being able to be added. So this site will remain open until the problem is fixed, but another site will be constructed to host a more practically based one. Hope to see you there, details as soon as I have found a stable platform (sounds like hifi!) kindest regards   Cats.

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