audio-talk

I took the liberty of having a play with it - didn't take long - so this is my tidied up version - yes it has a Voltage of X4 (12 dB).


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Second problem, you've got '-12V' for V3 (and you don't need the 'V'), but you're already using its negative terminal for the supply rail, so you've inverted it and made it +12V. As it is, just needs '12'. V2: again don't need '+12V', just '12'. The text box value is a Voltage by default, so don't n...

Whoah I've just noticed something, R2 is 1 milliohms!

That's a virtual short circuit.

I presume you meant 1 Megohms, so you have to write '1meg' or '1Meg' (can't be an 'M' on its own, and no spaces).

Yeah it's alright! Sounds very smooth. Bass is all there and not flabby. Treble is clean with good detail, and not 'in yer face' with it (what Phil calls 'transistor ear'). Trivia - Supply Voltage is bang on 45V. Amps' output DC points bang on 21.5V. According to the Fluke, there's 3.5 mV of hum, or...

Detail, left amp board and copper screen - transformer is closerer on that side - - Fg810 Wiring -005.jpg - Bottom of case, rubbr feet, and M5 screws into captive nuts to secure chassis - - Fg810 Wiring -006.jpg - Plugged in and making ack-chool noises! http://livinginthepast-audioweb.co.uk/imagex/m...

And suddenly it was finished. Last wiring was input screened leads, and quite fiddly. Pix ... - Fg810 Wiring -002.jpg - More lacing cord at the back. Green board on the right is for a 555 timer to flash the front panel LED when speaker relay is off, e.g. start-up delay. - Fg810 Wiring -003.jpg - Int...

Yes I would have thought 10k was plenty ... but to use one of my common sayings, 'only one way to find out'

Am watching, albeit not saying anything.
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That was brilliant, and I also like the forgoing general explanation of how semiconductors work and how they're made (doped).

Just a thought, take the 'V' out, after both the numbers.

I never use 'V' here, by default the field is a Voltage value.

On the graph, green should be 0 dB, if 'AC 1'.

Ray P wrote: ↑Mon Feb 12, 2024 6:37 pm Steve, I think you've done a cracking job there.Really pleased that you're getting such enjoyment from the RTZ. I think you deserve a

Gold star.jpg

Yups ...

Greg wrote: ↑Mon Feb 12, 2024 9:56 am

Cressy Snr wrote: ↑Mon Feb 12, 2024 7:35 am

Mike H wrote: ↑Sun Feb 11, 2024 11:02 pm Yes interesting. Where did you get the mesh from?

Wickes.

Also available at B&Q.

Thanks both, actually I now remember getting such from B&Q some years ago.

:lol: BTW, your tension’s a bit slack. :wink: Probably, only second time I've ever done it. :wink: Transformer is now wired up, and I made a copper screen to go in between the transformer and left side amp board. Then it was lunch time and YouTube took over ... :lol: Anyway shouldn't be much left to...

Yes interesting. Where did you get the mesh from?