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betocool

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About betocool

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    Western Australia
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  1. You're probably right....
  2. I struggle to think of Led Zeppelin and Amy Winehouse as "audiophile", it sound pretty honest to me. But of course, YMMV. Cheers, Alberto
  3. betocool

    DIY audio: what are you building?

    I found this record player / deck / AM / FM / Receiver / amp at the kerb the other day, and I'd been considering buying a motor for a turntable, just for kicks. The idea is to drive the motor using a microcontroller. It's a bit more involved, but lets you control the frequency. Anyway, I stripped the motor, and to my horror, it runs on 110V AC! This thing was wired in the box directly to the 230V AC using a capacitor to halve the voltage at 50 Hz. It works... but still! I was about to give up on the micro idea, I mean, it's pretty difficult to generate a variable frequency signal at 110V, so... then I remembered... transformers! More than meets the eye! A simple transformer can be used in both directions, either as a step down (usually) or a step down. I found a transformer I had lying around, 12V, and started measuring ins and outs. In the end, the final test setup looked like this: Phone: Signal generator 50Hz. Class D amplifier: Variable amplitude output (into the secondary of the trannie) Transformer TT motor connected into transfomer primary. I haven't finished measuring all I needed, current, power consumed, etc, but I get the motor turning at around 60V AC or so, and keeps nice and steady at 75 - 80 V. No need to get all the way up to 110. Another plus, I change the frequency on the signal generator and the speed drops / increases. All of 25 Hz up to 80 Hz, no problem. Means, I can get the micro to generate a signal 0 - 3V, any (reasonable) frequency, feed it to an amp, transformer, and motor... Done! Yes... there are simpler ways... but I want to keep this motor as it looks pretty robust, and it's dead quiet. It also has all mounting hardware included. All for the pricely sum of nix! Cheers, Alberto Edit: I am very well aware of the dangers while working with high voltages, but I know what I'm doing, I don't rush it, I wear safety glasses and make sure all is unplugged before doing any changes. Just for the record.
  4. betocool

    DIY audio: what are you building?

    I've been eyeing the K301 from them: http://oatleyelectronics.com//product_info.php?products_id=936&osCsid=4babfe72de7ee23a9eaf3f19e074d27e The price seems fair enough, with all components included. Happy to know which one is the other one! Cheers, Alberto
  5. betocool

    DIY audio: what are you building?

    @mwhouston, thanks for the information. Yes, if there's an update on the HP amp from Oatley I'd be interested. Don't mind a bit of soldering myself. I'm also considering their RIAA stage, but I'm still in two minds about it. Seems like I'm in two minds about a bunch of things these days! Cheers, Alberto
  6. betocool

    Beer: "proof that God loves us"

    I'm aiming for a Pils to refill my kegerator. I'm pretty sure that's the taste of the summer, right there. Of course, YMMV. Lager I find a bit dry sometimes, I don't mind ales, but I'm not too much into the bitter / hoppy beers. Plus, I haven't had decent pils in ages, so... Cheers, Alberto
  7. betocool

    DIY audio: what are you building?

    Dude, awesome work! More info please: - Boards: where did you get them (or are they your own?) - Enclosure, is it Jaycar? I really like your builds, simple yet very effective. Cheers, Alberto
  8. Best or not... setlist sounds mighty interesting! Cheers, Alberto
  9. betocool

    Currently Spinning

    And what are you discussing about? I'm a bit torn about getting the 50 year special edition 6 CD or whatever set. Seems a bit overkill. I enjoy the original very much though. Cheers, Alberto
  10. betocool

    DIY audio: what are you building?

    I may need to get me that phono pre. Reads very interesting. Maybe try some of the mods re power supply. Cheers, Alberto
  11. betocool

    Anyone else into BBQ?

    Good stuff! Same here tonight as the daughter turns 9. And she get to choose the menu. Cheers, Alberto
  12. betocool

    Pi music server and MoOde

    So, in layman's terms.... what's the significant upgrade between 3.x and 4.x? I've been running the same 3.something for a long time and am very happy with it. Cheers, Alberto
  13. betocool

    Currently Spinning

    This was on last night at Chez Betocool: The wife's a huge fan What can I say, I liked it more than I thought I would. Sounds pristine and it oozes 80's cool. Cheers, Alberto
  14. They haven't released anything since 2014... hope they don't forget us! Cheers, Alberto
  15. betocool

    DIY audio: what are you building?

    Marc, how did you get 200V out of 24V? A special transformer? Cheers, Alberto
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