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googlyone googlyone is offline

diyAudio Member

About Me

  • About googlyone
    Biography
    Electronics engineer, worked on digital, RF, systems engineering, software. Now in management :(
    Location
    Adelaide, South Australia
    Interests
    Strong interest in electronics, particularly analog, power audio and DSP. Hands on, try it out type
    Occupation
    Engineer
    Country
    Australia
    Real Name
    Phil

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  • Last Activity: Today 08:55 AM
  • Join Date: 7th November 2006

Blog

View googlyone's BlogRecent Entries
Latest Blog Entry

Posted 6th October 2014 at 10:30 AM by googlyone Comments 0
Posted in Uncategorized
Over the last 6 or so months I have built a nice little sub plus satellite system that comprises:
- The "Ikea Salad Bowl Speakers", with some really nice vifa premium line drivers in them, making these 1980's vintage
- A Richard Allan subwoofer, in which I used a 1970's (I guess) HP12B driver, in a complex cubical enclosure with a corner cut off for the driver, and
- A ridiculously complex amplifier built to drive this lot, with DSP, multiple channels, optimised even to the point of addressing the fact the HP12B is 16 Ohms, and running bridged for that output.

So imagine my reaction when last night I settled back and ran the system up "properly" for maybe the second or third time, and CRACK!!!

My initial thought was that I had over "excursioned" the sub, and the voice coil was hitting the magnet backplate. I dug into the amplifier and programmed a subsonic filter, as you do, and settled back in again. CRACK!...

Posted 26th August 2014 at 01:18 PM by googlyone Comments 0
Posted in Uncategorized
I finally got the retro am finished. At least to the point of all the parts set to work, the case built and assembled and wired up.

The photos really don't show just how orange it is, nor does he slant in the case "pop out" as much as it does in real life.

Attachment 1376

Yes, I did the "writing" on the front panel by hand with a paintbrush.... I came close to getting the thing CNC milled, but concluded that the hand painted approach would be (a) fun, (b) a new challenge, and (c) more in line with a retro amp

Attachment 1375

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Attachment 1379

Attachment 1380

Attachment 1381

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Attachment 1383

The amplifier has:
- A digitiser on its input.

- DSP implementing crossover and...

Posted 24th August 2014 at 08:58 AM by googlyone Comments 0
Posted in Uncategorized
I have been using a pretty crappy "Dick Smith" soldering iron for - well too damn long. I have always been meaning to get a decent iron. Given the fact that it worked, and I have been using it for close on 30 years (if not more) resulted in me investing my time and money in other things.

I recently bought two WSP80 Weller soldering irons off ebay at a killer price.

These ate just the "pencil" part of the soldering iron, and need the power supply / controller. Which are not cheap.

Looking on the net there are a number of schematics of various weller power supply / controllers. But various bits and pieces were not quire right for the WPS80 that I had.

As a start I am using this...
Attachment 1373

This is evidently extremely analogue. Which is quick and easy to design and build, and analogue just warms the cockles of my heart.

The final product is like this......

Posted 13th July 2014 at 02:26 AM by googlyone Comments 1
Posted in Uncategorized
What sort of amplifier do you build to go with a funky retro subwoofer and "Ikea Salad Bowl" speakers?

How do you reconcile this with the fact that you have a "metric shitload" of DSP stuff laying around?

I have run into this problem, and concluded that I need to mash these into something that is not new and higher tech than old style.

This has resulted in me trying to train smash "new and old" into what I am hoping will be a retro styled, but thoroughly high tech-on-the-inside amplifier. (Stopping short of going class - D which I hold aesthetic objections against).

So lets get started with the basics. The amplifier will not be square - it will be a parallelogram...

Attachment 1332

And to follow up with my (albeit young) recollections of the 1970's, it CANNOT be black.

This amplifier needs to be the most acid driven shade of orange that I can find....

Posted 1st June 2014 at 12:20 PM by googlyone Comments 1
Posted in Uncategorized
A while back I built some Ikea bowl speakers using Vifa bassmids and tweeters. The performance came out very good indeed, but when you are dealing with a 5 odd inch driver, there will never be masses of bass.

A subwoofer was always on the cards.

Attachment 1298

Given the spherical speakers perched on the retro "rocket like" stands, I initially thought of doing a spherical subwoofer - but in the end concluded that while I could do this, I was looking at using fibreglass on a "fit-ball", placement in the room was looking to be a challenge.

So I chose to do the absolute opposite - and came up with an off the wall approach to a conventional sub.

Attachment 1296

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The idea was to move the implementation of a conventional sub well away from the "box with a driver stuck on the front".

I find it fascinating that...
Recent Comments
Quote:
Originally Posted by mbates14
Is there a way instead
...
Posted 6th September 2014 at 01:44 PM by googlyone googlyone is offline
Is there a way instead...
Posted 23rd August 2014 at 01:40 AM by mbates14 mbates14 is offline
looking forward to the...
Posted 13th July 2014 at 09:50 PM by wintermute wintermute is offline
Very nice indeed
Posted 21st June 2014 at 01:53 PM by SteB SteB is online now
Quote:
Originally Posted by CharlieLaub
Nice! A little short
...
Posted 21st March 2014 at 11:45 AM by googlyone googlyone is offline
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