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googlyone googlyone is offline

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About Me

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


Total Posts
General Information
  • Last Activity: Yesterday 01:32 AM
  • Join Date: 7th November 2006


View googlyone's BlogRecent Entries
Latest Blog Entry

Posted 6th December 2014 at 05:10 AM by googlyone Comments 0
Posted in Uncategorized
Over the last couple of decades I have built an awful lot of power electronics stuff, especially power amplifiers.

So I have bought and used a commensurately large number of power electronic devices.

As a young hobbyist this started with salvaging bits from refuse - especially in the late 70's and early 80's larger power devices were far from cheap. This generally worked really well, as I never did really trust what I pulled out of refuse gear, and I tested stuff that I used. (also not the least as data on power devices came from "equivelant devices" books such as the "Towers guide" and if you were really lucky you found a datasheet somewhere (on paper!). no intenet....

Why the digression?

Oddly with the advent of the internet and subsequently things like EBAY:
- I could get all sorts of things that you just could not buy locally in small quantities.
- Unscrupulous buggers out there started...

Posted 2nd November 2014 at 05:03 AM by googlyone Comments 0
Posted in Uncategorized
About 6 months ago I finished off a CS4398 (DAC) and PIC32MX450 (microcontroller) based direct Digital Synthesiser.

I recently packaged this into an instrument case, and added a power supply cum interface card that allows this to all neatly plug together. As a final chapter to the development of this synth, I have tried to measure the harmonics it generates and to use it to test an example amplifier.

What does it look like? Not super fancy, but neat enough and laid out pretty reasonably I think:

Attachment 1437

The larger home made board at the back is a power supply - well five of them in fact - to allow clear isolation between a number of digital and analogue rails.

The square board on the base of the case is the PIC board. This runs the human machine interface and more importantly does all the calculation of the waveforms. You can generate any waveform you want, provided it is repetitive and can be...

Posted 6th October 2014 at 11:30 AM by googlyone Comments 3
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 02:18 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

Attachment 1377

Attachment 1378

Attachment 1379

Attachment 1380

Attachment 1381

Attachment 1382

Attachment 1383

The amplifier has:
- A digitiser on its input.

- DSP implementing crossover and...

Posted 24th August 2014 at 09:58 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......
Recent Comments
OK that is hardcore!!...
Posted 4th November 2014 at 07:27 AM by wintermute wintermute is offline
Yes, the repair worked...
Posted 31st October 2014 at 10:56 PM by googlyone googlyone is offline
Nice job googlyone....
Posted 27th October 2014 at 12:14 PM by wintermute wintermute is offline
Originally Posted by mbates14
Is there a way instead
Posted 6th September 2014 at 02:44 PM by googlyone googlyone is offline
Is there a way instead...
Posted 23rd August 2014 at 02:40 AM by mbates14 mbates14 is offline
Hide this!Advertise here!

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