IDWAE

IDWAE Ian Wynn Audio Engineering
www.iandwynn.co.uk
British Audio Design Engineering
Speaker and Subwoofer modelling
Bespoke Fabricator and Designer

Custom doorcards for a Volkswagen Corado with mk4 Golf dash swap!These were fun to fabricate! A real challenge with so l...
15/05/2022

Custom doorcards for a Volkswagen Corado with mk4 Golf dash swap!

These were fun to fabricate! A real challenge with so little space to work with!

Im really enjoying the space so far... By the ear testing I have some serious issues in the 70-90hz range. I'll be start...
10/08/2021

Im really enjoying the space so far...
By the ear testing I have some serious issues in the 70-90hz range. I'll be starting off with using the onboard DSP on the KRK to try and dial these out, im skeptical starting out, the settings available are interesting curves for sure but I'm not sure they will deal with my issue. I'll be using the DSP8024 later down the line to really get the monitors as flat as possible.

JBL XTI tweeters all finished up
10/08/2021

JBL XTI tweeters all finished up

These JBL A2101A tweeters were dented pretty bad when I got them but with some skill, light pressure and patience I was ...
10/08/2021

These JBL A2101A tweeters were dented pretty bad when I got them but with some skill, light pressure and patience I was able to form them back to 99%. They sound and measure as good as the undamaged ones.

Working on the studio over this winter, its been too dam cold to work in recently! I still have to finish the top which ...
18/01/2021

Working on the studio over this winter, its been too dam cold to work in recently!
I still have to finish the top which I'm really looking forward to make, put a partition wall up, build acoustic panels, paint and decorate... lots to do!!!

Check out the full descripion on www.iandwynn.co.ukGorgeous speaker enclosures for the vintage Jordan Watts Module
29/06/2020

Check out the full descripion on www.iandwynn.co.uk

Gorgeous speaker enclosures for the vintage Jordan Watts Module

Jordan Watts Modules from the Gemini speakers being tested on the Dayton Audio DATS V3Check out the full post onwww.iand...
12/06/2020

Jordan Watts Modules from the Gemini speakers being tested on the Dayton Audio DATS V3
Check out the full post on

www.iandwynn.com

AD/DA Conversions, learning those single cycle processes that take raw audio and convert it to the digital domain make a...
15/02/2020

AD/DA Conversions, learning those single cycle processes that take raw audio and convert it to the digital domain make all the difference in understanding audio at it's most fundamental level

I've got this very well known Astron RS-50A Power supply in for repair and upgrade, so far the tear down is going well b...
30/01/2020

I've got this very well known Astron RS-50A Power supply in for repair and upgrade, so far the tear down is going well but I'm shocked at the terrible build quality of these units!

So far I've found a few issues which need addressing first before any mods or upgrades take place! Output was soaring to 17v+ with very little output current, a few mA perhaps, even an LED bulb drained down the whole supply in seconds I suspected the crowbar circuit has failed as it should not allow the unit to operate at such a high voltage but it seems to be multiple issues.

The main capacitor has one thread destroyed you can see two different fixings used. Its not holding any charge so that will be replaced possibly upgraded to accommodate higher current output at the modification stage of this rebuild

The 2N5038 pass transistors seem fine and all within tolerance apart from really needing cleaned up of really dry thermal paste they are ok and tested fine. Even so I will replace them all for a prolong and problem free extended service life and keep these as spares

The board has some burn marks on pins 5-6 it looks as though it's been shorting on the cap due to not being tight or has had previous failure, first point of call here seeing as the voltage was through the roof was to replace the LM723CN chip to see if that would solve the issue, the chip which handles amongst other things voltage regulation is a very common chip and the circuitry here is simple. It has it's own filter cap which also will need to be checked, I see myself being able to repair this board, all traces seem fine there may just be component issues as opposed to a pcb failure as most commonly found on these units.

When all the new components arrive and are fitted I can check reference voltages around the board aswell as the chip to make sure its within its operating parameters Astron provide these openly and the manuals are very detailed in design and operation aswell as troubleshooting, I guess they envisaged many people repairing them?
once all that's done the total strip down and modifications will commence which is really the part I'm looking forward too

So far plans are improving output current at minimum to the RS70 spec which I believe quickly comparing notes and schematics is a few more pass transistors and another main filter cap to get 50 odd continuous amps, I plan on improving this to its fullest potential as I test sometimes quite large amplifiers.
A small lcd display to monitor voltage and amperage using an ebay special display and shunt, this wont be for total accuracy but more of a guideline to
I'll also be retrofitting voltage control, the PCB has a surface mount calibration wheel from factory to set it to the 13.8v it was intended to supply. So that it can supply current to 12v 14v 16v applications I'll be using a taper track 1W 5k AB Elektronik potentionmeter soldered onto the PCB in situe.

Ultimately I will be using this to switch/co -supply a pack of Yinglong LTO cells and my current bank of XS Power 14v AGM

Something unique to add to the collection!Alpine 4780 Real Time AnalyserIt's in amazing condition and was acquired from ...
08/01/2020

Something unique to add to the collection!
Alpine 4780 Real Time Analyser
It's in amazing condition and was acquired from the very lovely wife of of Norfolk Car Audio owner Mathew Knott. Hes apparently sadly passed now and I'm very glad its come to a good home.

It's a rare-ish item lots seemed to have been sold back in the 90's but theres sadly not much information about them around. No service manual or indication what the adjustment pots are for, Calibration perhaps?

The manual is very basic as are the functions of the unit, but to say it's classic 90's appearance hits on my soft spots! 🥰

I'm definitely going to look into upgrading a few things on it so far my plans are a full internal cleanup and checking for any damaged or hot components, improving the contrast of the LCD, classic soft glow backlight aswell as reversing the paper replacement hinge mechanism so i can display the LCD at an angle, I'm also thinking of an auto reel for the mic lead, replacing the flexible gooseneck and a better mount for it as right now it's basically a large paperclip!

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