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Some Recent Projects



Multi Function Timer

Multi Function Timer.

This was put together for my nephew who is doing his PhD at Sydney Uni.
He needed an accurate timer with settable (and repeatable) ON and OFF times to control the operation of a solenoid that is in part of an experiment he is conducting.
It can be configured for pulse or single shot operation as well as variable ON/OFF periods.

Rally Start Clock

Rally Start Clock.

These were designed and made for Northern Districts Sporting Car Club (QLD)
The clocks have the following features - 12V operation with rechargeable backup batteries, auto display dimming at night, low power consumption (200mA), easy set up to Master Clock to name but a few.
To see some more pictures, please click the Image.

Mantle Clock

Mantle Clock.

This was a different project, well removed from Audio/Electronics (unless you count chimes as audio!!)
The wood is NSW Redwood, it was really beautiful wood to work with and at $5,000 a cubic metre, not the cheapest. The clock movement is made by Hermle (German) and is a Triple Chime Mechanical Movement, (all in brass). After fine sanding I finished the clock with "Orange Tounge Oil" which protects the wood and is an all natural product and leaves the clock with a satin (silky smooth) finish.
To see some more pictures, please click the Image.

Sub Woofer

Active Sub Woofer Speaker.

This project has been hanging around for some time. The customer is not in a hurry, I had completed the design and initial testing some time ago, it was time to finish this project off! The customer was after a "filler sub" to bide him over for a couple of years till he goes for his "killer surround system " (by Red Adder). I decided on an active sub (175Wrms amp and dual 200mm woofers). The speaker box design came out at 40 litres net, with tuning freq at 54Hz.
To see some more pictures, please click the Image.

Book Shelf Speakers

Book Shelf Satellite Speakers.

An elderly customer had problems with the audio provided by their new LCD TV (poor inbuilt speakers). The speech sounded "garbled" at higher volumes which resulted in unpleasant listening experience. The solution was a small stereo amp and these small bookshelf speakers. These were designed and built to provide clear audio and ±3dB frequency response from 40Hz to 16kHz. A vast improvement in sound quality resulted. I finished the boxes in high gloss black to match the TV.
"Now we can enjoy our shows!" customer reports.
To see some more pictures, please click the Image.

5 Channel Amplifier

5 Channel Amplifier.

This is my new 5 Channel Amplifier, this was not a cheap project but I am really pleased with the outcome. It was 2 years (maybe 3...) in the making. It's specs turned out at 290Wrms per channel (4ohm load),
THD typically 0.006% at 0dB,
I/P sensitivity 800mVrms, I/P Z = 12Kohm,
Freq response 3Hz to 140KHz, -3dB @ rated output,
SNR better than -100dB.
I added clipping detectors for each channel at -3dB and 0dB points.
It also has turn on delay, speaker overload & DC protection and thermal protection.
To see some more pictures, please click the Image.

Power Supply Unit

Power Supply.

This is the power supply unit that provides the umph for the amp. It's main featurers are massive 1500VI torroid transformer, soft start circuit to limit the inrush current on start up, a total of 100,000uF filtering capacitors, ancillary power for speaker protection and clipping indication circuits.
To see some more pictures, please click the Image.

Intercom Unit

Intercom.

This project arose because most of the Intercoms available for noisy environments (eg Rally Car) are expensive and I've found from experience, don't work too well. I've repaired a few of the commercial units and they are your basic transistor amplifier (and I mean basic). My Intercom has several extra audio inputs (for 2way radio/mobile phone use) and audio out (for recording with incar video, etc), I also had speech filters fitted that are switchable, but it was so clear with them on, I'll just make them standard. We trialled the system using throat microphones and were really impressed. We tested this prototype at the recent Bitumin rally at Townsville and both myself and Gary (driver) were impressed with clear communication and virtually no background noise. A great improvement over the commercial unit we had been using.
To see some more pictures, please click the Image.

Book Shelf Speakers

Bookshelf Speakers

This was a small set of bookshelf speakers. The customer had purchased 2 small (120mm) Fostex full range speakers at a bargain price from the internet and asked me to design a small set of ported enclosures for them. He had the rough dimensions he needed and because he was interstate I had to rely on the manufacturers specs to design the boxes. The customer didn't want any finish as he was going to paint them. He was very happy with the sound and is now talking of a little subwoofer to help with the bottom end.
To see some more pictures, please click the Image.


This page will change from time to time as projects come and go, please check out the Gallery Page for more photos.


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Red Adder Audio Technology