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LM3875-Gainclone-Protoboard.jpgDIY LM3875 Gainclone on Protoboard8143 viewsAnother view of the LM3875 Gainclone on a Protoboard. The schematic is the same as Mark's DIY LM3875 Gainclone project. All of the parts (except the chip) are from Dick Smith and can also be found at Radio Shack in the US.
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DIY-Fostex-FX120-Transmission-Line-Speaker.jpgDIY Fostex FX120 Transmission Line Speaker8117 viewsHere the Fostex FX120 fullrange driver is used in a DIY Transmission Line Speaker Enclosure. Fore more information, see the DIY Fostex FX120 Transmission Line Speaker Project.
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Open-Baffle-Speaker-Fostex-FE206E-Eminence-Side.jpgFostex FE206E / Eminence Open Baffle Speakers - Side8117 viewsSide view of Keith's Fostex FE206E fullrange and Eminence speakers in an open baffle.
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Lowther_DX3_Open_Baffle_Speaker.jpgLowther DX3 Open Baffle Speakers8101 viewsBaffle height: 56", Baffle width: 25", 20 mm marine plywood
Baffle sloped 10° to the rear to time-align the drivers.
Fane POP100 18": centre 13" from floor.
Lowther DX3 8": 34" from floor, offset 3" from centre line.
Tweeter 2": upward firing from the top of the baffle.
Acoustic shelf: 26" from floor, 9" wide and 6" deep, centre aligned with the Lowther.
Bass box sides: 10" deep at the bottom, 5" deep at top, 26" height.
Bass port shelf: fitted across the centre of the bass speaker.
Crossover:
6dB per octave
Bass turn-over frequency 120 Hz
Lowther roll-off frequency 240 Hz (high frequencies not rolled off)
Tweeter roll-off frequency 6,000 Hz 12dB per octave
The sound has the typical Lowther wide open mid-range, quick and revealing, even with an old, low powered solid state amp. Usually Lowthers are expected to be in horns, but on a big open baffle, they just fill the room and work just as well.
electric triode (Australia)
www.amplifiers.com.au
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Happy_Feet.jpgDIY Loudspeaker Feet8063 viewsThis is a photo of my loudspeaker feet project. For instructions on how to build the loudspeaker feet, see the DIY Loudspeaker Feet Instructions in PDF.
Much regards,
Guus Das.
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3.jpgDIY Guitar Amplifier 7980 viewsA photograph of the finished DIY Guitar Amplifier. The simple graphics on the faceplate are custom made and a fender speaker cover is used. The amplifier is a K-16LM 16W Mono Tube Amp Kit.
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Scanspeak-8531-D3004-6600-00-T-Line.jpgScanSpeak Revelator 8531 MidBass / D3004-6600-00 Tweeter in Transmission Line Enclosure7942 viewsScanSpeak 8531 mid-bass and Scanspeak RevelatorD3004-6600-00 Aircirc tweeters in a transmission line housing, with the tweeter in separate decoupled enclosure. The cross-over is suspended externally underneath the main housing.
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Diaphony2.jpg"Diaphony's" An open baffle design7925 viewsConstruction with waive guide prior to final rough finish.
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K-502-Tube-Amplifier-Kit.jpgK-502 Tube Amplifier Kit7873 viewsBarry's wood and Plexiglas enclosure for the K-502 Tube Amplifier Kit.
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Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpgCopper Steampunk K-12G Tube Amp Kit - Rear7854 viewsThis is a K-12G tube amplifier kit that I built into a steampunk-ish enclosure. Had a blast with this one, and I'm amazed at the amount of wonderful sound that this little tube amp kit puts out!
I'll be posting construction photos on my blog site if you're interested in taking a look: www.coppersteam.com
Mike Cochran
Key West, USA
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DIY-Class-A-Mosfet-Amp.jpgDIY-Class-A-Mosfet-Amp7824 viewsThe fellows over at the Russian audio community datagor.ru have now built a small handful of Mark's simple DIY Class A Mosfet Amplifier project. See the schematic for more details about this build..
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Fostex-FE127E-DIY-Bookshelf-Speakers.jpgFostex FE127E DIY Bookshelf Speakers7753 viewsDIY Bookshelf Speakers using the Fostex FE127E fullrange speaker driver.
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Dallas-Back-Loaded-Horn-Speaker-Fostex-FE206E.jpgDallas Back Loaded Horn Foxtex FE206E Speakers7747 viewsPair of Back (rear) Loaded Horn Speakers using the Fostex FE206E driver. The drivers are modified with a custom DIY phase plug. The enclosure design is the Dallas by Ron Clarke. The cabinets were built by Keith.
For more information, see the Dallas Back (Rear) Loaded Horn Speakers with Foxtex FE206E thread on the forum.
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DIY_Loudspeaker_Feet.pdfDIY Loudspeaker Feet Instructions7744 viewsHere are DIY instructions to construct feet for returning loudspeakers to the exact same position. Here is a link to a photograph of the finished DIY Loudspeaker Feet.
Much regards,
Guus Das.
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DSCF1666~0.JPGTransmission Line for Jordan JX9257738 viewsThe Jordan JX92S fullrange drivers look great in this beautifully made transmission line enclosure. Pat from the Melbourne Audio Club drives them with either a pair of valve monoblocks or other SS amps he owns. These including a Sony vintage VFET power amp preamp combo.
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Workshop_Heater.JPG2nd DIY OTL monoblock being built7701 viewsFreezing cold in the workshop , it was a pleasure to be right next to the first monoblock that was pre heating and breaking in the output stage.
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PreampComp.jpgMelbourne Audio Club - Preamp Comparison Night7698 viewsAt the May GM of the Club we did a blind A/B comparison between my 12AX7 Tube Preamp and OP Amp Preamp while the rest of the gear remained unchanged. No member knew whether he was listing to the valve or chip preamp, just A or B. Two similar tracks was played from a wide range of music styles the first track on one preamp and the second track on the other. The members voted 60/40 in favor of the chip preamp.
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TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier7646 viewsAnother excellent looking build by vortchun. This DIY amplifier is built around the TDA2030 which will put out a maximum of 14W. The wooden enclosure matches the previously completed Voight Pipe Speakers Visaton BG 17 driver project.
For full details of this TDA2030 chip amplifier build, see the TDA2030 DIY Amplifier thread on the discussion forum.
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Realistic-Minimus77-Speakers-AlMg-Driver.jpgHiVi BN4 Anodised Aluminium / Magnesium Midbass Drivers7641 viewsThe drivers in these metal enclosure Tandy / Realistic / Radio Shack Minimus 77 speakers, had been burnt out when a chip amp decided to deliver pure DC. So I upgraded the drivers to these metal cone varieties. The magnets (neodymium) are big partly due to the shielding which is done with magnetic repulsion. The cones are ultra-light and very rigid and the surrounds compliant. Power rating is 25WRMS and under listening tests, in the enclosures, go down to 100hz. The over-all sound is bright (see other image). The crossover is 1st order and additional dampening was added to the box.
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DIY-2SK1058-Class-A-Amp-Day.JPGSingle Ended Class-A Amplifier using 2SK1058 Mosfet7609 viewsOutside view of Sergiy's amplifier build. For more information, see the DIY Class-A Single-Ended 2SK1058 Mosfet Amplifier Project page.
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