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DIY audio: what are you building?


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2 hours ago, aussievintage said:

 

You called it a K495, but even looking for K465, that kit does not appear on their web site.

Oops yes I stuffed up. Should be soon. I’ll try to get a date. 

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1 hour ago, aussievintage said:

Geez, they change designs like I change  underpants.

 

You mean every couple of months?  :P

 

Andy

 

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5 hours ago, keinesorge said:

Hi Alberto,

 

Its looking nice.

 

LM4562 ?

No, just the 5532. I'll try a 7809 and 7909 as power supplies, with massive caps before. We'll see how that turns out. More updates to come.

 

Cheers,

 

Alberto

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4 minutes ago, betocool said:

No, just the 5532. I'll try a 7809 and 7909 as power supplies, with massive caps before. We'll see how that turns out. More updates to come.

 

Cheers,

 

Alberto

To me the 4562 is a more precise version of the 5532 / 5534.  Very enjoyable.  My current setup has no dip8 components in an output stage but when it did the LM4562 was the flavour of the month by a comfortable margin.

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Let’s face it, good on Oatley for bringing out new and interesting cheap kits. Keeps us DIYers interested. And for me more bloody work. Lol. I just godda have a go with my own twist of course. 

Edited by mwhouston
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21 hours ago, keinesorge said:

To me the 4562 is a more precise version of the 5532 / 5534.  Very enjoyable.  My current setup has no dip8 components in an output stage but when it did the LM4562 was the flavour of the month by a comfortable margin.

I wasn't familiar with the 4562. I shall give it a try sometime in the future. I've built a few CMOY based op-amp headphone amps (in a metal cigar box and other boxes) and somehow I preferred the 5532 over the 2134. Can't tell you exactly what it was, but I just did. Mental bias I guess?

 

Cheers,

 

Alberto

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3 minutes ago, betocool said:

I wasn't familiar with the 4562. I shall give it a try sometime in the future. I've built a few CMOY based op-amp headphone amps (in a metal cigar box and other boxes) and somehow I preferred the 5532 over the 2134. Can't tell you exactly what it was, but I just did. Mental bias I guess?

 

Cheers,

 

Alberto

Hi Alberto,

 

I'm with you on that one.  I also prefer the 5532 over the 2134.  It seems to have more of a "genuine old school sound" to it (not overly etched) which i do enjoy.  I dont recall too much of the 2134 as i got rid of mine after a giving it a couple of days.

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Completed. All went together well. Getting the parts off the brd to make what is in the image was harder than putting it together. Al screening top and bottom connected to zero volts. Two lithium’s for +/- 9V. Sounds good worked at first on.


Listening to an Opera LP. 

 

7B6C0C21-48EA-4424-9523-E57D0A6BC100.jpeg

6FF04063-0330-45DA-BAD2-21722813A91E.jpeg

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Would you believe after one day of use the switch won’t latch. It’s become a momentary over night. I have no other and for now shorted it,. I employ what I call “safe on” which means if the is no jack in the input then no power goes to the unit. To turn it off I just pull the I out jack. Bloody nuisance though.   

2D1C2D4B-5B42-4A24-82C6-933C81191596.jpeg

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Lenco PTP project making progress. On the way to an all DIY component system :D 


Loricraft inspired plinth design.

 

Hardwood plinth, two layers of birch ply for the inner plinth, hammertone finish on the PTP4, and an ebony Tonearm board. 
 

FA3BB834-16C3-4758-8B68-5DE4788604A0.thumb.jpeg.8e840996e721a7d58320e40f29b8e9fb.jpeg18E2C3B7-FBD8-4709-A279-CFB460BBD56E.thumb.jpeg.e3ef2e2a0db243174e5d66abb5bce772.jpeg5CB0EDE9-E716-4055-928A-CB9B7D57BA16.thumb.jpeg.0ba08ffa488ae3d963e4febb889c8a63.jpeg

Waiting on parts for the tonearm... so I might have a gander at the Lenco parts and look at what cleaning they need in the meantime. 

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Needed multi input for my Topping L30 so i’m making a input selector in a metal chassis. Hope this Eizz switch is good. had purchased a few crap no name ones on ebay in the past.

 

decided to completely switch signal and ground with a 4 channel switch

 

 

Built into an old chassis, reused rca connectors, old milspec

silver plated 18ga. wire, only thing i had to buy was a pair of neutrik RCA chassis mounts as the chassis had XLR holes drilled already.

C4F899DA-3CB8-4DC8-AB52-9C0E2194838C.jpeg

0CED9961-634B-44D5-BE81-A251A9B37762.jpeg

0A578049-9A15-4C1A-8F13-EC230919E961.jpeg

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Si, I had a play with this stuff the last couple of days and had to tweak things around to get things to work properly.

 

First I built a case out of wood, lined up inside with aluminium foil. As to whether alu is better or worse than copper for shielding, that's a discussion for another day. But I've had always excellent results with alu-foil in guitars and other related projects. To get it flush against the wood, I mixed school glue and water at a 50% ratio for both, applied with a cloth on the wood and spread the foil with a dry rag. I get very consistent results like that.

 

IMG20200906103548.thumb.jpg.b2ef6437f1b0f6114b022291581e89d1.jpg

 

Then I put the electronics in, the front, and took it for another spin.

 

IMG20200906113425.thumb.jpg.89496b900a94da637df630b912c21e7b.jpg

IMG20200906113630.thumb.jpg.4df0be2676087cff6281fbc46276086d.jpg

 

I went for the 7809/7909 linear reg power supply and small transformer I had around. Power and audio are separate, because I figured I don't want any of the transformer or high voltage emissions to get even close to the gain circuit. Even so, the first tests were very disappointing, in the sense that I got a lot of noise going into the amp.

 

IMG20200906122704.thumb.jpg.d44bbf7d66e7a383f2113a4f5650dcbc.jpg

 

The shield is connected to the earth. The first iteration, the circuit GND was connected through a cap (10nf) and a resistor (1M) to shield. You could hear a fair bit of noise at higher volumes. Removing that cap and resistor proved even worse. The chassis connection to the phono stage was always connected. Removing the phono chassis connection was also bad.

 

I stepped back for a sec, took a breather, and decided to connect the signal input GND at the RCA terminals directly to the chassis (ie, earth). And that did it. All noise and buzzes went away, to the point where the noise levels are similar to the amp's internal phono stage. And that's how I decided to leave it.

 

Weekend past I worked on painting and coating the front of the unit, and this weekend I sanded and buffed the front. I did not bother with the enclosure. I could have done a better job, and I should have, but I'm still happy how it turned out.

 

IMG20200912163514.thumb.jpg.d11d57d3ad86f8195e413b9d00a49b3d.jpg

 

IMG20200912171736.thumb.jpg.e061647696650a9c97ee9b168d45210d.jpg

 

Yeah, ok, it looks a but scuffed, but I can live with that!

 

Yesterday afternoon was spent with Dark Side of the Moon after listening to Hans Zimmer's Dune/Eclipse, some Dire Straits, and some Queen Greatest Hits II, and all of them shine. The "critical" listening quickly turned into "just" listening. Happy with the results!

 

Cheers,

 

Alberto

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5 minutes ago, betocool said:

First I built a case out of wood, lined up inside with aluminium foil

This sounds like a great idea - will have to try it on one of my current projects.

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40 minutes ago, betocool said:

Si, I had a play with this stuff the last couple of days and had to tweak things around to get things to work properly.

 

First I built a case out of wood, lined up inside with aluminium foil. As to whether alu is better or worse than copper for shielding, that's a discussion for another day. But I've had always excellent results with alu-foil in guitars and other related projects. To get it flush against the wood, I mixed school glue and water at a 50% ratio for both, applied with a cloth on the wood and spread the foil with a dry rag. I get very consistent results like that.

 

IMG20200906103548.thumb.jpg.b2ef6437f1b0f6114b022291581e89d1.jpg

 

Then I put the electronics in, the front, and took it for another spin.

 

IMG20200906113425.thumb.jpg.89496b900a94da637df630b912c21e7b.jpg

IMG20200906113630.thumb.jpg.4df0be2676087cff6281fbc46276086d.jpg

 

I went for the 7809/7909 linear reg power supply and small transformer I had around. Power and audio are separate, because I figured I don't want any of the transformer or high voltage emissions to get even close to the gain circuit. Even so, the first tests were very disappointing, in the sense that I got a lot of noise going into the amp.

 

IMG20200906122704.thumb.jpg.d44bbf7d66e7a383f2113a4f5650dcbc.jpg

 

The shield is connected to the earth. The first iteration, the circuit GND was connected through a cap (10nf) and a resistor (1M) to shield. You could hear a fair bit of noise at higher volumes. Removing that cap and resistor proved even worse. The chassis connection to the phono stage was always connected. Removing the phono chassis connection was also bad.

 

I stepped back for a sec, took a breather, and decided to connect the signal input GND at the RCA terminals directly to the chassis (ie, earth). And that did it. All noise and buzzes went away, to the point where the noise levels are similar to the amp's internal phono stage. And that's how I decided to leave it.

 

Weekend past I worked on painting and coating the front of the unit, and this weekend I sanded and buffed the front. I did not bother with the enclosure. I could have done a better job, and I should have, but I'm still happy how it turned out.

 

IMG20200912163514.thumb.jpg.d11d57d3ad86f8195e413b9d00a49b3d.jpg

 

IMG20200912171736.thumb.jpg.e061647696650a9c97ee9b168d45210d.jpg

 

Yeah, ok, it looks a but scuffed, but I can live with that!

 

Yesterday afternoon was spent with Dark Side of the Moon after listening to Hans Zimmer's Dune/Eclipse, some Dire Straits, and some Queen Greatest Hits II, and all of them shine. The "critical" listening quickly turned into "just" listening. Happy with the results!

 

Cheers,

 

Alberto

Good work.

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