There can be a problem with modifying Double insulated (ClassII) equipment.
The equipment is supplied guaranteed to be safe after a design, build and test procedure.
That guarantee becomes void if you make any modification.
You are on your own regarding culpability if or when an incident occurs.
I seem to remember reading that one is not allowed to alter ClassII equipment because of the voiding of "guaranteed to be safe".
The equipment is supplied guaranteed to be safe after a design, build and test procedure.
That guarantee becomes void if you make any modification.
You are on your own regarding culpability if or when an incident occurs.
I seem to remember reading that one is not allowed to alter ClassII equipment because of the voiding of "guaranteed to be safe".
My take on the Ruby
Hey there folks.. I recently built a simple Ruby Amp. Following the schematic at runoffgroove.com I had a lot of fun designing and etching the enclosure / making legs etc.. Fun little practice amp.
Hey there folks.. I recently built a simple Ruby Amp. Following the schematic at runoffgroove.com I had a lot of fun designing and etching the enclosure / making legs etc.. Fun little practice amp.
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That's a nice, compact, well executed build. Can you provide more details on how the enclosure etching was done?
Sure thing farley... and thanks for the kind words.. I wish I could take credit for coming up with the method. I tried lots of things but settled on using PCB etching solution (ferric chloride) with a bit of copper, and citric acid added. This creates a pretty volatile solution and gets the job done in minutes compared to hours when just using ferric chloride. I picked up this tip over at MylkStuff... Jody is an amazing builder and has a beautiful execution and attention to detail. I have learned a lot from his process..
1) So in general you create a mask, I have a vinyl cutter so I can do some pretty detailed stuff. You could do this with a laser printer transfer as well using magazine paper, or gloss paper. Then you just expose the aluminum of the enclosure to the solution and it will eat away at it.. I usually end up cleaning it lightly with a tooth brush and water a few times to get rid of the crud building up on the surface.
2) Next you remove the mask and paint the entire surface of the enclosure with what ever color paint.. lay it on thick as hell.. let it dry pretty good and then hit it with a sanding block and water.. Just wet sand it down to the metal again. If you have a light touch and watch yourself you can get that nice buildup on the edges like the skull on my amp. I really dig that look.
3) Just dry the surface and polish..
here is a link to a video with an in depth description of that etching process https://www.youtube.com/watch?v=rG2RAs2sbbI it's a funny video.. dude has a classic delivery of the info..
and lastly here is a little sound demo of my ruby amp. iPhone recording so take it for what it is.. https://www.youtube.com/watch?v=7il7SlevvIE
Power amplifier with DAC
Hello everybody.
These are some pics of my freshly built power amplifier with analog and digital inputs.
It is based on the following components:
Digital receiver - CS8416
DAC - PCM5122
Input selection - 2 x DG408
Balanced receiver - INA2137
Volume control - PGA2310
Power amp - 2 x TDA7294
Microcontroller - PIC16f1934
Case - HI-FI 2000 pesante dissipante (modu)
Inputs (stereo):
1 x Balanced (XLR)
3 x Unbalanced (RCA)
2 x S/PDIF
2 x Toslink
1 x AES/EBU
Hello everybody.
These are some pics of my freshly built power amplifier with analog and digital inputs.
It is based on the following components:
Digital receiver - CS8416
DAC - PCM5122
Input selection - 2 x DG408
Balanced receiver - INA2137
Volume control - PGA2310
Power amp - 2 x TDA7294
Microcontroller - PIC16f1934
Case - HI-FI 2000 pesante dissipante (modu)
Inputs (stereo):
1 x Balanced (XLR)
3 x Unbalanced (RCA)
2 x S/PDIF
2 x Toslink
1 x AES/EBU
Attachments
Wait, but where's the input? I assume it's a headphone amp with the jack, but how does music get INTO that little box? Am I missing something obvious? The "rear" panel has no jacks...
Hey Carlp... It is a guitar amp.. so there is only a simple 1/4 inch jack for the input, your standard instrument cable. It's not really designed as a headphone amp, although it could easily be turned into that by adding a mono jack before the speaker. This particular amp just has a 2.5 inch 2watt, 8ohm mylar speaker and is for bedroom level jamming, or practice with guitar. I am sure it could play music as well, but I would imagine there is too much gain involved for such a use, and it would distort. Hope that answers your question.
2x 15W LM3886 in attempt to make box from scraps. cooler for both chips is 2mm aluminium on top of not so good quality but it dont go over 40 degrees celsius after few hours of listening just before clip.
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Ah, that was a thought of mine. That the bottom panel included a speaker. And now that I think of it, the Ruby IS a guitar amp. That clarifies things perfectly, thanks. Wish there were such a thing possible for a bass as that's what I play.
funny you mention bass.. I have been working on a mod for a bass practice amp in this format. I will let you know if I am successful and will share the specs.. I am sure it won't be too bottom heavy but the goal will be to keep a clean signal and up the values on the caps to add more bass to the circuit. Speaker choice will be crucial as well..
Rough old box for LM3886 amp
Hi, been reading the forum får a while and this is my first post.
Thanks for all the inspiration and awesome stuff!
I Started my build around 8 years ago. But it didn't get finished. As it some times get.
The first one was hard wired. Thats the way to go back then with gainclones.
This time around i ordered X Y boards for LM3886.
I found a nice old electronics case. Its a old AC to DC converter. Like the rough style.
This is my so far markup.
What u think?
Hi, been reading the forum får a while and this is my first post.
Thanks for all the inspiration and awesome stuff!
I Started my build around 8 years ago. But it didn't get finished. As it some times get.
The first one was hard wired. Thats the way to go back then with gainclones.
This time around i ordered X Y boards for LM3886.
I found a nice old electronics case. Its a old AC to DC converter. Like the rough style.
This is my so far markup.
What u think?
Attachments
Not been hotter than 40 degrees celcius. But I'm still going to take some extra measures.
Sent from my Nexus 6P using Tapatalk
Sent from my Nexus 6P using Tapatalk
I think you are like myself in that you like to use old enclosures. A recycling type of a DIYer.
@myroslav and bas : I like very much what you have created. 🙂