re sy fotios .... skip the diy for a few hours ... its easter time ... good oldfashioned arnaki is waiting for you in afew days ...
gongrats on your project ... com to think about it only a few from you the Dirty Harry and now the pro .... still i belive that are simply one of the best i ve seen together with support and documentation
best regards my friend ... diy audio at its best ...yet again proud to be a member .....
gongrats on your project ... com to think about it only a few from you the Dirty Harry and now the pro .... still i belive that are simply one of the best i ve seen together with support and documentation
best regards my friend ... diy audio at its best ...yet again proud to be a member .....
Hi Sakis
Thanks friend for your kind words and above all for your wishes
. We are faced with a "mountain" of problems (all people knows) but the EASTER is "EASTER" here in Greece. These HOLY DAYS are unique for us, so we forget everything else. Well Sakis, happy easter and "Kali Anastasi" to you and to your family. Give "φιλακια" (= kisses) from me to your baby (is son or daughter?) and to your wife Maria.
Fotis
Hmmm... So, is a custom made motorized encoder machined in a CNC milling machine. However, is a masterpiece of mechanical process. I like it very much, especially the ball bearing base
I had in my mind a different approach (based on my preference of the absolute isolation of the analog and digital part) which i will realize when i will have money left over
BTW, the frame of my MTB (a 12 years old "GT Pantera") is made from 6061 aluminum tubes, is this alloy good?
Happy Easter to all
@fotios
Thanks for your complements, I knew there are still some fellows out there who appreciate the mechanical part of this operation. The initial design of the HPA 1.0 by gmarsh had a pot in it. However the pot was used with an AD input on the MCU to control the digital attenuation in the audio DA chip. So I had to modify the code quite a bit for the encoder to work with it. Before I went ahead and had the machining work done, I had considered using an ALPS motor assembly, but it was just to big to fit the case.
Yes, not only I went for custom made volume control but what about custom made 4 layer boards, custom front and rear panels with custom anodize and laser job, custom AR glass coating ?
Soja, please don't ask how much I spend on this as it may not seem justifiable and could be considered a money pit but owning a decent performing and looking unit is priceless to me.
If you ever follow up on the 'Gold Point' thing you have in mind, you may want to check out Mil-Max spring loaded gold contacts. Perhaps design a small gold plated PCB with round pads arranged in an arc...
Well, I am not an alloy expert so it depends on the application. 6061 is a very common alloy with universal application. I preferred the 7075 alloy over the 6061 as it machines better. 6061 is 'soft' when compared with 7075 if I am not mistaken.
Your volume controller looks very nice too. Altho if I may suggest, you may want to calibrate to dB instead of percent. I see you prefer through hole components over the SMD stuff. I like TH as it solders easier and simplifies routing, unfortunately I had not such luxury with my project.
Here are some display options my amp cycles through before showing the VU meter bar graph.
Cheers
@ kct
I saw your photo gallery. Very nice work, I like very much compact designs and so i can perceive the reason you don't use ALPS analog volume control.
Your ideas are very good. I have to admit that same ideas have passed many times from my mind. I like the... extreme diy. You could see, for example, that the double sided PCBs of my control unit are home made (for this reason the thru holes). I have some tools in home - like a mitre saw and a hand operated milling table - so most times i make the aluminum cases of my projects by alone .
Being busy - and tired - with pro audio equipments for more than 20 years, i know very well the usefulness of dB unit in adjusting the signal level on mixing desks, electronic x-overs, compressor/limiters etc. For home use, i consider dBs unnecessary because the acoustic power of Hi-Fi speakers is relatively small (usually 110dB SPL max compared to the 130-135 dB SPL max obtained from many PA speakers). So, I consider sufficient the volume expression in percentage.
Fotis
I saw your photo gallery. Very nice work, I like very much compact designs and so i can perceive the reason you don't use ALPS analog volume control.
Your ideas are very good. I have to admit that same ideas have passed many times from my mind. I like the... extreme diy
. You could see, for example, that the double sided PCBs of my control unit are home made (for this reason the thru holes). I have some tools in home - like a mitre saw and a hand operated milling table - so most times i make the aluminum cases of my projects by alone . Being busy - and tired - with pro audio equipments for more than 20 years, i know very well the usefulness of dB unit in adjusting the signal level on mixing desks, electronic x-overs, compressor/limiters etc. For home use, i consider dBs unnecessary because the acoustic power of Hi-Fi speakers is relatively small (usually 110dB SPL max compared to the 130-135 dB SPL max obtained from many PA speakers). So, I consider sufficient the volume expression in percentage.
Fotis
Fresh stuff!
Here are some pics from the last work that we did with Lineup. The very polite and kind Lineup helped me a lot in the design of this Preamplifier. Thanks to the extensive use of simulator, we have obtained a really good result. For details of circuitry and measurements, please look at http://www.diyaudio.com/forums/analog-line-level/184455-preamplifier-lineup-fotios-fun.html
and at http://www.diyaudio.com/forums/analogue-source/183545-phono-preamplifier-lineup-fotios.html. In general, it is an Active Preamplifier included in the same case with a Phono Stage, both implemented with discrete devices and high quality parts. It offers 4 inputs: PHONO - CD - DVD - LINE. Its gain is unit (Av = 1) and offers both Single and Balanced outputs. A Record Output is also included, and thanks to the use of robust transistors in the output of main buffer (either MJE172-182 or BD139-140 mounted on heatsinks) the Preamplifier has the ability to drive low loads like a pair of headphones. It is remotely / manually controlled by my Control Unit described previously.
Here are some pics from the last work that we did with Lineup. The very polite and kind Lineup helped me a lot in the design of this Preamplifier. Thanks to the extensive use of simulator, we have obtained a really good result. For details of circuitry and measurements, please look at http://www.diyaudio.com/forums/analog-line-level/184455-preamplifier-lineup-fotios-fun.html
and at http://www.diyaudio.com/forums/analogue-source/183545-phono-preamplifier-lineup-fotios.html. In general, it is an Active Preamplifier included in the same case with a Phono Stage, both implemented with discrete devices and high quality parts. It offers 4 inputs: PHONO - CD - DVD - LINE. Its gain is unit (Av = 1) and offers both Single and Balanced outputs. A Record Output is also included, and thanks to the use of robust transistors in the output of main buffer (either MJE172-182 or BD139-140 mounted on heatsinks) the Preamplifier has the ability to drive low loads like a pair of headphones. It is remotely / manually controlled by my Control Unit described previously.
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@fotios
You have great skill, the unit you build looks very professional. I checkout the other thread, this is beautiful stuff you doing there. Makes me want to do something like that too... You do have a great advantage of working in the audio industry.
@apexaudio
You also have put together a nice Amplifier.
DIYAUDIO forever
You have great skill, the unit you build looks very professional. I checkout the other thread, this is beautiful stuff you doing there. Makes me want to do something like that too... You do have a great advantage of working in the audio industry.
@apexaudio
You also have put together a nice Amplifier.
DIYAUDIO forever
@fotios
You have great skill, the unit you build looks very professional. I checkout the other thread, this is beautiful stuff you doing there. Makes me want to do something like that too... You do have a great advantage of working in the audio industry.
@apexaudio
You also have put together a nice Amplifier.
DIYAUDIO forever
I only share pictures of my projects build by other diyers, I just have no time for hobby :-(
This is '100W Ultimate Fidelity' made by 'LuigiDJ'
Regards
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Out of toppic, but interesting
@ TheShaman and PauloPT
Yes, exactly, we need and an Irish (and who knows whom else in the near future) to establish the club "BANKRUPT".
Sorry guys, but this is not so funny.
Being a worker from my 15 (by doing my studies at the same time, i had no other way), now in my 52 looking back i can see that: When I was 25 I had a few tools, some measuring instruments and some parts, but I had the possibility to earn enough money. Now at my 52 i have lot of tools, lot of instruments and parts but i earn my daily bread with big difficulty and there is no money left over for hobbies and fun.
Personally, I was always self-employed.
IMHO the borrowed money are a very bad thing. Borrowed money are against your independence and your freedom. You should make expenses according to your economic possibility, which means according to your ability of making money from your WORK - with the literal sense of this easily misinterpreted in our times - word.
By an ironic way, this issue is directly related to "DO IT YOURSELF" which is the flag of this forum.
Fotios
@ TheShaman and PauloPT
Yes, exactly, we need and an Irish (and who knows whom else in the near future) to establish the club "BANKRUPT".
Sorry guys, but this is not so funny.
Being a worker from my 15 (by doing my studies at the same time, i had no other way), now in my 52 looking back i can see that: When I was 25 I had a few tools, some measuring instruments and some parts, but I had the possibility to earn enough money. Now at my 52 i have lot of tools, lot of instruments and parts but i earn my daily bread with big difficulty and there is no money left over for hobbies and fun.
Personally, I was always self-employed.
IMHO the borrowed money are a very bad thing. Borrowed money are against your independence and your freedom. You should make expenses according to your economic possibility, which means according to your ability of making money from your WORK - with the literal sense of this easily misinterpreted in our times - word.
By an ironic way, this issue is directly related to "DO IT YOURSELF" which is the flag of this forum.
Fotios
I have always been a believer of "live within your means".
For me that is the equivalent of don't borrow.
My first house was paid for in just under ten years.
I have never had any debt to anyone since then.
Credit is too easy. It tempts the thoughtless and/or extravagant to spend foolishly and end up beyond their means.
What I cannot understand is that the Authorities claim they did not see this coming! Ten or twenty years ago they should have put in place regulations to prevent this mayhem happening.
For me that is the equivalent of don't borrow.
My first house was paid for in just under ten years.
I have never had any debt to anyone since then.
Credit is too easy. It tempts the thoughtless and/or extravagant to spend foolishly and end up beyond their means.
What I cannot understand is that the Authorities claim they did not see this coming! Ten or twenty years ago they should have put in place regulations to prevent this mayhem happening.
