Sorry that should have read "5 or 12 volt" for the relays. It depends on which transfo you use. And there are two of each. I have corrected the post.
soulfuel: I do get a slight pop (click) at start up but not a buzz. The pop is the Mute relay switching over. As the mute relay switches at start-up and is grounding the amp I think the buzz is a ground loop.
For me I have a single ground to protective earth connection on my power supply PCB.
I don't think the multiple ground returns on each of the three Power connectors is a good arrangement but that will depend on your PSU / regulator arrangement upstream.
I have not done it yet but I do intend to use the Arduino to remote power-up/down the power amp. This will be simple with a opto-isolated SSR mounted in the power amp. Something like this but there are loads of clones on eBay etc. Just make sure it is able to cope with the inrush current at power-up.
For me I have a single ground to protective earth connection on my power supply PCB.
I don't think the multiple ground returns on each of the three Power connectors is a good arrangement but that will depend on your PSU / regulator arrangement upstream.
I have not done it yet but I do intend to use the Arduino to remote power-up/down the power amp. This will be simple with a opto-isolated SSR mounted in the power amp. Something like this but there are loads of clones on eBay etc. Just make sure it is able to cope with the inrush current at power-up.
see http://www.diyaudio.com/forums/anal...urce-selection-controller-63.html#post4980588
Using the SMD version on an adapter is probably the way to go (looking at that option myself)
Using the SMD version on an adapter is probably the way to go (looking at that option myself)
Yes, they work fine. Have to bend one lead around the other though as the pinout ids different. Not sure how much you can tell from the pic.
I like your solution better..
Probably
I use this one: Ecran OLED 1.3" 128X64 SH1106 Blanc interface I2C - Audiophonics
It works with U8g2lib but it is very slow and not very convenient.
The address is the standard address (0x3C).
Actually i use an OLED 0,6" SSD1306 and it works fine with your librairies but it is too small.
nounouchet
That one looks like it should work. Do you get a black screen or some other symptom?
This is what I have:
Code:
#define OLED_TYPE SH1106_128x64
#define I2C_ADDRESS 0x3C
oled.begin(&OLED_TYPE, I2C_ADDRESS);is it not working for you like this?
Yes, they work fine. Have to bend one lead around the other though as the pinout ids different. Not sure how much you can tell from the pic.
Thanks for your answer, before to receive the VN2222LL, I tried the ZVNL110A it work well too, this Mosfet has a low Vgs th 0,75 to 1,5 V.
Hello everyone, and - thank you for this gorgeous project!
Couple of years ago, my (ex) colleagues and I did something similar to this, but it was PIC based, and LDRs had to be paired. That project was actually never 100% finished, had some bugs regarding remote control etc, and was eventually put to sleep. In the images attached you con see how it looked, back in time.
I always wanted to build one for myself (it was meant to be a commercial product, those ones we've built were sold), and just when I thought it was time to have this project awaken, I saw this thread, and now I'm completely hooked to build this version of preamp and forget about PIC, since this is the right way to do it
I'm not the programmer, though; I can see what's happening in the code, but I cannot write it on my own. So, I'll be learning along the way, and I have some questions, so be kind:
1. I have some fancy 4x20 LCD with white letters/black background, but it's not I2C, so I was wondering can it be used with your code as-is, I saw that there are some adapters for Arduino (PCF8574)?
2. Neb Zdr, many thanks for your contribution, I like your OLED version very much, did you think of implementing a VU meter, since it looks like there would be enough space on display for this feature?
Couple of years ago, my (ex) colleagues and I did something similar to this, but it was PIC based, and LDRs had to be paired. That project was actually never 100% finished, had some bugs regarding remote control etc, and was eventually put to sleep. In the images attached you con see how it looked, back in time.
I always wanted to build one for myself (it was meant to be a commercial product, those ones we've built were sold), and just when I thought it was time to have this project awaken, I saw this thread, and now I'm completely hooked to build this version of preamp and forget about PIC, since this is the right way to do it
I'm not the programmer, though; I can see what's happening in the code, but I cannot write it on my own. So, I'll be learning along the way, and I have some questions, so be kind:
1. I have some fancy 4x20 LCD with white letters/black background, but it's not I2C, so I was wondering can it be used with your code as-is, I saw that there are some adapters for Arduino (PCF8574)?
2. Neb Zdr, many thanks for your contribution, I like your OLED version very much, did you think of implementing a VU meter, since it looks like there would be enough space on display for this feature?
Attachments
Hello everyone, and - thank you for this gorgeous project!
Couple of years ago, my (ex) colleagues and I did something similar to this, but it was PIC based, and LDRs had to be paired. That project was actually never 100% finished, had some bugs regarding remote control etc, and was eventually put to sleep. In the images attached you con see how it looked, back in time.
I always wanted to build one for myself (it was meant to be a commercial product, those ones we've built were sold), and just when I thought it was time to have this project awaken, I saw this thread, and now I'm completely hooked to build this version of preamp and forget about PIC, since this is the right way to do it
I'm not the programmer, though; I can see what's happening in the code, but I cannot write it on my own. So, I'll be learning along the way, and I have some questions, so be kind:
1. I have some fancy 4x20 LCD with white letters/black background, but it's not I2C, so I was wondering can it be used with your code as-is, I saw that there are some adapters for Arduino (PCF8574)?
2. Neb Zdr, many thanks for your contribution, I like your OLED version very much, did you think of implementing a VU meter, since it looks like there would be enough space on display for this feature?
Thanks! I2C is a must due to limited number of GPIO pins. I2C bus is used to control both port expander and display. You could add another Arduino on I2C bus just to control display, but that would be an overkill if you just want to reuse your old stuff. These big OLEDs are 20eur, so not worth it IMHO.
I am not too excited to have VU meter in there, so it won't be coming from me. Foobar is doing that already
Pozdrav.
Of course, I know all this.
Perhaps you misunderstood my question a bit, let me rephrase - could I use hd47780 display IF I put the I2C adapter chip (like this ) and use your code as-is, without changes? I have noticed that most of the 4x20 displays you search on AliExpress, for example, actually use exactly this board, so I thought - if they work, why wouldn't this...
And, this is just because I already have some displays I'd like to use.
I guess that my final version will be with OLED, but I wouldn't want it less than 2.42"
I guess that should work, i2c adapters are cheap.
Sent from my ZTE A2017G using Tapatalk
Hello everyone
I discovered this thread a short time ago and am very interested in the realization of this project. I have ordered for the components and to this day I have in my possession an OLED display (0.96 - 4 pins) but one of the connections is SCK and I see on many assemblies that it is called SCL.
Is this the same connection and this display can be suitable?
Thank you.
I discovered this thread a short time ago and am very interested in the realization of this project. I have ordered for the components and to this day I have in my possession an OLED display (0.96 - 4 pins) but one of the connections is SCK and I see on many assemblies that it is called SCL.
Is this the same connection and this display can be suitable?
Thank you.
I try order a power supply pcb to 'www.shenzhen2u.com'.
But after upload the file 'LDR ATT power supply GERBER.zip' provided on post 106, anything displayed on preview is only related to controller pcb, not PS.
Also I still not found anywhere a suitable bom parts list for the power supply.
Thanks in advanced
But after upload the file 'LDR ATT power supply GERBER.zip' provided on post 106, anything displayed on preview is only related to controller pcb, not PS.
Also I still not found anywhere a suitable bom parts list for the power supply.
Thanks in advanced