veermaster Posted June 9, 2011 Report Posted June 9, 2011 (edited) The cheapest alternative I have found was to use 4 DOGM 2x16 displays at $65 (so about 45 EUR) which are also quite compact at 230mm width total. Best, Alex But these need an additional backlight module each which again raises the price... Well the alternative would be something like this: cheaper and even more practical, especially when you would like to break up with the "parallel channels" paradigm. (This is taken from the programmer's section of the forum, and it's an implementation by TK.) Could you please provide a link, this looks very nice indeed! Cheers, Emre EDIT: Just found the link: Edited June 9, 2011 by veermaster Quote
Kieftenbelt Posted June 9, 2011 Report Posted June 9, 2011 I really like the whole concept, just one PCB for faders, and it's looking so easy! Thanks for sharing, can't wait to built my own 'little home console' Quote
Screaming_Rabbit Posted June 10, 2011 Report Posted June 10, 2011 But these need an additional backlight module each which again raises the price... ... naaa... OLEDs don't need backlight - Do you have a backlight for your LEDs too? :frantics: Quote
veermaster Posted June 11, 2011 Report Posted June 11, 2011 ... naaa... OLEDs don't need backlight - Do you have a backlight for your LEDs too? :frantics: I didn´t mean the OLEDs but the DOGM Displays, but I agree my post can be misunderstanding. Cheers, Emre Quote
alekzander Posted June 11, 2011 Report Posted June 11, 2011 I didn´t mean the OLEDs but the DOGM Displays, but I agree my post can be misunderstanding. Cheers, Emre Ordering from Mouser in the US, the cheapest DOGM 2x16 display is $11.41 and the backlight is $2.86. More if you want white, blue or RGB. The $65 was 4 displays and backlights including shipping within the US. Alex Quote
veermaster Posted June 12, 2011 Report Posted June 12, 2011 That indeed is a very good price. Thanks for the tip, if only I knew earlier... :) Emre Quote
veermaster Posted June 19, 2011 Report Posted June 19, 2011 Just to be on the safe side: Is it ok to power the motorfaders directly with a 7,5V switching psu and take the same source to power the Core8 (which has the 7805 bringing the 7,5V down to 5V). I know a dropout voltage of at least 2V is needed so that shouldn´t be a problem, I just ask if there is any other problem when powering both sections by the same switching psu that I don´t know of...? Thanks in advance, Emre Quote
Screaming_Rabbit Posted June 20, 2011 Report Posted June 20, 2011 (edited) It's no problem, to power them from the same PSU (BTW: This is the way it's done on TK's shematic too). What I'm not sure in your question: "Power directly" - Do you mean without a regulator on the "motor side"? If yes, this would be possible too but you can't "tune" the voltage then, which is very assumable to be needed, for the control-regulation to work smoothly (adjusting the speed of the motor). Greets, Roger EDIT: I wouldn't design limitations from the beginning. You're not sure until testing, if 7.5V will be enough for your faders. Better allow the circuit to run up to 10V on the motor side. Edited June 20, 2011 by Screaming_Rabbit Quote
veermaster Posted June 20, 2011 Report Posted June 20, 2011 (edited) It's no problem, to power them from the same PSU (BTW: This is the way it's done on TK's shematic too). What I'm not sure in your question: "Power directly" - Do you mean without a regulator on the "motor side"? If yes, this would be possible too but you can't "tune" the voltage then, which is very assumable to be needed, for the control-regulation to work smoothly (adjusting the speed of the motor). Greets, Roger EDIT: I wouldn't design limitations from the beginning. You're not sure until testing, if 7.5V will be enough for your faders. Better allow the circuit to run up to 10V on the motor side. Thank you Roger for your input! What always worried me was the fact that the datasheet of the Alps Motorfaders says they suck up to 800mA at 10V. For eight faders that would mean max 6,4A which I didn´t know how to realize that easily. So I thought I get a strong switching PSU like http://www.reichelt.de/Schaltnetzteile-Case-geschlossen/SNT-MW150-7-5/index.html?;ACTION=3;LA=444;GROUP=P861;GROUPID=4959;ARTICLE=85211;START=0;SORT=artnr;OFFSET=1000;SID=28VRnYOKwQARwAABPwTEE00a4566ac3afda6483845e24af133dda which has an adjustable output of 7.13 ~ 8.25V at 20A and use it to power the motors of my faders directly without any regulation inbetween. By also powering the Core8 (with regulation) I would have a load to stabilize the output voltage even when no fader is moving. Anyhow yesterday I took off the strap/belt (?) of one of the the motors and measured current when run on 7,5V. It was just 20mA, even when I touched the motor to make it work harder (simulating it driving the fader) it only went up to maybe 30/40 mA. Still very far away from 800mA which I guess might only be reached when you fully stop the motor by force, but since later the touch function will stop the motor anyway there is no such high current to be achieved. So in conclusion a LM317 with its max 1,5A should indeed be enough to power eight faders. Probably everybody knew all of this before, I´m just thinking loud... Regards, Emre Edited June 20, 2011 by veermaster Quote
Screaming_Rabbit Posted June 20, 2011 Report Posted June 20, 2011 I also don't know where these 800mA from Alps come from but I never experienced them to suck this much current. BTW: Stopping the motor without touch is possible (e.g. something lies on the desk and the fader can't move further). For this case, I'll place a PTC-Resistor into the motor-power feed. Greets, Roger Quote
veermaster Posted June 20, 2011 Report Posted June 20, 2011 Just as an info: Out of curiosity I measured the current at 7,5V when fully stopping the motor by force: 330mA... At 9V it´s 380mA... Roger, thanks for the tip, I´ll just make sure my cat stays at home so nothing gets in the way of my faders ;-) Cheers, Emre Quote
cinhcet Posted July 3, 2011 Report Posted July 3, 2011 Hi I assembled the MF_V3 on a vector board, unfortunately, it doesn't work :-( I've uploaded MIOS and the MF_V3 application on an other board, so I know that this could not be the problem. The LED continues going on and off. This is the only behaviour that the module shows. All voltages are correct. I'm sure there must be a problem, but I can't find it. Maybe you can give me a hint whereupon i should look after. Any ideas? Thank you! Quote
cinhcet Posted July 3, 2011 Report Posted July 3, 2011 I think, I've found the reason! The midi cables i used don't work with my keyboard. Maybe they are broken. Tomorrow, i know more! Sorry for asking.... But perhaps this is not the reason :-D Quote
Erics Posted August 1, 2011 Report Posted August 1, 2011 Are there any news about the Eagle Layout file? I would like to build up one Board to test that. I could do the Layout on my own as well, but to get it here would be faster. Quote
TK. Posted August 1, 2011 Author Report Posted August 1, 2011 You can contact SmashTV for the current .brd file (he improved it meanwhile) Best Regards, Thorsten. Quote
smashtv Posted August 2, 2011 Report Posted August 2, 2011 I got sidetracked on this. Do not forget to run the ratsnest command or you will be missing some crucial ground paths. Best regards! Timv1.brd.zip Quote
Nasrudin Posted September 8, 2011 Report Posted September 8, 2011 Hello Thorsten, will this mf module be compatible with the LPC17 (and its extensionboard with the external ADCs etc.) without major changes? Greetings, Nasrudin Quote
TK. Posted September 8, 2011 Author Report Posted September 8, 2011 will this mf module be compatible with the LPC17 (and its extensionboard with the external ADCs etc.) without major changes? This module provides an autarkic handling of motorfaders thanks to the PIC which is part of the module. Therefore no external ADC or whatever is required when you are using it in conjunction with the LPC17 module - just connect it to a free MIDI IO port. (Note that a third MIDI IO port is available at J5B.A6/7 of the core module - this will be properly documented once the project is officially released) Btw.: I ordered some prototypes with SmashTV's layout meanwhile. If anybody is interested, I will sell them for 8 EUR (high price because of the low quantity that I ordered) Best Regards, Thorsten. Quote
TK. Posted September 15, 2011 Author Report Posted September 15, 2011 Meanwhile I got the prototype PCBs... it works!!! Thanks SmashTV for the great layout! :) I've 13 spare PCBs which I'm selling for 8 EUR per piece. If you are interested, just write me a PM with your postal address and PayPal account Best Regards, Thorsten. Quote
chrisk Posted September 19, 2011 Report Posted September 19, 2011 I've 13 spare PCBs which I'm selling for 8 EUR per piece. If you are interested, just write me a PM with your postal address and PayPal account Hi Thorsten, i want to buy three of your pcb's. I've sent you a message. Best regards, Chris Quote
ilmenator Posted September 19, 2011 Report Posted September 19, 2011 i want to buy three of your pcb's. I've sent you a message. Welcome chrisk! Not sure why you post that here, though? Quote
TK. Posted September 19, 2011 Author Report Posted September 19, 2011 The PCBs are sold out now! I will ship in ca. 1..2 days once I got the money from everybody. Meanwhile I also created a Reichelt Orderlist which can be downloaded from http://www.ucapps.de/mbhp_mf_ng.html Best Regards, Thorsten. Quote
TK. Posted September 21, 2011 Author Report Posted September 21, 2011 Shipped today: Ilmenator Protosx Smidirin Chrisk Stools Sold out! :) Best Regards, Thorsten. Quote
Protosx Posted September 26, 2011 Report Posted September 26, 2011 TK, boards arrived today!!!! Thank you very much! I'll start to solder this night. Thank you again. Bye Protosx Quote
ilmenator Posted September 26, 2011 Report Posted September 26, 2011 The board to Norway arrived today - thanks! Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.