Lamouette

Love the squared led matrix !

Ok, all is working like it should be i haven't connected everything yet. One questions. I use a TPD and the CV/GATE/CLOCK/TRIGGER side by side. TPD is connected and powered by the SEQ PSU, which is a PSU with no connection to ground. (i will have to connect the CORE_STM32F4 ground to it) I use my eurorack power supply to power the AOUT_NG, Only the +12V/GND/-12V If i understand correctly, on the AOUT, the GND will be different from 5V and +12/-12V.   Can it be a source of problems like ground loops ? Is there a problem about removing the +5V and GND from the J1 connector on the AOUT_NG and power it with the eurorack PSU ?   By writing this expect another problem, GATE/CLOCK/TRIGGER, come from a DOUT, which have is proper ground so anywat i will get a ground loop ?   Thanks for your asnwer ! EDIT : (another thinking) I have a SEQV4 PSU which provide +12/-12V so i can power everything from it, but, same problem, i will have ground loops between my eurorack PSU,adn the SEQ PSU, when i will connect a jack between CV/GATE/CLOCK/TRIGGER jack's and an input of my modular ?  

Thanks for your answer ! I resolved my problems, and it is now working, but i don't understand what i did, led was always lit, i shuted down, and re power on my SEQ, and it was working perfectly ? Really strange behavior.   But it was really interresting to test it. i realise how i loved to build kits, but how it is bad to build something you don't understand. I read a lot yesterday about simple components, and decided to buy a book to learn deeply what i am doing, i suppose this is the next DIY step. but after 4 years, i really need to understand. i also realise how, i hated the electricity at the school, and haven't remembered anything !   So i restart from nothing, and i feel happy to learn htings ! Sorry for the philosophical post. To explain, i have a DOUT on a seperate PCB, i will build the gates led on a separate breadboard, and attach it on the back of my eurorack panel, with the AOUT _NG, and the TPD.  

Hi, I continue here to get about my problems. So, i made a separate eurorack panel with a TPD, and the CV outputs ( CV/Gate, / clocks / triggers) I want to add leds for the gate outputs. I checked some schematics about how it is done. (Especialy Hexinverter midi2cv, Yusynth, and Altitude euro Aout here on midibox) i understand how it works, but i am not able to get it working. Some data : Gate Voltage mesured : 4.8V Leds : 20mA 1.85V ( so 470R resistor) Transistor : 2N3904   If i understand this is a NPN, so closed by default, and it will opens only when a bit of current is flowing, (current provided by the gate)   But the led is always lit.   Should i ad a resistor between to leg to create a kind of fake load ?    

Don't want to hijack the thread, but i tried the schema, with the good value for my leds, but impossible to get it working. i have 4.8V at the gate output, and used 470R resistor for my led. The datasheet for the BC547 say : Emitter-Base Voltage 6V, is my gate voltage to low to open it ?

I already did the front panel, and don't want to add a specific DOUT only for this.   I will use Altitude value and check what happens !

Hello, altitude, i am on the way to add leds to my gate outputs. Are you using BC547 as transistor ? i try to understand how it works, i checked shematics of the midi2CV of hexinverter, some yusynths pcbs, and yours , you all use a transistor, but no one use the same way to accomplish this (maybe it is the basics, sorry if it is THE noob question).  

Still interrested too !

Don't you need to add a diode (like a 1N4148) after the resistor after the 595 to protect it in case of putting a voltage on the cv/gate/trigger/clock accidentally ?

Thanks a lot Hawkeye, you have been a really great helper !   Now i have to work the case, but that should be easier for me.   I will keep my thread updated, it could be a great help for someone like me who strart from nothing !   And finnaly it is funny as the first pcb i ever solderd (a DOUT), is the last i added to my build ! it was fun to check my first solder :)

Hell yeah, after huge reading, IT WORKS !!!!!!!!!!!!!! So after a long story, i just finished the electronics, a picture is needed to immortalise the moment, really, a great moment !  

This is really helpfull, thanks for doing this !

I trided to modifiy the shift register number, but it is not working : As the TPD in normal connection, is connected to 5 6 7 8 9 10, i suppose the shift register 1 2 3 4 already used by the wilba panel. (1&2 by wilba BLM, and 3&4 by BPM digit) I tried to put the TPD at the end of the chain, to avoid problems, so : Original config : # See also http://www.midibox.org/dokuwiki/doku.php?id=tpd_pcb ################################################## # set to 1 or 2 to enable the relative track position display # 0: TPD disabled # 1: TPD enabled - columns are cathodes, rows are anodes # 2: TPD enabled - columns are anodes, rows are cathodes TPD_ENABLED 2 # define the DOUT shift register to which the columns are connected (0=disabled) TPD_COLUMNS_SR_L 10 # for a 16x16 TPD: define the SR to which the right columns are connected (0=disabled, use only 8x8 TPD) TPD_COLUMNS_SR_R 7 # define the DOUT shift register to which the green LED rows are connected (0=disabled) TPD_ROWS_SR_GREEN_L 8 # define the DOUT shift register to which the right green LED rows are connected (0=disabled, use only 8x8 TPD) TPD_ROWS_SR_GREEN_R 5 # define the DOUT shift register to which the red LED rows are connected (0=disabled) TPD_ROWS_SR_RED_L 9 # define the DOUT shift register to which the right red LED rows are connected (0=disabled, use only 8x8 TPD) TPD_ROWS_SR_RED_R 6 ################################################## # CV and Gate/Trigger/Sync Setup ################################################## # AOUT interface now selected in CV Configuration Menu and stored in MBSEQ_GC.V4 file # please scroll through the menu to find this page! # the 8 CV gates can be assigned to a shift register (0=off, 1-32: number of shift register): # - 1st CV Gate available at DOUT SR output D7 # - 2nd CV Gate available at DOUT SR output D6 # - 3rd CV Gate available at DOUT SR output D5 # - ... # - 8th CV Gate available at DOUT SR output D0 CV_GATE_SR1 0 # and DIN Clock Outputs can be assigned to a shift register as well (0=off, 1-32: number of shift register): # D7..D0 will output individual clock or start/stop signals which can be configured in the CV configuration page CLK_SR 0 # additional gate triggers are available on common digital output pins of the # DOUT shift register chain - they are assigned to AOUT channel #16 (Note C-1, C#1, D-1, ...) # define the shift registers which should be used here (each provides 8 gates) # Note that SRs assigned to this function cannot be used as LED outputs (exclusive function) # Allowed values: 1-32, 0 disables the function, all other values invalid and not allowed DOUT_GATE_SR1 0 DOUT_GATE_SR2 0 DOUT_GATE_SR3 0 DOUT_GATE_SR4 0 DOUT_GATE_SR5 0 DOUT_GATE_SR6 0 DOUT_GATE_SR7 0 DOUT_GATE_SR8 0 # if set to 1, the additional DOUT "gates" will send 1mS pulses # useful for analog drums DOUT_1MS_TRIGGER 0 Modified config : # set to 1 or 2 to enable the relative track position display # 0: TPD disabled # 1: TPD enabled - columns are cathodes, rows are anodes # 2: TPD enabled - columns are anodes, rows are cathodes TPD_ENABLED 2 # define the DOUT shift register to which the columns are connected (0=disabled) TPD_COLUMNS_SR_L 14 # for a 16x16 TPD: define the SR to which the right columns are connected (0=disabled, use only 8x8 TPD) TPD_COLUMNS_SR_R 11 # define the DOUT shift register to which the green LED rows are connected (0=disabled) TPD_ROWS_SR_GREEN_L 12 # define the DOUT shift register to which the right green LED rows are connected (0=disabled, use only 8x8 TPD) TPD_ROWS_SR_GREEN_R 9 # define the DOUT shift register to which the red LED rows are connected (0=disabled) TPD_ROWS_SR_RED_L 13 # define the DOUT shift register to which the right red LED rows are connected (0=disabled, use only 8x8 TPD) TPD_ROWS_SR_RED_R 10 ################################################## # CV and Gate/Trigger/Sync Setup ################################################## # AOUT interface now selected in CV Configuration Menu and stored in MBSEQ_GC.V4 file # please scroll through the menu to find this page! # the 8 CV gates can be assigned to a shift register (0=off, 1-32: number of shift register): # - 1st CV Gate available at DOUT SR output D7 # - 2nd CV Gate available at DOUT SR output D6 # - 3rd CV Gate available at DOUT SR output D5 # - ... # - 8th CV Gate available at DOUT SR output D0 CV_GATE_SR1 5 # and DIN Clock Outputs can be assigned to a shift register as well (0=off, 1-32: number of shift register): # D7..D0 will output individual clock or start/stop signals which can be configured in the CV configuration page CLK_SR 6 # additional gate triggers are available on common digital output pins of the # DOUT shift register chain - they are assigned to AOUT channel #16 (Note C-1, C#1, D-1, ...) # define the shift registers which should be used here (each provides 8 gates) # Note that SRs assigned to this function cannot be used as LED outputs (exclusive function) # Allowed values: 1-32, 0 disables the function, all other values invalid and not allowed DOUT_GATE_SR1 7 DOUT_GATE_SR2 8 DOUT_GATE_SR3 0 DOUT_GATE_SR4 0 DOUT_GATE_SR5 0 DOUT_GATE_SR6 0 DOUT_GATE_SR7 0 DOUT_GATE_SR8 0 # if set to 1, the additional DOUT "gates" will send 1mS pulses # useful for analog drums DOUT_1MS_TRIGGER 0 But i got nothing on the TPD... Any thoughts ? The TPD have 9 Shift register but i can only see 6 assigned on the MBSEQ_HW.V4