[MIDIbox FM Planung]

Ich benutze ebenfalls ALPS Stec12e Encoder gekauft bei Reichelt. Meine Erfahrung ist auch, dass der Modus DETENTED3 am besten funktioniert bei denen. In den Modi 1 und 2 passieren oft einfache Parameter-Sprünge beim blossen Berühren der Encoder, resp. dann zusätzliche Sprünge nach dem Drehe am Encoder (in die eine oder andere Richtung). DETENTED3 funktioniert aber einwandfrei. Die Encoder sind im Übrigen korrekt angeschlossen :thumbsup:

[Change macros.h in Midi-Filter/Processor]

HI

I want to build a this little helper Midifilter to convert Midi CC messages to Sysex-strings for the Waldorf Microwave1.

I stumbled on the IFSET and IFCLR macros in macros.h which are not read correctly by GPASM. These macros have been changed to a new version by thorsten on most apps but not for the Midifilter.

As I understand, only thing to do is to replace the macros by the new ones and change the sourcecode for the new macros?

But why do BTFSC and BTFSS need 3 arguments in these macros?

(reg= Register-Name/Number; bit=Bit-Name/Number; but what's the argument reg_a????)

cheers, Nick

BRA_IFSET MACRO reg, bit, reg_a, label

btfsc reg, bit, reg_a

bra label

ENDM

BRA_IFCLR MACRO reg, bit, reg_a, label

btfss reg, bit, reg_a

bra label

ENDM

GOTO_IFSET MACRO reg, bit, reg_a, label

btfsc reg, bit, reg_a

goto label

ENDM

GOTO_IFCLR MACRO reg, bit, reg_a, label

btfss reg, bit, reg_a

goto label

ENDM

CALL_IFSET MACRO reg, bit, reg_a, label

btfsc reg, bit, reg_a

call label

ENDM

CALL_IFCLR MACRO reg, bit, reg_a, label

btfss reg, bit, reg_a

call label

ENDM

RCALL_IFSET MACRO reg, bit, reg_a, label

btfsc reg, bit, reg_a

rcall label

ENDM

RCALL_IFCLR MACRO reg, bit, reg_a, label

btfss reg, bit, reg_a

rcall label

ENDM

[help needed with LCDs]

You cannot drive them with 12V directly but as you suggested with a resitor in series that regulates voltage and current. The forward voltage for this type of LEDs is 3.5V according to the datasheet.

Current is 120mA. That means: R = (Vin-Vled)/Iled = (12V-3.5V)/0.12A = 62,5Ohm. BUT... the Problem you face now is that you cannot use a standard 1/4 Watt resistor, since it would melt away due to its power rating. P= (I^2)xR = (0,12A^2)x62,5Ohm = 0,9Watt.

Using a pot in series would be an option and convenient for adjusting the backlight...same problem with power though. You gotta calculate that.

Thanks for your helpful explanations. Indeed I would have missed about the power ratings (btw: (12V-3.5V)/0.12A = 71Ohm; and P= ~1Watt).

For now I will go for the Resistor and Pot. if some illumination jitter appears I can switch to the Transistor based current-source

Can you please explain me the purpose of the 10k Resistor between 5V and the BC337's collector in the core32 schematic?? Is it really needed?

ok, this may not be helpful, but you could always switch to vfds and sell the lcds to some new-schoolers :-)

merry x-mas!

Dam...indeed VFDs do look old-skool... would make a great design accompanying retro synths

however my first MB SEQ will sit in front of a NordModular, a NordModular G2 and a Blofeld... so no need for style yet

[help needed with LCDs]

I've got 2 of these LCDs: digikey optrex (datasheets at digikey!)

black dot's and white LED backlight

My general problem is, they are not equally illuminated and have unequal contrast!

thus I probably have to use two separate illumination/contrast control circuits.

As for contrast, this is not difficult... but I have some uncertainties with illumination:

1. I'm no expert but I guess I could also drive the backlight LED's with 12V???

12V are used since I want to connect an AOUT_NG-Module and also need 12V Gate Outputs (Roland System100 and hopefully some other in the future).

furthermore, 12V for LED backlight would be much appreciated by the 7805 which gets really hot (~90°C at 250mA backlight current [spec. stats a max current of 125mA for each modules backlight])

2. could I use just a resistor and a pot in serial instead of the constant current source for each module? or would this lead to unstable illumination? I'm using a 12V 1.5A switched PSU.

any help is much appreciated!!!

and merry x-mas to all

[How to handle dual color LEDs???]

Hi

I'm prepared to build a SEQ V4 which makes me very excited....

Core Module, DIN and DOUT Modules, Knobs, Encoders, PS ... almost everything is ready!!!!!!!!!!!!!!!

There is just ONE uncertainty here after reading back and forth trough device descriptions, forum and MBSEQ_HW.V4:

How to handle the LED's of GP Buttons and Step-Indicator???

I will use these GP (step) buttons: Buttons

Either I will use dual color LED installed to the buttons or standard LED to the buttons plus a separate Line of 16 LED's for step indication.

The concepts are some what different. For the first unmuted steps LED have to be de-illuminated when step-indicator comes to respective step. Whilst for the second option with a separate line this is not desired!

My quenstions are: Are both options possible? and what are the respective configurations I have to make in MBSEQ_HW.V4?

can I use this section for either option? (line 47)

# DOUTs for Dual Color option:

GP_DOUT_L2_SR 0

GP_DOUT_R2_SR 0

or do I have make my configurations within here: (line 61)

##################################################

# Optional BLM Matrix

##################################################

isn't the later section intended for the usage of separate dual color LED's for each track of a track-group? I only want the respective track highlighted by the track selection buttons to be indicated by the LED's

regards, Nick

[PIC18F452 Out-Pin circuit blasted???]

Just finished my first MIDIBOX: a CV Interface with AOUT_NG Module

During testing and troubleshooting I may have applied 12V to J5-A6 output-Pin = Gate-Out7 accidentally

this pin now outputs 4.85V constantly, also after reloading of the application and MIOS

damn... this make me think that the output circuitry of thr respective pin has been blasted!!!

is this the likely reason for the unusual output? any chance to fix??

do I need to replace the PIC?

All Gate-Outs are connected to +IN of Quad-OpAmps to gain the Gate-Signals to 10V;

2 pos-INs are adjacent to the Vd which is fed by 12V. blast may have occurred through shortening when I probed this IN

Could I avoid another blast by putting a resistor between the PIC-OUT-Pin and the OpAmp-In??? and how much ohms should I choose?

thanks very much