Janis1279

Are your YAC512 pin 2 connected to GND ? ! I clean my pcb's, if need it with isopropyl spirit. Regards, Janis

I could be wrong. But your secondary DC voltage calculations refers to the power supply with not any load at the output! If you have possibilities to make this similar rectifier + the linear regulator model and to make some simple experiments with loads up to 100 mA, (I think, it's enough for the first time Midibox FM bi-polar power supply), it will give more details for your information. Regards, Janis

http://www.answers.c...e_rectification : ... The average and root-mean-square output voltages of an ideal full wave rectifier can be calculated as: ; Where: Vdc,Vav - the average or DC output voltage, Vp - the peak value of half wave, Vrms - the root-mean-square value of output voltage. π = ~ 3.14159 e = ~ 2.71828 Peak loss An aspect of most rectification is a loss from the peak input voltage to the peak output voltage, caused by the built-in voltage drop across the diodes (around 0.7 V for ordinary silicon p-n-junction diodes and 0.3 V for Schottky diodes). Half-wave rectification and full-wave rectification using two separate secondaries will have a peak voltage loss of one diode drop. Bridge rectification will have a loss of two diode drops. This may represent significant power loss in very low voltage supplies. In addition, the diodes will not conduct below this voltage, so the circuit is only passing current through for a portion of each half-cycle, causing short segments of zero voltage to appear between each "hump". ... Regards, Janis

Thank you Thorsten for your helpful reply ! Regards, Janis

I am building Midibox FM. I have question about a AOUT_LC module. AOUT_LC with 3*74HC595 chips on pcboard will be possible 12/12 bit resolution DAC's. Will that configuration really workable 4*AOUT_LC with MBFM? Is it not so slow? Sorry my question! I am not any expierence with DAC's. Thanks! Janis

Did you mean DOUT Module/ mbhp_doutx4_ledrings.pdf mbhp_doutx4_ledrings.pdf

From the MB64E setup_midibox16e.asm file : ; Although MIDIbox64E has been designed for rotary encoders, it can also handle with ; up to 64 pots/faders or up to 8 motorfaders. ; Pots and faders are mapped to the "encoder" entries 64-128.

http://www.mouser.com/catalog/635/1091.pdf

for MB64 the menu buttons and the other buttons are push buttons. In the setup_midibox64.asm file you can define : ; Number of connected buttons ; Allowed values: 1-64 #define DEFAULT_NUMBER_BUTTONS 64 ; number of connected buttons ; ; debounce counter (see the function description of MIOS_SRIO_DebounceSet) ; Use 0 for high-quality buttons, use higher values for low-quality buttons #define DEFAULT_SRIO_DEBOUNCE_CTR 32 http://www.ucapps.de/mbhp/mbhp_dinx4_32buttons.pdf

http://www.midibox.org/forum/index.php?PHPSESSID=8672ceb6daaa67070d21551f269466ce&topic=6735.0 http://www.midibox.org/forum/index.php/topic,13044.msg111261.html#msg111261

To power the opl3 module and maybe later the AOUT module(-es), is enough with this 15-0-15v 0.3A transformer. But to power the Core module from the another transformer with a little lower secondary voltage ~ 7,5 to 10 volts .

No. Note: To reduce effort only the DINX4 variant is available at Mikes PCB shop. If you don't want to etch the modules by yourself, just use the DINX4 and stuff just only the ICs which are really required. Note: To reduce effort only the DOUTX4 variant is available at Mikes PCB shop. If you don't want to etch the modules by yourself, just use the DOUTX4 and stuff just only the ICs which are really required. Pic18F452 auaimbctg.pdf auaimbctg.pdf

Hi. From comment The most current version the main differences: -the programming port J3 has been removed, since in-circuit-programming is now realized via the MIDI interface -J6/J7 and J8/J9 have been combined to 2*5 pin DIL sockets -the crystal is now mounted at the top of the board -the 1k pull-up resistor R12 has been added to the J4:RC port - this enhancement is required if you are planning to use a MBHP_IIC_* module like MBHP_IIC_MIDI. -two bypass caps C7 and C8 have been added to improve the power integrity. I think, you need add only + 2-row SIL Headers 2X5 + 2X5 + 2X5 = STIFTL. 2X40G 1pc + Jumpers or mini jumpers 5pcs , don't know Reichelt part# Regards, Janis

http://www.reloopdj.com/media/products/221546_RELOOP_SM.pdf page 18 : part list JOG201, JOG202 - SRGPHJ, page25: the schem how to connect the jog shuttles to the 74HCT165 and 10K resistors. May be it helps. Regards, Janis

Sorry. Be more accurate in schem reading ! Resistor R12 is connected to a +5volts rail, not GND ! MaY be this and the some similar connections causes a short circuit . Regards, Janis

Fine. With the multimeter and with a jack holes diameter compatible sized piece of wire , you can easy measured all pin connections.

You have the old working Core. checking the wiring to the external socket pins 4 and 5 of the both Cores will solve the problem. Answer about ground connection you will find there, too. http://www.geocities.com/JDPetkov/documents/pcref/midiport.gif

Yes, the black chips. 7 pots + 3 sliders =10 pots = 2*4051 (CD4051BE) 16 buttons = 2*74HC165 8 leds = 1*74HC595

The DOUT module comes with multiple serial registers 74HC595; every register provides 8 digital outputs, which are updated with the latch enable signal RCLK and shifted out with the clock signal SCLK. The advantage of using such shift registers is, that they can be cascaded to a long chain without the need of more than 5 cables to the core module. The DOUT board has been designed on a way which allows to cascade not only the ICs on the board, but also several DOUT modules. The DIN module comes with multiple serial registers 74HC165; every register provides 8 digital inputs, which are sampled with the latch enable signal LD and shifted out with the clock signal CLK. The advantage of using such shift registers is, that they can be cascaded to a long chain without the need of more than 5 cables to the core module. The DIN board has been designed on a way which allows to cascade not only the ICs on the board, but also several DIN modules.

in this string: #define DEFAULT_NUMBER_AIN 0 edit your pots quantity from 0 up to 8 for unmuxed mode , recompile , and pots will work.

Yes ,but without the some Shift Register chips. You can read more in the Ucapps MB Hardware Platform section.

the first SR pin HEX numbers : first 1 0 0×00 D0 / QA D7 / H first 1 1 0×01 D1 / QB D6 / G first 1 2 0×02 D2 / QC D5 / F first 1 3 0×03 D3 / QD D4 / E first 1 4 0×04 D4 / QE D3 / D first 1 5 0×05 D5 / QF D2 / C first 1 6 0×06 D6 / QG D1 / B first 1 7 0×07 D7 / QH D0 / A

From a Pic based Core article: "Every MIDI device comes with such an optocoupler which isolates the MIDI Input from the device on the other side, just to avoid any damage. For the case that you don't find a 6N138, you can also use a 6N139 (it's pin compatible)." Yes , it's a good replacement.

Are you corrected the some default values for pots in the setup_midibox16e.asm file : ... #define DEFAULT_NUMBER_AIN 0 ; ; you could enable the multiplexers here to test this application ; with a MIDIbox64 based hardware ; if 0: no multiplexers (a *must* when MF module connected) ; if 1: use multiplexers #define DEFAULT_ENABLE_AIN_MUX 0 ...

:D The chips and the pcboards arrived today ! Thank you , Thorsten ! ! !