Loading ...
Sorry, an error occurred while loading the content.

Messages List

7046

Re: Korg poly-800 diode info

Hi Don, I believe that's why Q1,Q3,Q18 as well as various caps and other components were replaced, I just inherited this keyboard as non working(missing -5V
yamaha_dx5
Feb 1
#7046
 
7045

Re: Korg poly-800 diode info

I don’t see any way that D1/R1 and the CR2032 could affect the –5V rail. I think Q1 could mess up the ground line for both +5 and –5 and make them both
backshall1@bellsouth.net
Feb 1
#7045
 
7044

Re: Korg poly-800 diode info

Hi Don, the 596-4 board does have a battery soldered and hotglued between IC18 & IC19 as well like previously mentioned D1 & R1 in place and soldered. The
yamaha_dx5
Feb 1
#7044
 
7043

Re: Korg poly-800 diode info

1N4001 is fine for D2. 1N4148 is NOT the same thing at all for D1. Did you check to see if the solder pads are there between IC 18 and IC19, where a CR2032
backshall1@bellsouth.net
Feb 1
#7043
 
7042

Re: Korg poly-800 diode info

Hi, you're correct about 596-8 only D2 is on the board w/2032 batt like you mentioned. But 596-4 does have both D1 & D2 thats why I was asking as the legs are
yamaha_dx5
Jan 31
#7042
 
7041

Re: Korg poly-800 diode info

I don’t think you would even see D1 on 596-8. It’s a zener diode that supplies power to the memory chip from the 6 C-cells when power is turned off. Since
backshall1@bellsouth.net
Jan 31
#7041
 
7040

Korg poly-800 diode info

Hi, can someone give me some alternatives for D1=HZ-5CLL-TD and D2=SR1K-2 . I noticed there are some differences between Klm-596-4 and Klm-596-8 unfortunately
yamaha_dx5
Jan 31
#7040
 
7039

Re: SynthonaChip demo

It sounds like there would be no problem getting the two to talk with each other. Right now I have a standard 31250 8bit 1 stop bit non parity serial port to
Synthetech
Jan 30
#7039
This message has attachments
  • JPG
    832 KB
  • JPG
    877 KB
  • JPG
    966 KB
7038

Re: SynthonaChip demo

I have other projects going that use Eclipse with SDCC. The big challenge I have right now is making a choice. Do I create a 80C85 emulator/compiler that runs
    support
    Jan 30
    #7038
    This message has attachments
    7037

    Re: SynthonaChip demo

    I follow you now.. Currently I have control over the parameters via MIDI CCs. But they will run out fast with all the options I can fit in. Especially if I
      Synthetech
      Jan 30
      #7037
      This message has attachments
      7036

      Re: SynthonaChip demo

      The board itself is OK for what it needs to do now. Which is to dramatically improve envelopes, sequencer, LFO's, velocity, modulators etc etc. With that in
        support
        Jan 30
        #7036
        This message has attachments
        7035

        Re: SynthonaChip demo

        Mike, what F4 chip are you using? A dual DAC I drive uses a I2S port. It is driven via interrupt triggered DMA. The bit rate/clock is approx 1.4Mhz for
          Synthetech
          Jan 30
          #7035
          This message has attachments
          7034

          Re: SynthonaChip demo

          Hi Blaine, See the picture. This is the CPU replacement for the Poly-800. I just ordered 100 pieces to begin testing the hardware and writing new software. The
            support
            Jan 30
            #7034
            This message has attachments
            7033

            Re: SynthonaChip demo

            Hi Mike, I would be interested in collaborating with you. Did you have anything in mind or any details? I am still ironing things out with this.. but I
            Synthetech
            Jan 29
            #7033
             
            7032

            Re: SynthonaChip demo

            Hi Blaine, it's great work! I am in the process of testing a new board for the Poly-800 that is based on an STM32F4 too! The design doesn't give the Poly any
            support
            Jan 28
            #7032
             
            View First Topic Go to View Last Topic