Hello folks,
A few days ago I decided to mount this Midi to CV/Gate Converter.
Unfortunately it doesn't work.
The PIC seems to work, as the LED blinks at startup (3 long, followed by short blinks, then lights off).
If I press the learn/mode switch, the LED remains lit, waiting for the midi message.
So it seems it never receives any message.
I checked the input, at both pin 4 and 5 of midi connector:
biased to 5 volts, straight line when no notes are played, short (negative going) pulses when Logic is playing notes.
The output of the optocoupler (pin 6), stays high (~ 5V), and I'm not seeing any pulse, even when the notes are played.
Always straight line to 5 volts.
I'm afraid I've fried the coupler, or this is normal?
Any test I could make with a simple transformer? (I was thinking of momentarily remove the opto, feeding PIC's input from the sec of a transformer), just to see if the rest of the circuit behaves as it should.
Is this a good idea to test? Should I hook up the trafo sec. to +5V?
I'm a newbie about PICs and MIDI, any help greatly appreciated.
Thanks in advance.
A few days ago I decided to mount this Midi to CV/Gate Converter.
Unfortunately it doesn't work.
The PIC seems to work, as the LED blinks at startup (3 long, followed by short blinks, then lights off).
If I press the learn/mode switch, the LED remains lit, waiting for the midi message.
So it seems it never receives any message.
I checked the input, at both pin 4 and 5 of midi connector:
biased to 5 volts, straight line when no notes are played, short (negative going) pulses when Logic is playing notes.
The output of the optocoupler (pin 6), stays high (~ 5V), and I'm not seeing any pulse, even when the notes are played.
Always straight line to 5 volts.
I'm afraid I've fried the coupler, or this is normal?
Any test I could make with a simple transformer? (I was thinking of momentarily remove the opto, feeding PIC's input from the sec of a transformer), just to see if the rest of the circuit behaves as it should.
Is this a good idea to test? Should I hook up the trafo sec. to +5V?
I'm a newbie about PICs and MIDI, any help greatly appreciated.
Thanks in advance.