I don’t see why this shouldn’t work seeing as the DOUT would be interfacing with a 3V 50mA LED inside of the photo relay. This would be a lot cheaper than buying a few dozen reed switches (0,15 euro each when ordering > 10). And the 1.5ms average on-time is pretty snappy.
Any thoughts?
(I moved this post from Midification because it’s a more general question)
Very good point. I’ve no experiences with photo MOS delays, but it looks like a 4066 w/o galvanical connection, which is good! Somebody has to try this on some real gear
Btw.: according to the data sheet, the LED operating current is 1.4mA typical, and 3 mA maximum (not 50 mA) - thats even better
So, you don’t need any additional components, right? Just Pin 1 via 220 Ohm resistor the digital output of the 74HC595, Pin 2 to ground, and pin 6/4 to the keyboard. What happens with pin 5?
TK: you’re correct - and no extra parts are needed
I successfully midified the keys of a Jen SX 1000. Its keyboard scanner has a matrix of 3 octaves x 12 notes. I simply connected pin 4 to the one of the three octave wires and pin 6 to one of the twelve note wires and it worked!
So pin 5 need not be connected in this configuration.
The response is fast too! I had some fast note-sequences playing without any noticeable lag or squishiness.
