Hi everyone,
I'm having a hard time with LTC1799...
I built modules using GetLoFi and Sailormouth schematics but I can't make them work with my PT-88 and SA-5 keyboards. Those use crystals with 3 legs.
What I did :
Connected pin 2 to Ground
Connected pin 1 to a stable +5v (+6.4v on the PT-88 lowered to +4.8v using a resistor)
I have a 100nf cap ("104") between pins 1 and 2
I have a 500k pot between pins 1 and 3, with a 10k resistor to avoid possible crash
Pin 5 is connected to a switch to switch between ground and +5v
I tried to connect pin to all three legs of the crystal, with or without the leg still on the board.
I tried with two LTC modules to be shure I did not damage the first chip as I mixed up pins 1 and 3 on my first attempt (not that I thing this is a real issue) : none of them work.
So : how do I make it work ?...
Thanks in advance for your help as I spent a very frustrating afternoon...
(Hopefully I'm going to see Lee Ranaldo at a gig tonight so this will save the day
)
EDIT : pin 4 is for pin 5 and vice versa... I did it right on my layout.