Hi Guys
I was hoping you could give me some direction, I am currently playing around with a keyboard (cheap Discovery Kids keyboard) which uses a crystal oscillator for the pitch/clock control
The crystal on board is about 14 MHz (14.13181)
I am looking for a variable oscillator option to replace this crystal. At the very top end of the 555 range I can get the bottom end of the keyboards operating frequency (I believe 555 tops out around 500 KHZ) but it is no where near capable of the high frequencies necessary to drive the keyboard effectively.
Most of the transistor based oscillators I am aware of cannot be adjusted via a pot so I could use them for a static pitch switch but not a variable one.
I know the LTC1799 is an obvious choice but Get LoFi is currently sold out of both their breakout boards and kits. As far as I know this chip is not available as a DIP chip and I am not really set up to work with SMDs. Also since this is a fairly cheap keyboard and I'm not sure what else I'll be able to get up to in it I would prefer to build something with parts I have on hand rather than paying for and waiting for a specialized chip. At least initially until I see how far it goes.
Any suggestions or schematics you guys could recommend would be greatly appreciated