[sdiy] [SDIY] Frequency regulating circuit

[Jason Proctor]

just play a semitone down!

:-)



>Hi people! I have an old toy keyboard i'm trying to transform into a 
>legitimate instrument but it is tuned a semi tone up! It is 
>impossible to change this internally because this is one of those 
>sound generators on a chip type keyboard.
>
>Do you know of any circuit that can shift up or down the frequency 
>of a sound to a certain frequency value? And i'm talking cheap and 
>analogue!
>
>
>Thanks
>
>diogo