PIC OSCILLATOR DESIGN QUESTION

Status
Not open for further replies.
J

JJFORTY

Member level 1
Joined
Nov 16, 2004
Messages
40
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
368
Hi, guys

I want to build a project from the design idea magazine, but i don't know what to use to drive the frequency control inputs (4pins). As i understand these inputs have to be digital so the PIC program can compute using a look-up table and output a desire frequency. Can I use a 4 pin Digital Pot or an encoder ?

Any Suggestions?

Thanks for Looking

Source of project : **broken link removed**
 

Any TTL output will do
 

How do you want to control this circuit? The above design uses 16 values (0-15) on 4 pins for frequency control. Basically, you could use 4 switches to get the 16 different values. That seems a bit clumsy to me, though.

There are BCD and Hex rotary switches that encode on 4 output pins (+gnd) that would work. Pull the outputs high. Here's one example from a US surplus outfit but there are pretty widely available.


If I were doing this, I'd use a flash pic so I could change the program - probably a 16F628A. I'd also use a serial interface to control it from a PC. 16 values might not be enough...
 

    J

    JJFORTY

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…