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Thanks, Walter. That's interesting stuff, but as you say that guy was working with a very clean sine wave at a high s/n ratio. Relatively speaking, I'm trying to process some real junk.

Although...

The problem is not the speed/frequency of the signal. 100Hz and 1000Hz isn't all that fast, especially to a 30+MHz clock PIC. The signal is analog, not digital, and it's not at all clean.

If it...

Thanks for the files.

The problem that I see right off is that the PDF says that the worse case s/n ratio for that design is 23dB. That's quite reasonable for working with DTMF signals off a phone...

Thanks for the reply, Alain.

A simple single op amp bandpass filter is used in both the 100 and 1KHz segments prior to the NE567s. I haven't swept them using a variable oscillator and a scope, but...

I have an old (1983) Heathkit clock that synchronizes itself to the time code information broadcast by US radio station WWV (the 5, 10 & 15 MHz signals, not VLF like new consumer type clocks) that I...

The application was a rewind control on a rather elderly commercial printing press.

The original setup was a commercial PID board made up of *many* op amps. At its best it was cranky acting when...

A word of advise to anyone who needs to do PID control with a PIC, and is thinking of using this subroutine but is concerned about how well it works, you needn't worry. I used it to implement a...

The routine works like a champ!

Did the first trial run-up today. No problem at all with mono-polar operation. A few tweaks on the constants and it's working great. Need to make a small hardware...

Thanks for the reply.

Yes, makes sense to me. The process does accept a variable input, not on-off. It's a DC drive that I'm generating a reference voltage for using hardware PWM on a 18F2320 @...

I need to get a simple PID application going using a PIC, and this PID include looks to be ideal for what I need to do.

The system I'm working with doesn't incorporate an output device that...