Yes, I was breadboarding the circuit. Out of curiosity, I measured the capacitance between adjacent terminals and found from 5 to 7 pf of capacitance. I guess I'll have to make a demonstration circuit for myself on a PCB. Hey, I could use both the MM74HC4046 and LMC555 in the same circuit, using the LMC555 as the timebase!
I don't recall that there's anything wrong with tying the VCOin pin to Vcc as a convenient way to generate the max. VCOout, it's just that the response is only linear .9V to 1.1V from each rail. My chip is a National MM74HC4046N. Brad ----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Wednesday, August 11, 2004 1:00 PM > I think, it's not allowed to just tie the vco input pin logical "high" > (Vcc). > Use some other (lower) voltage (e. g. Vcc/2). > The vco has its input voltage range, and that doesn't go from rail to rail. > I don't know, what will happen if the input is beyond its limits, but this > could be the problem. > And which manufacturer is the chip from? > > Steffen Maisch > > -- > Author: Steffen Maisch > INET: [EMAIL PROTECTED] > > Fat City Hosting, San Diego, California -- http://www.fatcity.com > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Author: Brad O'Dell INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
