The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Richard Webb"
Date: Mon, 18 Nov 2002 15:04:07 -0000
NNTP-Posting-Date: 18 Nov 2002 15:02:40 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2919.6700
Richard Webb wrote:
> also check that the frequency response you require can be accomodated
> by the digital pot. I seem to remember that digital pots don't have a
> particularly high frequency range (most seem to operate in the audio
> frequency range).
> "Ban" wrote in message
>> Ian Sheevan wrote:
>>> There is a 22k ohm potentiometer,
>>> [specification: min. round preset, horiz]
>>> that i would like to replace with a
>>> digital potentiometer.
>>> My problem is that i can't figure out most Dallas
>>> IC pins that exactly resembles the 3 pin potentiometer.
>>> I would appreciate if presented with an IC
>>> that i can replace the potentiometer exactly with
>>> a digital potentiometer to control the resistance
>>> higher or lower.
>>> Thank You.
>> first you have to make sure, if the voltage range of the pot matches
>> your circuit voltages (i.e. 0 to +11V). Then you have to consider
>> that there is an additional wiper resistance, which might be 10% of
>> the end value. The 3 terminals are called:
>> Rh= most positive point
>> Wiper= variable point
>> Rl= lowest voltage point
>> Then there is a digital control via specified bus, not just up/down.
>> There might be other pots, but the Dallas ones are like this.
>> To replace the analog pot you need to know and understand some
>> circuit design.
>> ciao Ban
>> electronic hardware designer
Ooops. Please excuse the top post. I never realised people found it a
problem until I just read the NG etiquette thread above. I've installed
QuoteFix now. But why oh why doesn't OE let you do this!
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup