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???
06/24/03 20:00
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#49228 - RE: Rob Redding and Michael Karas
Responding to: ???'s previous message
This is the circuit , for my amusement and testing only..
I imagine it could be improved in any number of ways (use a rail to rail opamp of the 5vdc supply etc),but as it was a slight hack of a PCB I already had ,it sufficed)..
The resistors were all 1% tolerance..
I did add a CR low pass filter to smooth the output a little(not shown)..
There is a 2.5 v offset to the output ,but another opamp stage and a dc blocking capacitor will remove this(if you go to a balanced supply)..

the offset bias supply to the opamp (non inverting) is the same as the buffer..5vdc..

R2R Ladder Diagram

List of 16 messages in thread
TopicAuthorDate
DTMF from 8052 pin            01/01/70 00:00      
   RE: DTMF from 8052 pin            01/01/70 00:00      
   RE: DTMF from 8052 pin            01/01/70 00:00      
   RE: DTMF from 8052 pin            01/01/70 00:00      
   RE:Rob Redding            01/01/70 00:00      
      RE: RE:Rob Redding            01/01/70 00:00      
         RE: Rob Redding and Michael Karas            01/01/70 00:00      
            RE: Rob Redding and Michael Karas            01/01/70 00:00      
            RE: Rob Redding and Michael Karas            01/01/70 00:00      
               RE: Rob Redding and Michael Karas            01/01/70 00:00      
                  RE: Rob Redding and Michael Karas            01/01/70 00:00      
                     RE: Rob Redding and Michael Karas            01/01/70 00:00      
      RE: RE:Rob Redding            01/01/70 00:00      
   RE: DTMF generation from ADuc812            01/01/70 00:00      
   RE: DTMF generation from ADuc812            01/01/70 00:00      
      RE: DTMF generation from ADuc812            01/01/70 00:00      

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