| ??? 06/24/03 20:00 Read: times |
#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.. ![]() |
| Topic | Author | Date |
| 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 |




