| ??? 12/23/04 09:52 Read: times |
#83686 - DIY , Other details Responding to: ???'s previous message |
Hi Russel , Babar , Thanks for the posts. Russel : We also took apart a very low cost standalone temperature controller (<$16 one unit ). We found that there was only a single 28 pin DIP chip with no markings. This chip had NO external crystal oscillator , NO external signal conditioning for the T/C input. The T/C was connected directly to the IC and a diode used for CJC was connected to another pin ( meaning that compensation is done from the firware??). The choice of J type / K type may be done through a small keypad. The display was a 7 segment LED x 4 directly driven, with 4 transistors for individual units. Hence we were wondering which chip is being used. Something similar to : http://focus.ti.com/lit/an/slaa218/slaa218.pdf Babar : Regarding the choice of sensor the thermocouple is what is being commonly used for this, so we had to choose the same.Thanks for your feedback though. Thanks Thomas |
| Topic | Author | Date |
| Low cost controller for temperature | 01/01/70 00:00 | |
| Why a processor ? | 01/01/70 00:00 | |
| Who is Wy? | 01/01/70 00:00 | |
| Temp controller | 01/01/70 00:00 | |
| When you can buy why make ? | 01/01/70 00:00 | |
| When you can buy why make ? | 01/01/70 00:00 | |
| Can be done by Double-OPamp | 01/01/70 00:00 | |
| DIY | 01/01/70 00:00 | |
| the other details. | 01/01/70 00:00 | |
| DIY , Other details | 01/01/70 00:00 | |
| CJC | 01/01/70 00:00 | |
| CJC | 01/01/70 00:00 | |
| You haven't had a look at the link??? | 01/01/70 00:00 | |
| CJC | 01/01/70 00:00 | |
| Accuracy ? | 01/01/70 00:00 | |
Steve -accuracy | 01/01/70 00:00 |