| ??? 03/14/05 15:54 Read: times |
#89643 - History Responding to: ???'s previous message |
Joseph Hebert said:
These circuits were the Flip-Flops of the analog computer. They are called Op Amps because they are designed to carry out mathematical operations. They can produce the sum or difference of two inputs. They can also produce the integral or derivative of an input (hence the "I" and "D" in "PID). Yes, they are still popular in applications of instrumentation and process control, but in the time before digital gates and ยต-controllers, these were the only technology available.
In the interests of accuracy I think the last sentence is not strictly correct. I remember using some of the very first 709 op amps in the early 70s and at that time the Fairchild 9000 series DTL chips were commonly available. Ian |
| Topic | Author | Date |
| [OT] Understanding Op-Amp specs.. | 01/01/70 00:00 | |
| Not as off topic as one might think | 01/01/70 00:00 | |
| not so fast.... | 01/01/70 00:00 | |
| History | 01/01/70 00:00 | |
| In the interests of accuracy I think the | 01/01/70 00:00 | |
| Memories | 01/01/70 00:00 | |
| Op Amps | 01/01/70 00:00 | |
| valves and tubes | 01/01/70 00:00 | |
| uC-less Mass Spec | 01/01/70 00:00 | |
| digital and analog. | 01/01/70 00:00 | |
| Field conditions | 01/01/70 00:00 | |
| the field | 01/01/70 00:00 | |
Field Servicability | 01/01/70 00:00 | |
| we actually made such a beast | 01/01/70 00:00 |