| ??? 02/15/06 10:59 Read: times |
#110025 - followups & Back EMF's? Responding to: ???'s previous message |
Kai Klaas said:
By this, voltage dropping across Pot R6 increases and more and more current of the 10mA current is flowing through it. But across R8 voltage drop remains constant, about 0.7V, so far. It is said that R7 is fixed and holds the voltage accross the o/p and adj terminal (1.24V). So by putting R7 = 120V/.25W will dissipate all power in it. If this is the case, how could Q4 (emitter pin) receive voltage to drive the major part of the 10mA current through it. Kai Klaas said:
Take care, also Q2 might need cooling! yes. Protection diodes: i could see a circuit in data sheet having protection diode (also one (D6)in the circuit i have posted) to avoid the effect of cap (connected at o/p) discharge through low current path. i would like to know how the diode nature helps to avoid this current flow. Back EMF: I have also come accross the use of diodes to prevent back EMF from coils. How does a diode help in overcoming these problems. -suresh. |
| Topic | Author | Date |
| 3A constant current source | 01/01/70 00:00 | |
| Where did you find it? | 01/01/70 00:00 | |
| Ripple | 01/01/70 00:00 | |
| plating purpose | 01/01/70 00:00 | |
| I got it from a person known to me | 01/01/70 00:00 | |
| replies | 01/01/70 00:00 | |
| plating circuit | 01/01/70 00:00 | |
| Compliance of source | 01/01/70 00:00 | |
| yes | 01/01/70 00:00 | |
| Think about that | 01/01/70 00:00 | |
| Component Purposes | 01/01/70 00:00 | |
| This circuit will never work! | 01/01/70 00:00 | |
| Could it be? | 01/01/70 00:00 | |
| Function | 01/01/70 00:00 | |
| issues | 01/01/70 00:00 | |
| plating quality control. | 01/01/70 00:00 | |
| Answers | 01/01/70 00:00 | |
| followups | 01/01/70 00:00 | |
| Answers II | 01/01/70 00:00 | |
| followups & Back EMF's? | 01/01/70 00:00 | |
Floating regulator | 01/01/70 00:00 |