| ??? 05/01/09 14:49 Read: times |
#164990 - Michael circuit is fine with some diff values. Responding to: ???'s previous message |
Replace Q2,Q3 with your TIP darlington.
Use 1k0 for R3 Use 8k2 for R4 I have not read the hFE for your TIP, but at a guess it will be ~10000 so will easily saturate with less than 1mA base current. Do not dream of 2N3055s. They have a minimum hFE of about 20. And fairly high leakage currents. David. |
| Topic | Author | Date |
| Driving TIP120 from 8052 | 01/01/70 00:00 | |
| It is the Current | 01/01/70 00:00 | |
| Use this type circuit | 01/01/70 00:00 | |
| Thanks, I'll give it a try | 01/01/70 00:00 | |
| 0.1A | 01/01/70 00:00 | |
| Michael circuit is fine with some diff values. | 01/01/70 00:00 | |
| Success! | 01/01/70 00:00 | |
You use a Darlington, ... | 01/01/70 00:00 | |
| Check values | 01/01/70 00:00 | |
| is Q2 not a bit overkill? | 01/01/70 00:00 | |
| Base current and transistor beta | 01/01/70 00:00 | |
| logic level MOSFET | 01/01/70 00:00 | |
| they do make p-channel logic mosfets | 01/01/70 00:00 |