| ??? 08/08/02 06:14 Read: times |
#26925 - RE: Relay driver for 8051 |
*Bill of materials:
- 2 Resistor 2k2 1/4W - 1 Transistor BC557 (PNP) - 1 Transistor BC457 (PNP) - The relay and his diode. One resistor from the pin of 8051 to base of BC557. The 557: Emiter +5V, Base (explained yet), Collector trough the other R2K2 to the base of 547. 547: Emiter to Ground, Collector to Relay. Or put an inverter i.e. 7404 and then the 2003. Why active low? You can invert the signal by software before activate the port. |
| Topic | Author | Date |
| Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Felix | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver // Farooq | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 | 01/01/70 00:00 | |
| RE: Relay driver for 8051 Ijaz | 01/01/70 00:00 | |
| RE: Relay driver // Steve | 01/01/70 00:00 | |
| RE: Relay driver for 8051/ijaz | 01/01/70 00:00 | |
| RE: Relay driver // Steve/active low | 01/01/70 00:00 | |
| RE: Relay driver // Farooq | 01/01/70 00:00 | |
RE: Relay driver for 8051 | 01/01/70 00:00 |