| ??? 12/09/07 23:56 Read: times |
#148016 - Current, not voltage Responding to: ???'s previous message |
Esko Ilola said:
The solenoids I have met require a high voltage activation pulse and have a MUCH lower hold voltage (read power). Actually, it's a high current that's required for activation, followed by a much lower "holding" current (yes, that does still read power in the end!) As Steve says, you can do this quite easily with a capacitor discharge for the high "pull-in" pulse, and a resistor to give the lower "holding" current. Or you can buy chips that do all this and more with logic-level control... |
| Topic | Author | Date |
| Looking for a one of six selector chip | 01/01/70 00:00 | |
| HMM | 01/01/70 00:00 | |
| sounds like you need a PAL | 01/01/70 00:00 | |
| have you looked at 74HC237 with a 1 Hz clock? | 01/01/70 00:00 | |
| Oh-Oh-Use-Mcu | 01/01/70 00:00 | |
| Driving is easy. | 01/01/70 00:00 | |
| It is dead easy but ... | 01/01/70 00:00 | |
| Current, not voltage | 01/01/70 00:00 | |
| Practise and Theory | 01/01/70 00:00 | |
| I decided to settle for the MCU | 01/01/70 00:00 | |
| Memory relays and reset problems | 01/01/70 00:00 | |
| So ... you\'re using a latching relay? | 01/01/70 00:00 | |
| Example of a solenoid driver | 01/01/70 00:00 | |
| chip driver | 01/01/70 00:00 | |
| Yes, that's the kind of thing | 01/01/70 00:00 | |
| No, voltage, not current! | 01/01/70 00:00 | |
| AC solenoids | 01/01/70 00:00 | |
| Thread morphing... | 01/01/70 00:00 | |
PLC | 01/01/70 00:00 | |
| trivial, maybe, but why not use a 'trivial' uC | 01/01/70 00:00 | |
| Trivial microcontrollers | 01/01/70 00:00 |