| Kai Klaas 03/02/06 10:03 Modified: 03/02/06 10:54 Read: 1246 times Germany |
#111081 - Enhanced debouncing Responding to: Suresh R's previous message |
Suresh said:
eg : if i set the delay as .5sec or less (BC550 will do its job only for this time) and pressing the switch continuously for 1 sec. will it not cause any abnormality or a repeat in cycle? If very short monoflop pulses are to be selected, then it's better to have two independent time constants, for the debouncing of switch and the performing of trigger puls. Try this circuit: 
This circuit produces highly stable pulses in the range of 5msec...10sec. Use a multiturn version for the 2M2 pot, though, and/or put a 100k pot in series to the 2M2 pot, for the fine tuning. Information about debouncing can be found here: http://www.8052.com/forum/read.phtml?id=57836 and here: http://www.8052.com/forum/read.phtml?id=57919 Kai |
| Topic | Author | Date |
| Pressing 555 trigger SW continuously. | Suresh R | 02/24/06 03:57 |
| Again | Andy Neil | 02/24/06 04:38 |
| capacitor couple it. | Steve M. Taylor | 02/24/06 10:34 |
| Re: cap coupling | Suresh R | 02/24/06 23:37 |
| Look up the internal block diagram | Kalpak Dabir | 02/24/06 23:51 |
| Read the Data Sheet!! | Andy Neil | 02/25/06 03:17 |
| got the o/p | Suresh R | 02/25/06 03:59 |
| Satisfaction | Steve M. Taylor | 02/25/06 04:08 |
| Thanku steve | Suresh R | 02/25/06 04:33 |
| Not enough | Kai Klaas | 02/25/06 07:33 |
| alternatives ? | Suresh R | 02/26/06 22:01 |
| Remedy | Kai Klaas | 02/27/06 19:16 |
| remedy? | Andy Neil | 02/28/06 01:04 |
| Alternatives | Kai Klaas | 02/28/06 06:56 |
| BC550 & diodes | Suresh R | 02/28/06 04:34 |
| Try it by yourself, it's simple! | Kai Klaas | 02/28/06 06:47 |
| analysis results | Suresh R | 03/01/06 03:37 |
| Analysis | Kai Klaas | 03/01/06 20:14 |
| Thank you | Suresh R | 03/01/06 23:10 |
| after the set delay Time | Suresh R | 03/02/06 02:07 |
| Enhanced debouncing | Kai Klaas | 03/02/06 10:03 |
| What do you think about it, Suresh? | Kai Klaas | 03/06/06 17:55 |
| why the neqw thread | Erik Malund | 02/24/06 10:55 |
| reply | Suresh R | 02/24/06 23:20 |
| Read the Data Sheet!! | Andy Neil | 02/25/06 03:16 |
| kalpak dabir | Satish S Munot | 02/25/06 00:52 |
| Have you considered using a 74121? | Richard Erlacher | 03/04/06 15:18 |
| 74121 versus CMOS555 | Kai Klaas | 03/05/06 06:53 |
| 74121 fine for short period delays? | Suresh R | 03/07/06 06:03 |
| No debounce needed??? | Kai Klaas | 03/07/06 06:33 |
| Schmitt trigger operation? | Suresh R | 03/08/06 05:41 |
| Transition times of input signal | Kai Klaas | 03/08/06 09:21 |
| controlling noise related issues | Suresh R | 03/11/06 04:08 |
| Schmitt-trigger operation | Kai Klaas | 03/11/06 06:48 |
| CD 4541BC = Alternative for ICM 7555? | Suresh R | 03/22/06 04:52 |
| Do you really need to build it? | Kai Klaas | 03/23/06 06:40 |
| Yes. | Suresh R | 03/23/06 08:38 |
| try try try again | Steve M. Taylor | 03/23/06 09:22 |
a sign of confidence | Suresh R | 03/23/06 09:59 |