| ??? 06/16/07 11:41 Read: times |
#140885 - Sprinkle as many caps as possible... Responding to: ???'s previous message |
Adding a 100uF cap right beside (connected to +5V and GND) the LCD solves this problem. Placing caps close to the devices is a good method! Placing many electrolytic (bulk) capacitors around the pcb instead of one large capacitor is better, this method will lower the power supply trace impedences. For example I normally place many 100uF electrolytic capacitors close to the various devices (in addtion to the standard 100nF ceramics.)instead of say one large 470uF cap which will obviously be away from the devices. However I cannot get approval to use this mod. Why? I am surprised. I just completed a product where I switch a 3HP single phase motor through a relay from a microcontoller port pin, so far the whole setup is running reliably without any resets due to spike etc. As others suggested you must pay great attention to detail when designing your power supply,this is the heart of any microcontroller based system. Regards, John. |
| Topic | Author | Date |
| Under/Over Voltage Protection | 01/01/70 00:00 | |
| How Big a Motor | 01/01/70 00:00 | |
| Transients | 01/01/70 00:00 | |
| never thought of that, but worth emphasizing | 01/01/70 00:00 | |
| Crikey! | 01/01/70 00:00 | |
| carve this into stone | 01/01/70 00:00 | |
| Only, if you buy the cheapest ones... | 01/01/70 00:00 | |
| i've heard | 01/01/70 00:00 | |
| voltage dips | 01/01/70 00:00 | |
| I doubt it | 01/01/70 00:00 | |
| power dips and spikes | 01/01/70 00:00 | |
| Dippy | 01/01/70 00:00 | |
| How long lasts the mains dip? | 01/01/70 00:00 | |
| mains dip | 01/01/70 00:00 | |
Sprinkle as many caps as possible... | 01/01/70 00:00 |