Timeline for TIP120 Transistor + Solenoid Failing Randomly
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 5, 2019 at 15:16 | comment | added | James G-J | Thank you for all the advice, Sunnyskyguy. I plan on getting proper PCBs made for the final installation of this system (which will include more than 10x the number of solenoids) - however I was crunched for time when installing this smaller test version and so I went with what I knew, perfboard. I appreciate your help! | |
| May 5, 2019 at 15:05 | comment | added | D.A.S. | Also in future make a PCB and find a cheap board shop for $50 prototypes. Consider all wire output inductance to reduce stray coupling from input to output. Put a snubber RF cap on CLK & data to avoid false data if necessary 100 pF... or use twisted pairs. CM clamp choke on solenoid wire bundle reduces noise > 1MHz if necessary. | |
| May 5, 2019 at 14:46 | comment | added | James G-J | Great, thank you for the insight! Unfortunately, I'm away from the hardware and will not be able to make these changes for another week - once I return I will try this and be able to accept your answer, I appreciate your patience. | |
| May 5, 2019 at 14:39 | comment | added | D.A.S. | 0.1 ceramic near each CMOS IC. 10uF to 100uF Tantalum or low ESR Alum cap near 12V input such that the 5V logic ground does not share ground current from solenoids | |
| May 5, 2019 at 14:29 | comment | added | James G-J | Thanks for the response. I do have all grounds tied together on the board (I think). Could you please be more clear as to where these e-caps should be added, and perhaps an estimate to their value? | |
| May 5, 2019 at 14:22 | history | answered | D.A.S. | CC BY-SA 4.0 |