wilba_mb_6582_base_pcb_construction_guide
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Last revision Both sides next revision | ||
|
wilba_mb_6582_base_pcb_construction_guide [2009/12/15 07:24] Kyo |
wilba_mb_6582_base_pcb_construction_guide [2011/01/28 13:33] m00dawg Added links to where to buy machine pin strips |
||
|---|---|---|---|
| Line 228: | Line 228: | ||
| Solder resistors R40 to R55 at time of control surface construction. This is because these resistors need to match the brightness of the LEDs you choose to use in your control surface. People who are joining bulk orders for control surface components (like LEDs) are advised to wait until they have the LEDs in their possession and can test the actual brightness of the LED with a range of resistor values (like 220 Ohms, 1k, 2k, 3k). A lot of people will get a bulk order of superbright or ultrabright LEDs from eBay which are in the 1000 to 10000 mcd range, and using 220 Ohms will put far too much current through the LEDs and they will be way too bright. Unless you want to use your control surface as a LED flashlight, you will need to increase the resistor values to decrease the current through the LEDs and thus decrease the brightness. So rather than solder 220 Ohm resistors and discover you'll need to desolder those resistors and potentially damage the pads and tracks (if it can happen to me, it can happen to you!), it is much better to experiment with one LED and some other resistor values. I discovered the hard way that the 220 Ohm resistors were way too bright with 4000 mcd blue LEDs, even when each LED was multiplexed in the matrix and only lit 1/8th the time. I eventually settled with 3k. You might find 220 Ohms works well with common 3mm LEDs of 100 mcd brightness, or 1k works well with 500 to 1000 mcd LEDs. **For the ultimate in reconfigurability, use machine pin socket strips in the pads where the R40 to R55 resistors go, so you can easily experiment with different resistor values after connecting the control surface.** | Solder resistors R40 to R55 at time of control surface construction. This is because these resistors need to match the brightness of the LEDs you choose to use in your control surface. People who are joining bulk orders for control surface components (like LEDs) are advised to wait until they have the LEDs in their possession and can test the actual brightness of the LED with a range of resistor values (like 220 Ohms, 1k, 2k, 3k). A lot of people will get a bulk order of superbright or ultrabright LEDs from eBay which are in the 1000 to 10000 mcd range, and using 220 Ohms will put far too much current through the LEDs and they will be way too bright. Unless you want to use your control surface as a LED flashlight, you will need to increase the resistor values to decrease the current through the LEDs and thus decrease the brightness. So rather than solder 220 Ohm resistors and discover you'll need to desolder those resistors and potentially damage the pads and tracks (if it can happen to me, it can happen to you!), it is much better to experiment with one LED and some other resistor values. I discovered the hard way that the 220 Ohm resistors were way too bright with 4000 mcd blue LEDs, even when each LED was multiplexed in the matrix and only lit 1/8th the time. I eventually settled with 3k. You might find 220 Ohms works well with common 3mm LEDs of 100 mcd brightness, or 1k works well with 500 to 1000 mcd LEDs. **For the ultimate in reconfigurability, use machine pin socket strips in the pads where the R40 to R55 resistors go, so you can easily experiment with different resistor values after connecting the control surface.** | ||
| - | |||
| - | |||
| ===== Capacitors C1_SIDx, C2_SIDx, C21_SIDx, C22_SIDx (SID filter capacitors) ===== | ===== Capacitors C1_SIDx, C2_SIDx, C21_SIDx, C22_SIDx (SID filter capacitors) ===== | ||
| Line 238: | Line 236: | ||
| {{mb-6582:machined_pin_socket_strip.gif}} | {{mb-6582:machined_pin_socket_strip.gif}} | ||
| + | They are available from [[http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=i-ddd7-00001003&sku=1023035|Farnell]], [[http://www.mouser.com/ProductDetail/Harwin/D01-9973242/?qs=ecHgFjcWJS%252bVNM5C80XwDA%3d%3d|Mouser]] and [[https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&productId=78642&catalogId=10001&storeId=10001|Jameco]] and likely other electronic parts stores. | ||
| ===== Electrolytic Capacitors ===== | ===== Electrolytic Capacitors ===== | ||
wilba_mb_6582_base_pcb_construction_guide.txt ยท Last modified: 2012/05/03 23:38 by wilba
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
