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x0x:sequencerfabrication [2016/01/28 18:05] (current)
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 +===== Building the Sequencer =====
 +{{template>​.templates:​fabinfo|difficulty=?​|components=219|resistors=71|capacitors=14|diodes=10,​ 40 LEDs|transistors=1|ics=11|other=DummyEntry\\
 +1 40 Pin DIP Socket\\
 +1 x 8 Pin DIP Socket\\
 +1 x Rotary Encoder\\
 +2 x 16 Position Rotary Switches\\
 +2 x Jumpers\\
 +2 x '​straps'​\\
 +23 x Tact Switches\\
 +40 x Standoffs\\
 +1 x 16MHz Ceramic Resonator}}
 +This section is not particularly difficult, but it is long.  There are a lot of resistors, leds and switches. ​ Also, be sure to put your eprom and MicroProcessor in **after** you finish soldering. ​ Don't forget about the 2 Jumpers J1 and J2.  They are not the wires to staple the rotary switches.
 +Take some time to figure out in which order you are going to want to solder this section in.  It might be a good idea to start with the resistors, LEDs, and then the switches. ​ The idea is to not melt the switches. ​ Some of the resistors get pretty tight in here, so make sure you don't have any shorts.
 +==== LEDs and Standoffs ====
 +The LEDs have polarity. ​ You might have some problems putting the [[LEDs]] through the standoffs. ​ If this is the case, just use something to poke thorough the holes. ​ The standoffs are used to raise the [[LEDs]] higher, and keep them in place. ​ When stuffing the [[LEDs]], it is a good idea to kink the leads while pressing down firmly on the rounded part of the LED.
 +If you look closely, one side of the LED is flat (this is also the side with shorter leg and the side that has the triangular '​cup'​). Make sure the negative side inserted in the hole closest to the flat side of the LED graphic on the board.
 +One idea you can pinch from the forums (thanks, [[http://​​forums/​viewtopic.php?​t=2821&​highlight=leds|Numbernone]]) to make stuffing the [[LEDs]] less of a pain is to use the front panel as a template for holding it all together. Stuff all the [[LEDs]] in place, and slip the front panel over them. Use a bit of decorator'​s tape to temporarily strap the circuit board to the front panel, flip it over and start soldering. ​
 +==== The Rotary Switches ====
 +You are going to want to take your time with the 5 pin rotary switches. ​ '​staple'​ them in pace with wire first, and make sure they are centered on the silkscreen before soldering them in.  If you don't you are going to have a hard time putting the faceplate on later when you [[FinishingOff| Finish Off]]
 +==== The Tact Switches ====
 +The tact switches do not have any polarity, despite the fact that there are pinouts on the silkscreen. ​ They can be soldered in any way you like, but make sure that they are soldered in flush with the board or you will have problems with mounting the faceplate.
 +==== Mistakes to avoid ====
 +**equaliser says...** Rather obvious this, but I got my Q5 transistor in the wrong way round. This meant that the mode switch had no effect, and all the black keys didn't work. 
/home/ladyada/public_html/wiki/data/pages/x0x/sequencerfabrication.txt · Last modified: 2016/01/28 18:05 (external edit)