jcranmer
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- Joined
- Mar 23, 2011
- Messages
- 2,095
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- 63
So I used to think my soldering skills were at least decent if not better then average.
Let's just say my first experience with soldering anything as tiny as a flex was a humbling experience. I had both battery leads soldered on when I noticed that I didn't get the positive lead cleanly though the hole. Rather then leaving wire stands to short something out on the board, I opted to heat the wire back up and pull it out to try again.
Of course when I did this solder filled the hole and no matter what I did I couldn't get it cleaned up enough to get the wire back though. My normal de-soldering braid was just too dang large to do any good, even when trying to trim it smaller.
In my frustration I managed to heat things up a little too much and last resistor fell off (and was quickly lost). I'm going to blame some of this on failing eyesight and shaky hands, but lets face it; I messed up and had no business attempting to solder something so tiny with my tools and skill level.
My question is two parts:
1) Does anyone know what value those resistors are? I'd like to find a replacement. I've had an offer from someone to do the soldering for me, since it's apparent I can't do it.
2) Since I'm only trying to get ~90ma out of this (Default current range), is this resistor even needed?
The documentation says that removing this resistor will lower current slightly when in ranges 2 - 4, but do not state what if anything removing it will do to the default range.
Let's just say my first experience with soldering anything as tiny as a flex was a humbling experience. I had both battery leads soldered on when I noticed that I didn't get the positive lead cleanly though the hole. Rather then leaving wire stands to short something out on the board, I opted to heat the wire back up and pull it out to try again.
Of course when I did this solder filled the hole and no matter what I did I couldn't get it cleaned up enough to get the wire back though. My normal de-soldering braid was just too dang large to do any good, even when trying to trim it smaller.
In my frustration I managed to heat things up a little too much and last resistor fell off (and was quickly lost). I'm going to blame some of this on failing eyesight and shaky hands, but lets face it; I messed up and had no business attempting to solder something so tiny with my tools and skill level.
My question is two parts:
1) Does anyone know what value those resistors are? I'd like to find a replacement. I've had an offer from someone to do the soldering for me, since it's apparent I can't do it.
2) Since I'm only trying to get ~90ma out of this (Default current range), is this resistor even needed?
The documentation says that removing this resistor will lower current slightly when in ranges 2 - 4, but do not state what if anything removing it will do to the default range.
Current Setting:
The Micro FlexDrive has five output current ranges, listed in the diagram below. Each range listed in approximate, there is variation from unit to unit so test the closest range to your desired current and work your way up or down the scale. Removing the end resistor has the effect of decreasing the output current slightly when you are in ranges 2-4. The default 65-100mA range requires no changes. The other ranges require solder jumpers as shown. To adjust and set the diver current, a load is required. A series of 3 or 4 1N4001 diodes and a 1 to 0.2 ohm resistor is recommended for use as a dummy load. Use the Voltage across the dummy load resistor to determine current. Output current is adjusted via the potentiometer trimmer. An insulated screwdriver and a light touch are recommended for adjustment.