I pulled apart a light tonight to piggyback another resistor onto the SOB1000 board in it. I don't have the thread at hand, but I definitely remember reading that soldering a resistor on top of an existing one on the SOB board was the easiest way to up the current a tad.
The board has two .10 resistors in place already. I remove the positive wire to the SOB and solder the leads from my MM in there to check current. I was getting .62 amps with the stock board. Seems low, but maybe my meter doesn't read right. No problem, it's just something to compare with. So .62 amps is my baseline.
Then I solder a .12 resistor that I bought from the Shoppe onto one of the existing .10's (R2 position). The solder job is good, no problems. Took my time and had on my magnifying glasses. I fire it back up and it checks .27 amps.
It is also noticably dimmer. I desolder the .12 off and re-check the current and it goes right back to .62.
What am I doing wrong?
Edit: I figured out why my initial reading was low. I was checking with a fully charged AW C cell (4.15 volts). I added a second cell, doubling the voltage, and the current went up to .96 amps. I then hooked it up to the 3 CR123 battereis that it runs on (12+ volts), and it was also .96 amps. Ok, good. My MM reads close, and the SOB1000 is basically 1 amp. I didn't realize that the SOB wouldn't provide full current to the Seoul P4 from a fully charged AAW C cell.
That still doesn't explain the reason why the piggybacked resistor lowered the current though.
The board has two .10 resistors in place already. I remove the positive wire to the SOB and solder the leads from my MM in there to check current. I was getting .62 amps with the stock board. Seems low, but maybe my meter doesn't read right. No problem, it's just something to compare with. So .62 amps is my baseline.
Then I solder a .12 resistor that I bought from the Shoppe onto one of the existing .10's (R2 position). The solder job is good, no problems. Took my time and had on my magnifying glasses. I fire it back up and it checks .27 amps.
It is also noticably dimmer. I desolder the .12 off and re-check the current and it goes right back to .62.What am I doing wrong?
Edit: I figured out why my initial reading was low. I was checking with a fully charged AW C cell (4.15 volts). I added a second cell, doubling the voltage, and the current went up to .96 amps. I then hooked it up to the 3 CR123 battereis that it runs on (12+ volts), and it was also .96 amps. Ok, good. My MM reads close, and the SOB1000 is basically 1 amp. I didn't realize that the SOB wouldn't provide full current to the Seoul P4 from a fully charged AAW C cell.
That still doesn't explain the reason why the piggybacked resistor lowered the current though.
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