![]() The motor stall current can be significant - anywhere from several hundred mA all the way to to several Amps.īecause the servo is lightly loaded, you can probably get away with a really simple linear regulator. do you see any flaw in this)?Īlthough I haven't used the SG90 servo, most RC servos want to see about 6 Vdc with significant current capability.Įven though the servo might be lightly loaded, you still have to get the motor spinning everytime the servo begins to move. I guess I could even go up to 200 mA if I work around the circuit a bit more, however, before going on I ask myself and you, is this circuit able to handle such high current loads such a servo motor (i.e. See the schematics below.īy using this circuit I should be able to output 100 mA while keeping the heat dissipation of the 2N3904 NPN within the admissible range of max 0.5 W. Since my main PS is a 12 V battery I thought I could step down the voltage using some resistors and then use an op amp (LM741) and a NPN transistor (2N3904) to set voltage and current, respectively. There should not be any "stuck" positions. Furthermore the servo does not do any "heavy lifting" it just rotates a small aluminium bar which is super light. This figure is nothing I know, but it's a start at least. However I know that my USB port can barely handle Arduino with some sensor and a servo moving around so I guess it could easily be 100 mA. The datasheet of the servo does not mention any current draw (max, min, average, etc. I could easily use a 5V battery but why bother? :) Aside from this not funny joke, I'd like to put to good use my little knowledge of electronics gained at University. I need to power a small SG90 servo motor.
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