v 20080929 1
C 47100 46200 1 0 1 nmos-3.sym
{
T 46500 46700 5 10 0 0 0 6 1
device=NMOS_TRANSISTOR
T 47000 46600 5 10 1 1 0 0 1
comment=BS170
}
C 46800 47200 1 90 0 led-3.sym
{
T 46150 48150 5 10 0 0 90 0 1
device=LED
T 46200 46000 5 10 1 1 90 0 1
comment=Many LEDs, or any other load
}
C 46400 48400 1 0 0 vcc-1.sym
C 47900 47200 1 90 0 resistor-2.sym
{
T 47550 47600 5 10 0 0 90 0 1
device=RESISTOR
T 47200 47600 5 10 1 1 0 0 1
value=100k
}
C 46700 45100 1 90 0 resistor-2.sym
{
T 46350 45500 5 10 0 0 90 0 1
device=RESISTOR
T 46200 45300 5 10 1 1 0 0 1
value=3R
}
C 47300 45200 1 0 0 npn-2.sym
{
T 47900 45700 5 10 0 0 0 0 1
device=NPN_TRANSISTOR
T 47900 45600 5 10 1 1 0 0 1
comment=BC548
}
C 46500 44500 1 0 0 gnd-1.sym
N 46600 48400 46600 48100 4
N 46600 48200 47800 48200 4
N 47800 48200 47800 48100 4
N 46600 47200 46600 47000 4
N 47800 47200 47800 46200 4
N 47100 46400 47800 46400 4
N 46600 46200 46600 46000 4
N 46600 45100 46600 44800 4
N 47800 45200 47800 45000 4
N 47800 45000 46600 45000 4
N 47300 45700 47000 45700 4
N 47000 45700 47000 46100 4
N 47000 46100 46600 46100 4
T 47000 48600 9 10 1 0 0 0 1
Concept 1
C 49100 46500 1 180 0 terminal-1.sym
{
T 48790 45750 5 10 0 0 180 0 1
device=terminal
T 48790 45900 5 10 0 0 180 0 1
footprint=CONNECTOR 1 1
T 48100 46700 5 10 1 1 0 0 1
value=Input control
}
N 48200 46400 47800 46400 4
T 45900 49000 9 10 1 0 0 0 3
Recommended components
can be replaced by ANY functionally
equivalent ones.
T 45600 44600 9 10 1 0 90 0 1
An idea by Doublehp and Whygee
C 50400 46200 1 0 1 nmos-3.sym
{
T 49800 46700 5 10 0 0 0 6 1
device=NMOS_TRANSISTOR
}
C 50100 47200 1 90 0 led-3.sym
{
T 49450 48150 5 10 0 0 90 0 1
device=LED
}
C 49700 48400 1 0 0 vcc-1.sym
C 51200 47200 1 90 0 resistor-2.sym
{
T 50850 47600 5 10 0 0 90 0 1
device=RESISTOR
T 50500 47600 5 10 1 1 0 0 1
value=100k
}
C 50000 45100 1 90 0 resistor-2.sym
{
T 49650 45500 5 10 0 0 90 0 1
device=RESISTOR
T 49500 46000 5 10 1 1 270 0 1
comment=low value R
}
C 51000 45100 1 0 0 npn-2.sym
{
T 51600 45600 5 10 0 0 0 0 1
device=NPN_TRANSISTOR
}
C 49800 44200 1 0 0 gnd-1.sym
N 49900 48400 49900 48100 4
N 49900 48200 51100 48200 4
N 51100 48200 51100 48100 4
N 49900 47200 49900 47000 4
N 51100 47200 51100 46400 4
N 50400 46400 51600 46400 4
N 49900 46200 49900 46000 4
N 49900 45100 49900 44500 4
N 51500 45100 51500 44700 4
N 51500 44700 49900 44700 4
C 52500 46500 1 180 0 terminal-1.sym
{
T 52190 45750 5 10 0 0 180 0 1
device=terminal
T 52190 45900 5 10 0 0 180 0 1
footprint=CONNECTOR 1 1
T 51400 46700 5 10 1 1 0 0 1
value=Input control
}
T 50300 48600 9 10 1 0 0 0 1
Concept 2
C 50300 46100 1 270 0 pot-bourns.sym
{
T 51200 45300 5 10 0 0 270 0 1
device=VARIABLE_RESISTOR
T 50100 46000 5 10 1 1 270 0 1
comment=high value pot
}
N 49900 46100 50400 46100 4
N 50900 45600 51000 45600 4
N 50400 45200 50400 44700 4
N 51500 46400 51500 46100 4
T 49100 43300 9 10 1 0 0 0 3
This will produce higher current
than first schematic with identical Rsens
Take care about power absorbed by Rsens !!!
C 53700 47200 1 0 1 nmos-3.sym
{
T 53100 47700 5 10 0 0 0 6 1
device=NMOS_TRANSISTOR
}
C 53000 49600 1 0 0 vcc-1.sym
C 54500 48000 1 90 0 resistor-2.sym
{
T 54150 48400 5 10 0 0 90 0 1
device=RESISTOR
T 53800 48400 5 10 1 1 0 0 1
value=100k
}
C 53300 45100 1 90 0 resistor-2.sym
{
T 52950 45500 5 10 0 0 90 0 1
device=RESISTOR
}
C 54300 45100 1 0 0 npn-2.sym
{
T 54900 45600 5 10 0 0 0 0 1
device=NPN_TRANSISTOR
}
C 53100 44200 1 0 0 gnd-1.sym
N 53200 49600 53200 49200 4
N 53200 49400 54400 49400 4
N 54400 49400 54400 48900 4
N 53200 45100 53200 44500 4
N 54800 45100 54800 44700 4
N 54800 44700 53200 44700 4
C 55700 47500 1 180 0 terminal-1.sym
{
T 55390 46750 5 10 0 0 180 0 1
device=terminal
T 55390 46900 5 10 0 0 180 0 1
footprint=CONNECTOR 1 1
T 54600 47700 5 10 1 1 0 0 1
value=Input control
}
C 53600 46100 1 270 0 pot-bourns.sym
{
T 54500 45300 5 10 0 0 270 0 1
device=VARIABLE_RESISTOR
}
N 53200 47100 53700 47100 4
N 54200 45600 54300 45600 4
N 53700 45200 53700 44700 4
N 54800 47400 54800 46100 4
T 53600 49800 9 10 1 0 0 0 1
Concept 3
T 53500 43300 9 10 1 0 0 0 5
This concept provides manual
control for reducing current
but is only applicable for LEDs
and requires one LED to be
seperated from the main branch.
C 53400 46200 1 90 0 led-3.sym
{
T 52750 47150 5 10 0 0 90 0 1
device=LED
T 52800 46200 5 10 1 1 90 0 1
comment=one LED
}
N 53700 47100 53700 46100 4
N 54400 48000 54400 47400 4
N 53700 47400 54800 47400 4
C 53400 48300 1 90 0 led-3.sym
{
T 52750 49250 5 10 0 0 90 0 1
device=LED
}
N 53200 48000 53200 48300 4
N 53200 47200 53200 47100 4
N 53200 46200 53200 46000 4
C 56900 47200 1 0 1 nmos-3.sym
{
T 56300 47700 5 10 0 0 0 6 1
device=NMOS_TRANSISTOR
}
C 56200 49600 1 0 0 vcc-1.sym
C 57700 48000 1 90 0 resistor-2.sym
{
T 57350 48400 5 10 0 0 90 0 1
device=RESISTOR
T 57000 48400 5 10 1 1 0 0 1
value=100k
}
C 56500 45100 1 90 0 resistor-2.sym
{
T 56150 45500 5 10 0 0 90 0 1
device=RESISTOR
}
C 57500 45100 1 0 0 npn-2.sym
{
T 58100 45600 5 10 0 0 0 0 1
device=NPN_TRANSISTOR
}
C 56300 44200 1 0 0 gnd-1.sym
N 56400 49600 56400 49200 4
N 56400 49400 57600 49400 4
N 57600 49400 57600 48900 4
N 56400 45100 56400 44500 4
N 58000 45100 58000 44700 4
N 58000 44700 56400 44700 4
C 58900 47500 1 180 0 terminal-1.sym
{
T 58590 46750 5 10 0 0 180 0 1
device=terminal
T 58590 46900 5 10 0 0 180 0 1
footprint=CONNECTOR 1 1
T 57800 47700 5 10 1 1 0 0 1
value=Input control
}
C 56800 46100 1 270 0 pot-bourns.sym
{
T 57700 45300 5 10 0 0 270 0 1
device=VARIABLE_RESISTOR
}
N 56400 47100 56900 47100 4
N 57400 45600 57500 45600 4
N 56900 45200 56900 44700 4
N 58000 47400 58000 46100 4
N 56900 47100 56900 46100 4
N 57600 48000 57600 47400 4
N 56900 47400 58000 47400 4
C 56600 48300 1 90 0 led-3.sym
{
T 55950 49250 5 10 0 0 90 0 1
device=LED
}
N 56400 48000 56400 48300 4
N 56400 47200 56400 47100 4
N 56400 46200 56400 46000 4
T 56800 49800 9 10 1 0 0 0 1
Concept 4
T 56700 43300 9 10 1 0 0 0 5
Untested idea.
Aims to allow to trimm current
for both increase and reduce;
May also improove
temperature stability.
C 56200 47100 1 270 0 diode-1.sym
{
T 56800 46700 5 10 0 0 270 0 1
device=DIODE
T 56100 46300 5 10 1 1 90 0 1
comment=1N4148
}