UoN / SACAMOS

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GUI/SW2/SRC/sch/led-drv/led-flasher.sch 5 KB
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886c558b   Steve Greedy   SACAMOS Public Re... 
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v 20110115 2
C 3100 86500 1 0 1 npn-3.sym
{
T 2200 86900 5 10 1 1 0 6 1
refdes=Q1
T 1700 86600 5 10 1 1 0 0 1
value=BC548
}
C 5400 87450 1 270 0 resistor-2.sym
{
T 5100 87050 5 10 1 1 0 0 1
refdes=R3
T 5400 86950 5 10 1 1 180 0 1
value=100K
}
C 5400 88850 1 270 0 resistor-2.sym
{
T 5100 88500 5 10 1 1 0 0 1
refdes=R1
T 5400 88400 5 10 1 1 180 0 1
value=100K
}
C 4100 87450 1 270 0 resistor-2.sym
{
T 4400 87050 5 10 1 1 0 0 1
refdes=R2
T 4850 86950 5 10 1 1 180 0 1
value=470K
}
C 4300 87450 1 0 0 capacitor-1.sym
{
T 4400 87750 5 10 1 1 0 0 1
refdes=C2
T 4900 87750 5 10 1 1 0 0 1
value=220p
}
C 1400 89500 1 270 0 capacitor-1.sym
{
T 1300 89200 5 10 1 1 0 0 1
refdes=C1
T 1500 88900 5 10 1 1 180 0 1
value=10u
}
N 10600 86400 1000 86400 4
C 6200 87300 1 270 0 led-1.sym
{
T 5900 86750 5 10 1 1 0 0 1
refdes=D6
T 6300 86500 5 10 1 1 0 6 1
value=LED
}
C 6200 88200 1 270 0 led-1.sym
{
T 5900 87650 5 10 1 1 0 0 1
refdes=D5
T 6300 87400 5 10 1 1 0 6 1
value=LED
}
C 6200 89100 1 270 0 led-1.sym
{
T 5900 88550 5 10 1 1 0 0 1
refdes=D4
T 6300 88300 5 10 1 1 0 6 1
value=LED
}
C 5500 88900 1 0 0 diode-1.sym
{
T 5850 89350 5 10 1 1 0 0 1
refdes=D3
T 6200 89200 5 10 1 1 0 0 1
value=1N914
}
N 5500 89100 5500 88850 4
N 5500 87950 5500 87450 4
C 4100 88150 1 180 0 pnp-3.sym
{
T 3250 87850 5 10 1 1 180 0 1
refdes=Q2
T 2800 88100 5 10 1 1 180 6 1
value=BC558
}
N 3500 87000 3500 87150 4
N 4100 87650 4300 87650 4
N 4200 87650 4200 87450 4
N 5200 87650 5500 87650 4
N 2500 86500 2500 86400 4
N 3500 88150 3500 89600 4
N 7900 87500 7200 87500 4
N 5500 89100 3050 89100 4
N 3050 89100 3050 88650 4
N 3050 88650 2500 88650 4
C 2400 89600 1 270 0 inductor-1.sym
{
T 2200 89250 5 10 1 1 0 0 1
refdes=L1
T 2450 89100 5 10 1 1 180 0 1
value=0.3m
}
N 2500 88700 2500 87500 4
N 1000 89600 10600 89600 4
C 1600 87650 1 0 0 diode-1.sym
{
T 2000 88100 5 10 1 1 0 0 1
refdes=D1
T 1800 87450 5 10 1 1 0 0 1
value=1N914
}
N 1600 88600 1600 86400 4
N 1600 89600 1600 89500 4
C 800 87700 1 270 0 battery-3.sym
{
T 250 87200 5 10 1 1 0 0 1
refdes=Vbatt
T 300 86900 5 10 1 1 0 0 1
value=3.0V
}
C 1100 87750 1 90 0 resistor-2.sym
{
T 850 88400 5 10 1 1 180 0 1
refdes=Rbatt
T 500 88050 5 10 1 1 0 0 1
value=1.0
}
N 1000 89600 1000 88650 4
N 1000 87750 1000 87700 4
N 1000 86600 1000 86400 4
C 2650 86100 1 0 0 gnd-1.sym
T 5100 90250 9 18 1 0 0 0 1
LED  Flasher
C 300 85050 1 0 0 spice-model-1.sym
{
T 400 85650 5 10 1 1 0 0 1
refdes=A1
T 1600 85350 5 10 1 1 0 0 1
model-name=BC548
T 800 85150 5 10 1 1 0 0 1
file=../../lib/bjt/bc548.mod
}
C 300 84100 1 0 0 spice-model-1.sym
{
T 400 84700 5 10 1 1 0 0 1
refdes=A2
T 1600 84400 5 10 1 1 0 0 1
model-name=BC558
T 800 84200 5 10 1 1 0 0 1
file=../../lib/bjt/bc558.mod
}
C 3300 85050 1 0 0 spice-model-1.sym
{
T 3400 85650 5 10 1 1 0 0 1
refdes=A3
T 4600 85350 5 10 1 1 0 0 1
model-name=1N914
T 3800 85150 5 10 1 1 0 0 1
file=../../lib/diode/1n914.mod
}
C 3300 84100 1 0 0 spice-model-1.sym
{
T 3400 84700 5 10 1 1 0 0 1
refdes=A4
T 4600 84400 5 10 1 1 0 0 1
model-name=LED
T 3800 84200 5 10 1 1 0 0 1
file=../../lib/diode/led.mod
}
C 7800 89300 1 270 0 resistor-2.sym
{
T 8100 88900 5 10 1 1 0 0 1
refdes=R4
T 8450 88800 5 10 1 1 180 0 1
value=22K
}
C 10500 89300 1 270 0 resistor-2.sym
{
T 10800 88900 5 10 1 1 0 0 1
refdes=R7
T 11150 88800 5 10 1 1 180 0 1
value=22K
}
C 7900 87700 1 0 0 capacitor-1.sym
{
T 8250 88100 5 10 1 1 180 0 1
refdes=C3
T 8500 87950 5 10 1 1 0 0 1
value=1n
}
N 7900 88400 7900 87500 4
N 8800 87000 9700 87900 4
N 9700 87000 8800 87900 4
N 10600 88400 10600 87500 4
C 9700 87700 1 0 0 capacitor-1.sym
{
T 10050 88100 5 10 1 1 180 0 1
refdes=C4
T 10450 88100 5 10 1 1 180 0 1
value=1n
}
C 8700 89300 1 270 0 resistor-2.sym
{
T 9000 88900 5 10 1 1 0 0 1
refdes=R5
T 9450 88800 5 10 1 1 180 0 1
value=470K
}
C 9600 89300 1 270 0 resistor-2.sym
{
T 9900 88900 5 10 1 1 0 0 1
refdes=R6
T 10350 88800 5 10 1 1 180 0 1
value=470K
}
N 8500 87000 8800 87000 4
N 9700 87000 10000 87000 4
N 9700 88400 9700 87900 4
N 8800 88400 8800 87900 4
N 7900 86500 7900 86400 4
N 10600 86400 10600 86500 4
C 8500 86500 1 0 1 npn-3.sym
{
T 8700 86750 5 10 1 1 0 6 1
refdes=Q3
T 8200 86500 5 10 1 1 0 0 1
value=BC548
}
C 10000 86500 1 0 0 npn-3.sym
{
T 9850 86750 5 10 1 1 0 0 1
refdes=Q4
T 10300 86500 5 10 1 1 0 6 1
value=BC548
}
N 7900 89300 7900 89600 4
N 8800 89300 8800 89600 4
N 9700 89300 9700 89600 4
N 10600 89300 10600 89600 4
N 3100 87000 3500 87000 4
N 5500 86550 5500 86400 4
N 4200 86550 4200 86150 4
N 4200 86150 7200 86150 4
N 7200 86150 7200 87500 4
T 6500 85700 9 10 1 0 0 0 1
NOTES :
T 6750 85450 9 10 1 0 0 0 1
*  Use a 200-300mA fuse in series with battery
T 6750 85200 9 10 1 0 0 0 1
*  Astable period 700-800ms @ 470K & 1uF
T 6750 84950 9 10 1 0 0 0 1
*  Aim for LED current of 20mA
T 6750 84700 9 10 1 0 0 0 1
*  Voltage divider R1 & R3 will effect brightness
T 6750 84450 9 10 1 0 0 0 1
*  R2 must not bias Q2 on or LED driver wont oscillate
T 6750 84200 9 10 1 0 0 0 1
*  LED driver period 40usec (20kHz)
T 6750 83950 9 10 1 0 0 0 1
*  Probably need diode to protect Q2 BE junction but astable stops oscillating
T 4750 89950 9 10 1 0 0 0 1
(Last updated on 12/11/2004)