fading LED - nearly there

[[email protected]]

Trying to do a "simple" fade in and fade out of LED as I switch it on
and off.

So far I have the LED working with a 9V supply, a 1000uF Cap, LED and
small resistor(adjusts fade time) across cap and a resistor before the
lot on the + to time the illumination. I am using variable resistors at
the moment to fine tune the timing. Simple enough(?)

I have since discovered that if the power is not switched off cleanly
the cap discharges and the LED just goes off. Clever me thought
"simple, I'll debounce it" but now the circuit gets more complex as I
need the full 9 volts for the LED circuit so I can't use the IC(used to
debounce) output to power the LED.

So here are my questions.

Can the 74ls00 run directly off the 9v supply?

I obviously need a transistor setup on the output to switch on the 9v
to LED circuit but what sort? Should the be a resistor pulling the base
high or low when not getting a + output?

and lastly

How do I wire up the debouncer with an on/off switch? I tried a simple
setup with 2 NAND gates with outputs looped back to each other but no
end of probing with inputs helped me turn it on and off. A simple
circuit diagram would be great, everything I seem to find is a
tutorial.

Any help appreciated

Regards
Macros

 

[John Fields]

Trying to do a "simple" fade in and fade out of LED as I switch it on
and off.

....


A simple
circuit diagram would be great, everything I seem to find is a
tutorial.

---
View in Courier:


+9V>---[1N4148>]-----+--------+--[100R]--+
| | |
[1KR] | |
| C |
+------B 2N3904 |+
| E [1000µF]
| | |
|+ [300R] |
[1000µF] | |
| [LED] |
| |K |
GND>-----------------+--------+----------+


LTSPICE schematic list:

Version 4
SHEET 1 880 680
WIRE -64 16 -224 16
WIRE 64 16 -64 16
WIRE 96 16 64 16
WIRE 208 16 176 16
WIRE -64 80 -64 16
WIRE 64 160 64 16
WIRE 208 160 208 16
WIRE -64 208 -64 160
WIRE 0 208 -64 208
WIRE -224 304 -224 16
WIRE 64 304 64 256
WIRE -224 432 -224 368
WIRE -64 432 -64 208
WIRE 64 432 64 384
WIRE -224 560 -224 512
WIRE -64 560 -64 496
WIRE -64 560 -224 560
WIRE 64 560 64 496
WIRE 64 560 -64 560
WIRE 208 560 208 224
WIRE 208 560 64 560
WIRE -224 608 -224 560
FLAG -224 608 0
SYMBOL npn 0 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL cap -80 432 R0
WINDOW 0 -45 30 Left 0
WINDOW 3 -78 62 Left 0
SYMATTR InstName C1
SYMATTR Value 1000e-6
SYMBOL voltage -224 416 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 9 0 1e-3 1e-3 5 10)
SYMBOL res -80 64 R0
WINDOW 0 -53 40 Left 0
WINDOW 3 -65 70 Left 0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL res 80 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 300
SYMBOL diode -208 368 R180
WINDOW 0 50 33 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL cap 192 160 R0
WINDOW 0 51 30 Left 0
WINDOW 3 28 62 Left 0
SYMATTR InstName C2
SYMATTR Value 1000e-6
SYMBOL LED 48 432 R0
SYMATTR InstName D4
SYMBOL res 80 32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 100
TEXT -202 584 Left 0 !.tran 20

 

[[email protected]]

aHH a nice simple schematic to answer everything, Thanks John. Couldn't
help noticing the lack of gates for debouncing, this looks much
simpler.

Shall put it together tonight and see how it goes, shall need to change
atleast the 300R as the super bright blue led I am using needs only 100
or less.

One more thing, what exactly is ltspice? and is it downloadable? Could
I instal it and use the list you posted with the schematic to recreate
in ltspice?

Thanks again John, been looking thru' some old posts and constantly
come across you helping people, well done and thank you.

Macros

 

[[email protected]]

+9V>---[1N4148>]-----+--------+--[100R]--+
| | |
[1KR] | |
| C |
+------B 2N3904 |+
| E [1000µF]
| | |
|+ [300R] |
[1000µF] | |
| [LED] |
| |K |
GND>-----------------+--------+----------+

Hi John, I made the circuit as described and then tweaked a few things
and altho' it is now fading out beautifully it does not illuminate
slowly.

I have changed to 220uF caps as they are better for the timing and
replaced some of the caps with pots to set the timing. The 100R
replaced with a pot adjusts the fade time perfectly. Adjusting the 1KR
doesn't seem to do anything noticable and the cap between base and
ground seems to only add to the fade time, putting it in only added to
the fade time.

Any further help would be great, most enjoyable playing around with
some electronics again

Macros

 

[[email protected]]

oops 100uF caps not 220

+9V>---[1N4148>]-----+--------+--[100R]--+
| | |
[1KR] | |
| C |
+------B 2N3904 |+
| E [1000µF]
| | |
|+ [300R] |
[1000µF] | |
| [LED] |
| |K |
GND>-----------------+--------+----------+

Hi John, I made the circuit as described and then tweaked a few things
and altho' it is now fading out beautifully it does not illuminate
slowly.

I have changed to 220uF caps as they are better for the timing and
replaced some of the caps with pots to set the timing. The 100R
replaced with a pot adjusts the fade time perfectly. Adjusting the 1KR
doesn't seem to do anything noticable and the cap between base and
ground seems to only add to the fade time, putting it in only added to
the fade time.

Any further help would be great, most enjoyable playing around with
some electronics again

Macros

LTSPICE schematic list:

Version 4
SHEET 1 880 680
WIRE -64 16 -224 16
WIRE 64 16 -64 16
WIRE 96 16 64 16
WIRE 208 16 176 16
WIRE -64 80 -64 16
WIRE 64 160 64 16
WIRE 208 160 208 16
WIRE -64 208 -64 160
WIRE 0 208 -64 208
WIRE -224 304 -224 16
WIRE 64 304 64 256
WIRE -224 432 -224 368
WIRE -64 432 -64 208
WIRE 64 432 64 384
WIRE -224 560 -224 512
WIRE -64 560 -64 496
WIRE -64 560 -224 560
WIRE 64 560 64 496
WIRE 64 560 -64 560
WIRE 208 560 208 224
WIRE 208 560 64 560
WIRE -224 608 -224 560
FLAG -224 608 0
SYMBOL npn 0 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL cap -80 432 R0
WINDOW 0 -45 30 Left 0
WINDOW 3 -78 62 Left 0
SYMATTR InstName C1
SYMATTR Value 1000e-6
SYMBOL voltage -224 416 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 9 0 1e-3 1e-3 5 10)
SYMBOL res -80 64 R0
WINDOW 0 -53 40 Left 0
WINDOW 3 -65 70 Left 0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL res 80 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 300
SYMBOL diode -208 368 R180
WINDOW 0 50 33 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL cap 192 160 R0
WINDOW 0 51 30 Left 0
WINDOW 3 28 62 Left 0
SYMATTR InstName C2
SYMATTR Value 1000e-6
SYMBOL LED 48 432 R0
SYMATTR InstName D4
SYMBOL res 80 32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 100
TEXT -202 584 Left 0 !.tran 20

 

[John Fields]

aHH a nice simple schematic to answer everything, Thanks John. Couldn't
help noticing the lack of gates for debouncing, this looks much
simpler.

Shall put it together tonight and see how it goes, shall need to change
atleast the 300R as the super bright blue led I am using needs only 100
or less.

One more thing, what exactly is ltspice? and is it downloadable? Could
I instal it and use the list you posted with the schematic to recreate
in ltspice?

---
Yes to all. It's at:

http://www.linear.com/designtools/softwareRegistration.jsp

and it's free.
---

Thanks again John, been looking thru' some old posts and constantly
come across you helping people, well done and thank you.

---
You're welcome, my pleasure.

One small thing, if you don't mind; please bottom post or, inline
post if it's appropriate.

Thanks,

 

[[email protected]]

oops 100uF caps not 220

+9V>---[1N4148>]-----+--------+--[100R]--+
| | |
[1KR] | |
| C |
+------B 2N3904 |+
| E [1000µF]
| | |
|+ [300R] |
[1000µF] | |
| [LED] |
| |K |
GND>-----------------+--------+----------+

Hi John, I made the circuit as described and then tweaked a few things
and altho' it is now fading out beautifully it does not illuminate
slowly.

I have changed to 220uF caps as they are better for the timing and
replaced some of the caps with pots to set the timing. The 100R
replaced with a pot adjusts the fade time perfectly. Adjusting the 1KR
doesn't seem to do anything noticable and the cap between base and
ground seems to only add to the fade time, putting it in only added to
the fade time.

Any further help would be great, most enjoyable playing around with
some electronics again

Macros

LTSPICE schematic list:

Version 4
SHEET 1 880 680
WIRE -64 16 -224 16
WIRE 64 16 -64 16
WIRE 96 16 64 16
WIRE 208 16 176 16
WIRE -64 80 -64 16
WIRE 64 160 64 16
WIRE 208 160 208 16
WIRE -64 208 -64 160
WIRE 0 208 -64 208
WIRE -224 304 -224 16
WIRE 64 304 64 256
WIRE -224 432 -224 368
WIRE -64 432 -64 208
WIRE 64 432 64 384
WIRE -224 560 -224 512
WIRE -64 560 -64 496
WIRE -64 560 -224 560
WIRE 64 560 64 496
WIRE 64 560 -64 560
WIRE 208 560 208 224
WIRE 208 560 64 560
WIRE -224 608 -224 560
FLAG -224 608 0
SYMBOL npn 0 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL cap -80 432 R0
WINDOW 0 -45 30 Left 0
WINDOW 3 -78 62 Left 0
SYMATTR InstName C1
SYMATTR Value 1000e-6
SYMBOL voltage -224 416 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 9 0 1e-3 1e-3 5 10)
SYMBOL res -80 64 R0
WINDOW 0 -53 40 Left 0
WINDOW 3 -65 70 Left 0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL res 80 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 300
SYMBOL diode -208 368 R180
WINDOW 0 50 33 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL cap 192 160 R0
WINDOW 0 51 30 Left 0
WINDOW 3 28 62 Left 0
SYMATTR InstName C2
SYMATTR Value 1000e-6
SYMBOL LED 48 432 R0
SYMATTR InstName D4
SYMBOL res 80 32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 100
TEXT -202 584 Left 0 !.tran 20

 

[John Fields]

+9V>---[1N4148>]-----+--------+--[100R]--+
CR1 |R1 | R2 |
[1KR] | |
| C |
+------B 2N3904 C2|+
| E Q1 [1000µF]
| | |
C1|+ [300R]R3 |
[1000µF] | |
| [LED]LED1 |
| |K |
GND>-----------------+--------+----------+

Hi John, I made the circuit as described and then tweaked a few things
and altho' it is now fading out beautifully it does not illuminate
slowly.

I have changed to 220uF caps as they are better for the timing and
replaced some of the caps with pots to set the timing. The 100R
replaced with a pot adjusts the fade time perfectly. Adjusting the 1KR
doesn't seem to do anything noticable and the cap between base and
ground seems to only add to the fade time, putting it in only added to
the fade time.

---
That's odd, the way the circuit is supposed to work is that when you
turn the switch ON, C2 charges to 9V (minus a diode drop) through
CR1 and R2, R2 being in there to limit the charging current and give
the switch a break. C1 also charges up, through R1, (after you get
rid of CR1) its purpose being to cause the voltage on the base of Q1
(wired as an emitter follower) to rise slowly. Since the load is
connected to the emitter the voltage across it will follow the
voltage on the base, but the majority of the load current will be
supplied by the collector, keeping the impedance looking into the
base high. As a result of the slowly rising current into the LED,
it will fade in depending largely on the time constant of R1 and C1.

When the switch is turned OFF, the battery will no longer be
supplying the current for the LED, but C2 will until its charge is
depleted. As its charge becomes depleted the voltage across it will
fall, with the effect that the voltage on the base _and_ the
collector will fall, causing the current through the LED to fall
gradually, fading it out.

I think the reason it's not fading in properly is because C1 is too
small. You might try increasing it to around 1000µF to see what
happens.

Thinking a bit more about it, this might be a better circuit:

+9V>---+--------+--[10R]---+
|R1 | R2 |
[1KR] | |
| C |
+------B 2N3904 C2|+
| E Q1 [4700µF]
| | |
C1|+ [100R]R3 |
[1000µF] | |
| [LED]LED1 |
| |K |
GND>---+--------+----------+

Note that the diode wasn't needed since when you turn the switch off
it disconnects the battery from the circuit. Duh...


I'm not sure of the component values with your LED, but it simulates
nicely with what's shown above.

Here's the new circuit list:

Version 4
SHEET 1 880 680
WIRE -272 16 -384 16
WIRE -64 16 -192 16
WIRE 48 16 -64 16
WIRE 208 16 128 16
WIRE -64 64 -64 16
WIRE 208 160 208 16
WIRE 208 160 64 160
WIRE -64 208 -64 144
WIRE 0 208 -64 208
WIRE 64 304 64 256
WIRE 208 304 208 160
WIRE -64 352 -64 208
WIRE -384 432 -384 16
WIRE -256 432 -256 64
WIRE 64 432 64 384
WIRE -384 560 -384 512
WIRE -256 560 -256 512
WIRE -256 560 -384 560
WIRE -208 560 -208 64
WIRE -208 560 -256 560
WIRE -64 560 -64 416
WIRE -64 560 -208 560
WIRE 64 560 64 496
WIRE 64 560 -64 560
WIRE 208 560 208 368
WIRE 208 560 64 560
WIRE -384 608 -384 560
FLAG -384 608 0
SYMBOL npn 0 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL cap -80 352 R0
WINDOW 0 -45 30 Left 0
WINDOW 3 -78 62 Left 0
SYMATTR InstName C1
SYMATTR Value 1000e-6
SYMBOL voltage -384 416 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -77 57 Left 0
SYMATTR Value 9
SYMATTR InstName V1
SYMBOL res -80 48 R0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL res 80 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL cap 192 304 R0
WINDOW 0 51 30 Left 0
WINDOW 3 28 62 Left 0
SYMATTR InstName C2
SYMATTR Value 4700e-6
SYMBOL LED 48 432 R0
SYMATTR InstName D4
SYMBOL res 32 32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 -9 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 1000
SYMBOL voltage -256 416 R0
WINDOW 0 -53 5 Left 0
WINDOW 3 -242 110 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 0 1E-6 1E-6 10 20)
SYMBOL sw -176 16 M270
WINDOW 0 32 15 Left 0
WINDOW 3 32 44 Left 0
SYMATTR InstName S1
TEXT -202 584 Left 0 !.tran 20
TEXT -192 616 Left 0 !.model SW SW(Ron=1e-3 Roff=10Meg Vt=0.5Vh=0)

 

[ehsjr]

+9V>---[1N4148>]-----+--------+--[100R]--+
CR1 |R1 | R2 |
[1KR] | |
| C |
+------B 2N3904 C2|+
| E Q1 [1000µF]
| | |
C1|+ [300R]R3 |
[1000µF] | |
| [LED]LED1 |
| |K |
GND>-----------------+--------+----------+

Hi John, I made the circuit as described and then tweaked a few things
and altho' it is now fading out beautifully it does not illuminate
slowly.

I have changed to 220uF caps as they are better for the timing and
replaced some of the caps with pots to set the timing. The 100R
replaced with a pot adjusts the fade time perfectly. Adjusting the 1KR
doesn't seem to do anything noticable and the cap between base and
ground seems to only add to the fade time, putting it in only added to
the fade time.

---
That's odd, the way the circuit is supposed to work is that when you
turn the switch ON, C2 charges to 9V (minus a diode drop) through
CR1 and R2, R2 being in there to limit the charging current and give
the switch a break.

I'm guessing he's got the led & R3 on the collector side.

Ed

 

[[email protected]]

John Fields wrote:
I'm guessing he's got the led & R3 on the collector side.

Ed

Shorted transistor actually, but connected wrong way was just as
likely.

Macros

 

[[email protected]]

+9V>---[1N4148>]-----+--------+--[100R]--+
CR1 |R1 | R2 |
[1KR] | |
| C |
+------B 2N3904 C2|+
| E Q1 [1000µF]
| | |
C1|+ [300R]R3 |
[1000µF] | |
| [LED]LED1 |
| |K |
GND>-----------------+--------+----------+

Still trying to get this thing working, easy job my arse.

If any one is still willing to help me I now have the specs for the
LEDs I will be using.

Forward voltage = 3.1 - 3.4
Current 20mA
Peak pulse forward current 150mA
reverse voltage 5v
power disipation 80mW

Working on a 9 volt battery there will be 3 LEDs wired in parallel.
I have used the calculator here
http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator#parallel to
calculate that I need a 100 ohm resistor. Try as I might I can't get
this array of LEDs to fade in and out. Could anyone figure this out in
splice or something? I downloaded splice and it looks great but a bit
advanced for me I think, I can't get it to simulate yet, even saving
the previous lists as .app files I can open them and see the schematic,
but when I try to run it I get an error."previous analysis found: .tran
20"

Deadline on this looming and everytime I think I have it it fails,
gonna throw this breadboard across the room soon.

Macros

 

[John Fields]

John Fields wrote:
+9V>---[1N4148>]-----+--------+--[100R]--+
CR1 |R1 | R2 |
[1KR] | |
| C |
+------B 2N3904 C2|+
| E Q1 [1000µF]
| | |
C1|+ [300R]R3 |
[1000µF] | |
| [LED]LED1 |
| |K |
GND>-----------------+--------+----------+

Still trying to get this thing working, easy job my arse.

If any one is still willing to help me I now have the specs for the
LEDs I will be using.

Forward voltage = 3.1 - 3.4
Current 20mA
Peak pulse forward current 150mA
reverse voltage 5v
power disipation 80mW
---
OK
---

Working on a 9 volt battery there will be 3 LEDs wired in parallel.
I have used the calculator here
http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator#parallel to
calculate that I need a 100 ohm resistor. Try as I might I can't get
this array of LEDs to fade in and out. Could anyone figure this out in
splice or something? I downloaded splice and it looks great but a bit
advanced for me I think, I can't get it to simulate yet, even saving
the previous lists as .app files I can open them and see the schematic,
but when I try to run it I get an error."previous analysis found: .tran
20"

 

[[email protected]]

Yes, yes it is

Save the file as .asc and it should run.

yes, yes it does
now I can look into spice a bit more

Don't despair... When's your deadline?

just over a week to have it working then gotta fit it into an ornate
staff

Macros

 

[John Fields]

Yes, yes it is


yes, yes it does
now I can look into spice a bit more


just over a week to have it working then gotta fit it into an ornate
staff

---
OK.

First thing that's wrong is that calculator. You can't use a single
resistor for parallel LEDs because the forward voltage will be
slightly different for each one, with the one with the lowest Vf
hogging the current and maybe overheating and getting destroyed.


Here's a new list:


Version 4
SHEET 1 880 696
WIRE -272 16 -384 16
WIRE -64 16 -192 16
WIRE 96 16 -64 16
WIRE 256 16 96 16
WIRE 528 16 336 16
WIRE -64 64 -64 16
WIRE 96 160 96 16
WIRE -64 208 -64 144
WIRE 32 208 -64 208
WIRE 96 272 96 256
WIRE 256 272 96 272
WIRE 416 272 256 272
WIRE 96 304 96 272
WIRE 256 304 256 272
WIRE 416 304 416 272
WIRE 528 304 528 16
WIRE -64 352 -64 208
WIRE -384 432 -384 16
WIRE -256 432 -256 64
WIRE 96 432 96 384
WIRE 256 432 256 384
WIRE 416 432 416 384
WIRE -384 560 -384 512
WIRE -256 560 -256 512
WIRE -256 560 -384 560
WIRE -208 560 -208 64
WIRE -208 560 -256 560
WIRE -64 560 -64 416
WIRE -64 560 -208 560
WIRE 96 560 96 496
WIRE 96 560 -64 560
WIRE 256 560 256 496
WIRE 256 560 96 560
WIRE 416 560 416 496
WIRE 416 560 256 560
WIRE 528 560 528 368
WIRE 528 560 416 560
WIRE -384 608 -384 560
FLAG -384 608 0
SYMBOL npn 32 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL voltage -384 416 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -77 57 Left 0
SYMATTR Value 9
SYMATTR InstName V1
SYMBOL res -80 48 R0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL res 112 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 240
SYMBOL res 240 32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 -9 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL voltage -256 416 R0
WINDOW 0 -53 5 Left 0
WINDOW 3 -242 110 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 0 1E-6 1E-6 10 20)
SYMBOL sw -176 16 M270
WINDOW 0 32 15 Left 0
WINDOW 3 32 44 Left 0
SYMATTR InstName S1
SYMBOL LED 80 432 R0
WINDOW 0 -44 34 Left 0
WINDOW 3 -129 77 Left 0
SYMATTR InstName D1
SYMATTR Value NSPW500BS
SYMBOL res 272 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R4
SYMATTR Value 240
SYMBOL LED 240 432 R0
WINDOW 0 -39 34 Left 0
WINDOW 3 -129 75 Left 0
SYMATTR InstName D2
SYMATTR Value NSPW500BS
SYMBOL res 432 400 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R5
SYMATTR Value 240
SYMBOL LED 400 432 R0
WINDOW 0 -42 32 Left 0
WINDOW 3 -132 74 Left 0
SYMATTR InstName D3
SYMATTR Value NSPW500BS
SYMBOL polcap -80 352 R0
WINDOW 0 -41 33 Left 0
WINDOW 3 -76 62 Left 0
SYMATTR InstName C3
SYMATTR Value 1000e-6
SYMBOL polcap 512 304 R0
WINDOW 0 45 35 Left 0
WINDOW 3 24 67 Left 0
SYMATTR InstName C1
SYMATTR Value 8600e-6
TEXT -338 592 Left 0 !.tran 20
TEXT -344 624 Left 0 !.model SW SW(Ron=1e-3 Roff=10Meg Vt=0.5Vh=0)