Topo Map with flashing LED

Bernard

Joined Aug 7, 2008
5,784
Weird!, on You Tube, try Jack Bernard, active 5 days ago, and there it was with all of the others, but 100 0058 is the new one. Also forgot to post Stream #21. I'll post this & go look for 21. Found. Added constant current charging of C1 by LM334. R2 adjusts current, about 600 uA for 3 sec. up, R1, 15k =3 sec. down. Added emitter follower, 2N2222A, to prevent over loading C1 by R 5, added benefit , slight amplitude reduction of slow clock & with R8 a slight shift up so bright & almost dark are of the same duration, looks smoother.

Strean # 21 00000.jpg
 

Bernard

Joined Aug 7, 2008
5,784
Can do either or both, I can always use a few 555's, 4017's, TIP120, TIP125, enough to = about $ 15 so I can buy a circuit board & misc. parts & return postage.
Video takes a bit of searching, Jack Bernard is sometimes far down on the list to " active 5 days ago * 7 videos". Will have to remember to add a day every day.
 
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Thread Starter

lednoob

Joined Jan 13, 2016
171
This is what Wendy's PWM looks like for me


I ordered the 4022 and LM393 so hopefully I will have better luck.
Can do either or both, I can always use a few 555's, 4017's, TIP120, TIP125, enough to = about $ 15 so I can buy a circuit board & misc. parts & return postage.
Video takes a bit of searching, Jack Bernard is sometimes far down on the list to " active 5 days ago * 7 videos". Will have to remember to add a day every day.
 

Bernard

Joined Aug 7, 2008
5,784
You do not need 4022, 4017 just as good, I just had some 4022's & no 4017's.
Which version are you planning on, one of 4 on like Stream # 16, video 100 0056 ?
Were you able to find video 100 0058 ?
 
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Thread Starter

lednoob

Joined Jan 13, 2016
171
You do not need 4022, 4017 just as good, I just had some22's & no 4017's.
Which version are you planning on, one of 4 on like Stream # 16, video 100 0056 ?
Were you able to find video 100 0058 ?

I wanted to get the 4022 for Stream #15 marquee 100 0056. This is perfect for my channel B (BLUE).

I also like 100 0057 and 100 0058 but I would like the 100 0057 a little faster in dimming in & out. This is perfect for my channel A (RED). I want to make actual PCB's this weekend.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
I wanted to get the 4022 for Stream #15 marquee 100 0056. This is perfect for my channel B (BLUE).

I also like 100 0057 and 100 0058 but I would like the 100 0057 a little faster in dimming in & out. This is perfect for my channel A (RED). I want to make actual PCB's this weekend.

Ok here is stream #15. Please tell me what you think. I put a 10k pot 555-7 to v+. C1 is 100 uf

 

Bernard

Joined Aug 7, 2008
5,784
I think you have it. Will look much better when LED's are in single file. With blue LED's with Vf around 3V, better go to 3 in series. If 1 mA is bright enough may not need LED drivers. 4022 or 4017 outputs have about 90 ohms internal impedance so the heavier the output is loaded the lower will be output V. Some examples @
12 V VDD:
I in mA___V
2.7_____11
4.7_____10.5
10.9____9.5
17.5____7.7
Assume strings of 3 in series, 6 strings in parallel @ 1 mA / string = 6 mA / output. 6 X 90 = .54 V, LED Vf 3V
X 3 = 9V. 12V- 9.54 = 2.46 V / .001 = 2.46 k or 2.4 k for current limiting R. Depending on real values of blue LED.
Wendy's modified PWM, 100 0057: To change period make R1 a pot. maybe 10K in series with 4.7K R.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
I think you have it. Will look much better when LED's are in single file. With blue LED's with Vf around 3V, better go to 3 in series. If 1 mA is bright enough may not need LED drivers. 4022 or 4017 outputs have about 90 ohms internal impedance so the heavier the output is loaded the lower will be output V. Some examples @
12 V VDD:
I in mA___V
2.7_____11
4.7_____10.5
10.9____9.5
17.5____7.7
Assume strings of 3 in series, 6 strings in parallel @ 1 mA / string = 6 mA / output. 6 X 90 = .54 V, LED Vf 3V
X 3 = 9V. 12V- 9.54 = 2.46 V / .001 = 2.46 k or 2.4 k for current limiting R. Depending on real values of blue LED.
Wendy's modified PWM, 100 0057: To change period make R1 a pot. maybe 10K in series with 4.7K R.
ok cool. I really need to get Wendy's PWM wotking so I will try again today.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
I think you have it. Will look much better when LED's are in single file. With blue LED's with Vf around 3V, better go to 3 in series. If 1 mA is bright enough may not need LED drivers. 4022 or 4017 outputs have about 90 ohms internal impedance so the heavier the output is loaded the lower will be output V. Some examples @
12 V VDD:
I in mA___V
2.7_____11
4.7_____10.5
10.9____9.5
17.5____7.7
Assume strings of 3 in series, 6 strings in parallel @ 1 mA / string = 6 mA / output. 6 X 90 = .54 V, LED Vf 3V
X 3 = 9V. 12V- 9.54 = 2.46 V / .001 = 2.46 k or 2.4 k for current limiting R. Depending on real values of blue LED.
Wendy's modified PWM, 100 0057: To change period make R1 a pot. maybe 10K in series with 4.7K R.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
This is the effect I am looking for but to fade in & out about 150 LED's. The updated circuit that you have provided I have not tried yet but I will do that later today. I will need some help calculating current resistors for that many. I will be using RED. Probably the 3v vf.
 

Bernard

Joined Aug 7, 2008
5,784
Circuit A, 150 throbbing red LED's via PWM. With 12 V power supply,connect 5 red LED's in series & with a 1k6 ohm current limiting R. Measure V at top of 5th LED, might be around 8.5V ? Are they bright enough? Adjust R to suit. For 150 LED's with 5 LED's in series will need 30 strings. If V reading of 5 LED's is over 10 V, then cut strings to 4 in series.
 

Bernard

Joined Aug 7, 2008
5,784
Circuit B, 65 blue LED's, marque style, segments of 4 LED's, 3 on, 1 off. A string is 3 LED's & a R in series. 4
outputs from 4022 or 4017, we'll call them stages A,B,C, & D. 60 LED's / 3 = 20 / 4 = 5 strings / stage. Add a short string, 1 LED & R / stage for 4 more LED's = 64 total.
Blue LED might look something like this, I in mA, V = volts:
I____V
1___2.65
3___2.8
5___2.91
15__3.19
With 12 V, connect 3 blue LED's & a 1k5 R in series, measure LED V. Are they bright enough ?
I would use 4 2N2222's connected as emitter followers to drive the LED's
 
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