Difference between revisions of "User:Chotee/NoFeedback-ManagementIntervention"

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Alternative name:  
 
Alternative name:  
−
* Management Intervention  
+
* Free-Runner / Management-Intervention  
  
 
== Parts ==
 
== Parts ==
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** max led forward current is 20mA.
 
** max led forward current is 20mA.
 
** RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
 
** RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
−
** LEDs max continious current at 20mA.  
+
** LEDs max continuous current at 20mA.  
 
* 22x22 leds (484) [sqrt(500) = 22.36..]
 
* 22x22 leds (484) [sqrt(500) = 22.36..]
−
* Powered by 12v PC PSU or 20v LT power-brick.
 
  
−
=== 12v ===
+
=== 20v supply ===
−
* 12v/3.8 (V-max-led-forward) = 3.15 LEDs; 3 LEDs in a chain.
 
−
* There are 161+1/3 chains [484/3]
 
−
* Vmax = 3 * 3.8Vf = 11.4v; 0.6v left.
 
−
* Vmin = 3 * 3.2Vf = 9.6v; 2.4v left.
 
−
* current limit power-max: 2.4v*20mA = 48mW.
 
−
* Total Current: 20mA * 162 = 3.24A
 
−
* Total power: 3.24A * 12v = 38.8w
 
−
 
 
−
=== 20v ===
 
 
* 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
 
* 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
 
* There are 96.8 chains [484/5]
 
* There are 96.8 chains [484/5]
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* Total Current: 20mA * 97 = 1.94A
 
* Total Current: 20mA * 97 = 1.94A
 
* Total power: 1.94A * 20v = 38.8w
 
* Total power: 1.94A * 20v = 38.8w
 +
* 22 leds; 4x5led chain + 1x2led chain.
 +
** 2 led chain needs a 470ohm ¼Watt resistor (or 2x1000ohm in paralel) to drop the voltage.
  
 
== Components ==
 
== Components ==
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* Rs = 10
 
* Rs = 10
 
* Opamp >20v;  
 
* Opamp >20v;  
−
** OPL best fit: LM358DR  (But has two channels) -- €1.17 (100pcs) -- https://nl.aliexpress.com/item/10PCS-LM358DR-SOP8-LM358-SOP-LM358DT-SMD-LM358DR2G-new-and-original-IC-free-shipping/32533323519.html
 
 
** *Single* channel opamp: LM321 -- €1.99 (100pcs) -- https://nl.aliexpress.com/item/Free-Shipping-100PCS-100-NEW-LM321MFX-LM321MF-LM321-A63A-SOT23-5/1924012475.html -- http://www.ti.com/lit/ds/symlink/lm321.pdf
 
** *Single* channel opamp: LM321 -- €1.99 (100pcs) -- https://nl.aliexpress.com/item/Free-Shipping-100PCS-100-NEW-LM321MFX-LM321MF-LM321-A63A-SOT23-5/1924012475.html -- http://www.ti.com/lit/ds/symlink/lm321.pdf
 
* Mosfet. >20v; >20mA:  
 
* Mosfet. >20v; >20mA:  
 
** From the OPL: BSS138W-7-F; 50V; 200mA -- €1.36 (100pcs) -- https://nl.aliexpress.com/item/50PCS-BSS138LT1G-SOT23-BSS138-SOT-MOSFET-SMD-new-and-original-IC-free-shippin/32518915182.html -- http://www.onsemi.com/pub/Collateral/BSS138LT1-D.PDF
 
** From the OPL: BSS138W-7-F; 50V; 200mA -- €1.36 (100pcs) -- https://nl.aliexpress.com/item/50PCS-BSS138LT1G-SOT23-BSS138-SOT-MOSFET-SMD-new-and-original-IC-free-shippin/32518915182.html -- http://www.onsemi.com/pub/Collateral/BSS138LT1-D.PDF
 +
* a 100nF capacitor as small voltage buffer.
  
 
== Circuit ==
 
== Circuit ==

Latest revision as of 16:08, 5 April 2018

1mx1m screen of RGB lights that slowly and independently change colour. All patterns are just your mind playing tricks on you.

Alternative name:

  • Free-Runner / Management-Intervention

Parts

Electronics

  • 500 Slow color changing RGB leds.
    • max led forward current is 20mA.
    • RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
    • LEDs max continuous current at 20mA.
  • 22x22 leds (484) [sqrt(500) = 22.36..]

20v supply

  • 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
  • There are 96.8 chains [484/5]
  • Vmax = 5 * 3.8Vf = 19v; 1v left.
  • Vmin = 5 * 3.2Vf = 16v; 4v left.
  • current limit power-max: 4v*20mA = 80mW.
  • Total Current: 20mA * 97 = 1.94A
  • Total power: 1.94A * 20v = 38.8w
  • 22 leds; 4x5led chain + 1x2led chain.
    • 2 led chain needs a 470ohm ¼Watt resistor (or 2x1000ohm in paralel) to drop the voltage.

Components

Circuit

[from http://www.falstad.com/circuit/circuitjs.html] 

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