atari punk color organ

Status
Not open for further replies.

MrDEB

Well-Known Member
curious if this has ever been done or even possible.
Am playing around building an Atari Punk Console but thinking of adding LEDs that are controlled by 3 band pass filters (low, mid high)
this is for another project for grandson to drive his parents nut with the sound and amuse him with the LEDs.
 

Attachments

  • vibra punk circuit.png
    85.9 KB · Views: 266
  • color organ schematic.pdf
    106.7 KB · Views: 273
Sort by date Sort by votes
The Harris P-channel Mosfet is an ordinary old Mosfet that needs 10V gate-source to fully turn on.
EDIT: You posted the datasheet of a different more common 10V Mosfet.
 
Upvote 0 Downvote
I think audioguru looking at wrong schematic (my fault).
using this schematic, the gate on the P channel mosfet being driven with 12v.
need to recheck the data sheet again
 

Attachments

  • mosfet-3904.png
    38.7 KB · Views: 192
Upvote 0 Downvote
here is a better description on my projects Hopefully the math is correct
LED NEON STRIP DESIGN

I have 3-Led strip projects

Design criteria


power supply = 12volts 5A max


LED neon strips = 12V


current draw = 0.8A/meter at 12volts (16.4 feet uncut length)


Desired current draw per Led strip section <= 1A ( .8A per 3.28feet) = .243A)


Each channel driving an Led strip per inch = .243A (1meter = 3.280feet / 12 = .273 inches


Keep sections of Led neon strips <= 3 feet = .8A per section





Original design called for IRL520 MOSFETS


revised for logic level Mosfets as suggested RFP12N0L ratedfor 12A Rds(on) = .200ohms





https://www.mouser.com/datasheet/2/308/1/RFP12N10L_D-2319858.pdf





The P channel mosfets https://www.vishay.com/docs/91167/irfi9630g.pdf


for driving the LED neon strips driven by color organ output
 
Upvote 0 Downvote
An old IRF520 Mosfet needs a 10V gate voltage to fully turn on.
A newer IRL520 Mosfet is logic level (see the "L"?) and needs a gate voltage of 5V to fully turn on.
 
Upvote 0 Downvote
MrDEB said:
the 16.4 ft. strip draws 5A [16.4' = 1 meter]
Click to expand...

MrDEB said:
connected to a 5m/16.4ft of led neon strip

specs are 12v .8A/meter 9.5W/meter (5m = 48W)

[Don't know where these numbers came from – use the more believable 5 amps for the 5 meter strip]
Click to expand...


Your math in the above post has some head-scratching errors and distractions.

First, if a 5 meter strip draws 5 amps, it draws 1 amp/meter.

Let's start from there, and convert to mA:

Strip draws 1000mA/meter-->

Strip draws 1000mA/meter × 1 meter/3.28 feet = 305mA/foot-->

Strip draws 305mA/foot × 1 foot/12 inches = 25.4mA/inch
 
Upvote 0 Downvote
Computing your FET junction temp rise depends on Ohm's law for Thermodynamics using the thermal resistance times the loss in Watts or mW. You got into trouble using 5V on the old IRF series then I showed why using 200 mOhm . I think you mistook that to be an ideal switch because soon after we understood you didn't have to rely on 5V nor were you using 9V but in fact 12V. Now that you have bought (?) 200 mohm switches, you will need thermal cooling . You would have been far better off with the IRZ44 but Nr. Nigel said incorrectly that it was a poor choice. (too soon)

So I don't know what you are going to do next.
 
Upvote 0 Downvote
It stays much simpler in metric. 1mA/mm. Obviously, the original spec was metric. However, if in imperial and 1yard = 1A it still get VERY confusing, 1 inch = 27.8mA.

Mike.
 
Upvote 0 Downvote
I highly recommend you buy a dozen of the IRLZ44 type Nch FETs which are inexpensive and only 24 mohms in a TO220 package. The IRLZ series is 10x better than the IRL series for low resistance which is both a low voltage drive and better than the old IRF series which needs >= 10V drive.

Then you will NOT need heatsinks or NPN inverting switches to raise the 5V to 12V to drive the old IRF switches.

When you need 4A for 5m strip, the switch voltage drop tells you the resistance V/I=R if you know the current and measure the voltage.


The 48A rating only applies to pulses unless you have a CPU forced air heartsink with insulator.
 
Upvote 0 Downvote
Mixing systems will cause inconsistencies and electricity tends to be metric, is there an imperial system for Amps/Volts etc. I know there is for heat and energy (BTU and Ergs?) but much prefer Joules.

Mike.
 
Upvote 0 Downvote
Pommie said:
Mixing systems will cause inconsistencies and electricity tends to be metric, is there an imperial system for Amps/Volts etc. I know there is for heat and energy (BTU and Ergs?) but much prefer Joules.

Mike.
Click to expand...

Amps are amps, volts are volts, power in watts, and watts/horsepower = one half the year Columbus "discovered" America (1492 --> 746).

There's enough confuse in the 3 overlapping and co-mingled threads MrDEB has going already without introducing more.
 
Upvote 0 Downvote
will look at buying the IRLZ44 but will I ever get above 2A current draw per channel?
After Popcorn deciphered my crazy math, I purchased a map measuring wheel tool (2.5ma per inch) so I can better design the led neon sign. Keeping the current draw per channel < 2A per channel.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Fade each color of RGB LED's with 555 / 4029
3 4 5
Replies
82
Views
12K
ThomsCircuit
J
Organ project
Replies
7
Views
3K
Nigel Goodwin
Organ Cue Light
Replies
8
Views
2K
MJC60
P
Analog to Digital converter
Replies
15
Views
3K
Reloadron
G
Color Sensor Diode
Replies
9
Views
4K
GabeChan
G
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…