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 Post subject: MK102 modifcation
PostPosted: Sun Aug 13, 2017 12:22 am 

Joined: Sun Aug 13, 2017 12:09 am
Posts: 1
Need help with Led project (time sensitive)
Hello I am currently working on a project that has less than 3 weeks till the suspense date. One aspect of the project I will be adding some LEDS. I want these LEDs to flash. So I got the following stuff for this project:
LED Flashing kit MK102 by Velleman from Fry’s Electronics
100 rectangular flat clear 2mmx5mmx7mm LEDs (DC 3V 20mA)
400 DiCUNO 3mm LED assorted colors
Forward Voltage: R/Y 1.8-2.2V B/G/W 2.8-3.2V
Max Current: 20mA

The issue:
So I want to take the LED flasher kit and instead of using the two supplied red LEDs I want to run two series of LEDs. One series will have two flat clear LEDs and one clear 3mm LED. The second series would have one flat LED and one 3mm clear LED. I would like to use most of the other circuitry that comes with the kit and simply add each series of LEDs where you would normally add the two red supplied LEDs. This kit runs on a 9 volt battery. So, I am assuming that I can simply replace the supplied resistors that come with the kit with ones that account for the LEDs I want to use? This kit comes with two 1K resistor and two 10k resistors. If I calculate the resistance needed for 5 LEDs (3V and 20mA) at 9V I end up with some suggestions but I am unclear if the other components of the kit trimmers, transistors, and capacitors have resistance needs that I do not know about. I see that two of the resistors are connected to the LEDs while the other two are connected between the trimmers and capacitors. I am completely overwhelmed with this problem and I am sure its very obvious that I am very new to electronics. I hope this is making sense. Any help you can offer would be appreciated.

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