I cut leds to just one per relay still just one led lit steady. I measured output pin with voltmeter reading close to -12v steady. I don't know if that wil help you or not.
The original circuit used a single 555 to switch both banks without relays, I added them after I boosted the voltage and I did have diodes on the relays but when they were in nothing light up. at least without them one bank lights
Hello,
Although my paint skills are not the best I hope this helps.
Where:
C1 = 10uF
C2 = 0.1uF
R1 = 82 ohms
R2 = ! MegaOhm Variable Resistor
R3 = 150 Ohm
R4 = 150 Ohm
Six LED's in each bank,
Each LED specs are 20 mA and 3.3V
Btw they are 20 mA leds that use 3.3v forward. used a resistor calculator online to decide on the resistor values leds are getting enough power but seems to me that no pulse is coming from the 555 but that's just a student's impression
Thank You for your reply.
I do have the leds in parallel and I have gotten this to work on the breadboard fairly nicely, but when I soldered it all onto a chip it stopped. I've checked and rechecked solder joints but I cannot figure out what changed.
Hi, I have a circuit that I am working on that I adapted from the 6v version here http://electronician.blogspot.com/2009/09/555-timer-project-15v-led-flasher.html I have a 12v supply with a total of 48 leds 24 on each bank. I have gotten previous version to work with single leds but now that I...