I Have attached a diagram of an RGB controller I am trying to build.
When I apply power the green and Blue LED in the tri colour LED seem to glow but nothing happens.
I am cncerned about my transistor switching on the LED from the CD4029 orginally the circuit required a common Cathode LED but I could not find any so adjusted the circuit as I thought correct.
I have found the 4029 gets warm not HOT and nothing happens.
are the transistors switch the LED's correct ?
How can I build a simple circuit to switch a single led, from the 4029 this would enable me to check if the IC is faulty.
hi,
Pin #5 is an Input, as are 12,13, 3 , so they are open circuit 'floating' ,, connect them to 0V.
EDIT:
Added a simulation for you. Shortened the 1sec rate for SIM ONLY.
Thanks for the advice! before I try this, is it possible for me to drive the LED directly from the output of the 4029 just for testing purposes.
Once I have it working then I can add the Transistors to the output, this will enable me to drive several LED's at once. The Purpose of the Capacitor on the base is to produce a fading effect so I can get diffarent colours from the Tri Colour LED.
Thanks for the advice! before I try this, is it possible for me to drive the LED directly from the output of the 4029 just for testing purposes.
Once I have it working then I can add the Transistors to the output, this will enable me to drive several LED's at once. The Purpose of the Capacitor on the base is to produce a fading effect so I can get diffarent colours from the Tri Colour LED.
The capacitors will only delay the transistor switching on. Once the capacitor reaches 0.7V the transistor will turn on. I assume this is why Eric left them off his diagram.
Just wire the 10 k resistors straight to the cathodes of the LED. This will provide a usable indication although it will be inverted from what the transistors will show.
By the way, I don't believe the 4029 should get warm.
Thanks Very Much for all the advice I have now got the LED's Switching on But there is no single distinct colour. I seem to have a mixture of Red and Green and Blue. Do I need to have diffarent resistors for each of the LEDs on the tri colour LED?
Just wire the 10 k resistors straight to the cathodes of the LED. This will provide a usable indication although it will be inverted from what the transistors will show.
By the way, I don't believe the 4029 should get warm.
Blue LEDs tend to have a forward voltage of around 3V and so need a smaller resistor. If you post a link to the data sheet then someone will work out how to calculate the value.
I dont seem to be making any progress with this project. Q3 (Pin 14) goes high every second Pulse. I have tried 3 seperate IC's and the same result. After several pulses the output goes high and stays high. I am at a total loss as to where to go from here.
I dont seem to be making any progress with this project. Q3 (Pin 14) goes high every second Pulse. I have tried 3 seperate IC's and the same result. After several pulses the output goes high and stays high. I am at a total loss as to where to go from here.
I have an LED on the output of the 555 to try and count the pulses but do have a 12 Volt pulse going to pin 15.
The LED's are 10K on the outputs
I have an output on pins 6 and 11 but nothing else. Pin 11 apears to change more frequently but I cant work out any patten and dont ubderstand why the out put pin 14 never goes high.
Orginally it was to drive a Tri colour LED now have individual LED's.
Would I need to make major changes to use all four outputs and where can I find a truth table so I can see what should be on when.