This thread is for the discussion of the Knight Rider circuit.
Circuit URL:
http://www.555-timer-circuits.com/knight-rider.html
Circuit URL:
http://www.555-timer-circuits.com/knight-rider.html
Knight Rider
- Thread starter Admin
- Start date
Hi RB_H17,
The Decade Counter (4017) has 10 outputs which sequentially go HIGH one after the other and each time an output goes HIGH it lights up the corresponding LED. An example a complete sequence
from when you turn on the circuit would be as follows:
Output 0 turns on D6
Output 1 turns on D5
Output 2 turns on D4
Output 3 turns on D3
Output 4 turns on D2
Output 5 turns on D1
Output 6 turns on D2
Output 7 turns on D3
Output 8 turns on D4
Output 9 turns on D5
The end LEDs D6 and D1 only turn on once throughout a complete sequence and require only one output with one resistor. Each of the other LEDs from D2 to D5 turn on twice, each requiring two outputs and therefore two resistors also.
Does that make sense?
Regards,
Admin
The Decade Counter (4017) has 10 outputs which sequentially go HIGH one after the other and each time an output goes HIGH it lights up the corresponding LED. An example a complete sequence
from when you turn on the circuit would be as follows:
Output 0 turns on D6
Output 1 turns on D5
Output 2 turns on D4
Output 3 turns on D3
Output 4 turns on D2
Output 5 turns on D1
Output 6 turns on D2
Output 7 turns on D3
Output 8 turns on D4
Output 9 turns on D5
The end LEDs D6 and D1 only turn on once throughout a complete sequence and require only one output with one resistor. Each of the other LEDs from D2 to D5 turn on twice, each requiring two outputs and therefore two resistors also.
Does that make sense?
Regards,
Admin
Hi 
Very rusty with my electronics knowledge and I have been trying to recreate this circuit in Yenka but I keep getting too much voltage to the 4017 chip. 3V instead of the maximum 1V apparently. I have double checked the schematic but I cant seem to spot any obvious mistakes anywhere. Here is the circuit if anyone can shed any light on where I am going wrong?
Thanks
Edit - if I lower the voltage to 6v's it works fine although the LEDs dont seem to be very bright?
Very rusty with my electronics knowledge and I have been trying to recreate this circuit in Yenka but I keep getting too much voltage to the 4017 chip. 3V instead of the maximum 1V apparently. I have double checked the schematic but I cant seem to spot any obvious mistakes anywhere. Here is the circuit if anyone can shed any light on where I am going wrong?
Thanks
Edit - if I lower the voltage to 6v's it works fine although the LEDs dont seem to be very bright?
Hi,
My advice is to forget most of the wire links shown on the breadboard above. You can construct this circuit by simply making the resistors do the work (stretch). Use a small breadboard like the one I have used (see photo) and although it looks 'orrible' it works a treat. You know it makes sense. Oh yes, nearly forgot. Part of the music box circuit is the same as this circuit so either way keep some of the relevant circuit and use it again. I built the music box and then followed it with this one. Have fun.
Konrad
My advice is to forget most of the wire links shown on the breadboard above. You can construct this circuit by simply making the resistors do the work (stretch). Use a small breadboard like the one I have used (see photo) and although it looks 'orrible' it works a treat. You know it makes sense. Oh yes, nearly forgot. Part of the music box circuit is the same as this circuit so either way keep some of the relevant circuit and use it again. I built the music box and then followed it with this one. Have fun.
Konrad
Attachments
Regarding this circuit I have been experimenting with a small piezo sounder and have found that you can produce several different sounds by grounding the piezo and placing the positive wire on the various resistors, ic side of the resistor. I would imagine that linking several piezo's would produce a very pleasing sound output. The piezo responds with its tone every time the particular LED flashes. I also used a one micro Farad capacitor instead of the 2.2 micro Farad capacitor shown on the schematic. This gives a faster flash rate and reduces the time interval between sound outputs. Love it. If anybody links more than one piezo to the circuit please let us know what the outcome is like.
Konrad
Konrad
I am back onto my circuit building after the arrival of my little boy (he took a lot more looking after than I was expecting ). Given I am now really short on tie I was wondering if someone would be kind enough to help me with the list of parts that I need to purchase? I am based in the UK and will be using http://cpc.farnell.com/ website.
As I mentioned in my previous post I am very rusty and the first stumbling block that I have came up against is that the LEDs come in different voltages! What voltage does the LED need to be?
Also, Im not going to have a chance to etch a circuit board so is there a "solderable" breadboard that I can buy? The circuit is just for a fancy dress outfit so a bit of a bodge job will be fine.
Many thanks.
). Given I am now really short on tie I was wondering if someone would be kind enough to help me with the list of parts that I need to purchase? I am based in the UK and will be using http://cpc.farnell.com/ website.As I mentioned in my previous post I am very rusty and the first stumbling block that I have came up against is that the LEDs come in different voltages! What voltage does the LED need to be?
Also, Im not going to have a chance to etch a circuit board so is there a "solderable" breadboard that I can buy? The circuit is just for a fancy dress outfit so a bit of a bodge job will be fine.
Many thanks.
High self_dystruct,
have a look at my breadboard layout previously posted. As far as I know breadboards do not come much smaller if at all than the one shown in the photo. I suppose it would be possible to add the additional LED's on a larger breadboard. I have mentioned other components that certainly enhance the basic layout. Experimentation is the key. Have fun.
Konrad
have a look at my breadboard layout previously posted. As far as I know breadboards do not come much smaller if at all than the one shown in the photo. I suppose it would be possible to add the additional LED's on a larger breadboard. I have mentioned other components that certainly enhance the basic layout. Experimentation is the key. Have fun.
Konrad
This is an excellent breadboard simulator I found. It is limited on the components it has but you can create your own in it. I have not done much with it but will give instructions once I learn it if you want. The program is a Java based app so you need java on your computer. The program is totally free! Here is the LINK to it and a screen shot below, I just threw some things on a board to take the screen shot for you so it is not a real circuit.
Great program and very useful. But he was wondering if we had anymore breadboard diagrams like the ones the admin and I were making.
No, those diagrams are from this site specifically. Look at the bottom right corner of all the diagrams. Notice how they say 555-timer-circuits.com? That's because they originated from here. The admin made a thread that has all the components for download and viewing here. It's where I got my images so I could make my own diagrams. You're going to have to get somebody to make them, or make them yourself, if you want any more. I haven't really made any recently but I can tell you how to make them. Simply copy, paste, rotate, and label the components in the appropriate places on breadboard image (It's useful to have multiple layers) so that you have a complete diagram that is to scale and accurate. I use Paint.Net for my diagrams and I may do a video tutorial with an example within the next couple of weeks, depending on my schedule.
No, those diagrams are from this site specifically. Look at the bottom right corner of all the diagrams. Notice how they say 555-timer-circuits.com? That's because they originated from here. The admin made a thread that has all the components for download and viewing here. It's where I got my images so I could make my own diagrams. You're going to have to get somebody to make them, or make them yourself, if you want any more. I haven't really made any recently but I can tell you how to make them. Simply copy, paste, rotate, and label the components in the appropriate places on breadboard image (It's useful to have multiple layers) so that you have a complete diagram that is to scale and accurate. I use Paint.Net for my diagrams and I may do a video tutorial with an example within the next couple of weeks, depending on my schedule.