that is two different circuits... you mean to use one on the right, this is it.

note that it is not complete. you need to add into schematics diodes CR11-CR32
basically each output on U6 and U7 has two diodes (OR circuit).
so you need to follow the pattern that is started and add rest of the diodes yourself.
i added couple more in case you did not catch on what the pattern is.
U2 and U3 are moving eye in one direction (down). when their output is set, diodes activate corresponding U6/U7 channel.
then you have U4 and U5, they also run in same direction (down) of course but their outputs (via diodes) are wired to U6/U7 channels in reverse order (up), making it look like eye is moving in the reverse direction.

good luck with 70s electronics.

View attachment 369255

and if I want more outputs to a total of 32??

 

and el cheapo unit like RP has two cores, it can easily do voice change too thanks to I2S interface. for example using ICS-43434 or INMPL441 microphone and 3W amp (MAX98357A)

 

and if I want more outputs to a total of 32??

you need to keep cascading those counters (4017), you will need total of 8 of them (each 4017 can do 10 states) and you will need more diodes and more ULNxxxx ICs. actually last output of one 4017 is not usable for LEDs in this case because it is a 'handshake' signal to rest of counters. so you get 4 ICs x9 states gives you max 36 channels. then you have to double it for reverse.
you should really consider how to route all that. wiring will be mess even with the just 16 channels.

in comparison, modern version using MCU and addressable LEDs, one can get long enough LED rope, cut it to whatever length is needed and that is the only hardware change. all wiring stays the same. in fact you can connect more than one rope and make this run around swimming pool. 16 or 32 or 3200 LEds makes no difference.

 

Analog version using LM3914s and a LM358 triangle waveform generator.
Video

 

Just a thought: could the leading and trailing effect just be light bleeding from a single active lamp? I suspect the prop makers did it the simplest way possible. Up/down counter and a couple of 74154 or something similar?

 

Just a thought: could the leading and trailing effect just be light bleeding from a single active lamp?

That's part of it -- LEDs tend to be more of a point source than incandescents. But incandescents heat and cool (relatively) slowly, giving a soft on/off that LEDs lack -- along with a warm color.

These days, the effect can be simulated quite well with software and the appropriate hardware.

 

Analog version using LM3914s and a LM358 triangle waveform generator.
Video

View attachment 369263

Bertus, I think this is the way Im going, altho with incandescent, and driving transistors.

 

Analog version using LM3914s and a LM358 triangle waveform generator.
Video

View attachment 369263

can you please just add a few sample switching transistors to the schematic for incandescents please, just so I have it all on 1 schematic

 

the simplest option is to use high side switch (PNP or PMOS), mosfets would be better (like AO3401A)

 

the simplest option is to use high side switch (PNP or PMOS)
View attachment 369298

Thank you

 

always check datasheet. for example AO3401A is small and packs a punch but Vgs_max is only 12V. when supply is 9V, that is not a problem and R183 can be removed.

 

always check datasheet. for example AO3401A is small and packs a punch but Vgs_max is only 12V. when supply is 9V, that is not a problem and R183 can be removed.

It will be running on 9v, but the lamps will be 3

 

How much current do the bulbs draw at 3 volts?

 

it depends on bulb. which one you have? 12V grain of wheat variety is usually 30mA (that is 360mW) so 3V may be drawing 120mA, don't know...

 

it depends on bulb. which one you have? 12V grain of wheat variety is usually 30mA (that is 360mW) so 3V may be drawing 120mA, don't know...

I will have to check the specs on the bulb

 

I know this is heresy, but the AI information in post #1 might not be accurate.

A significant difference between a Knight Rider circuit and a Cylon circuit is the brightness of the bulbs ahead of the "main" bulb being lit at full brightness. In a Knight circuit, the bulb immediately ahead of the bulb being lit is dark. In the post #36 video, it is clear that at least two of the bulbs ahead of the main bulb are lit dimly. Watching YouTube clips slowed down to 25%, it looks to me like there is a five- (or more) bulb traveling pattern, so the scanner looks like a moving ellipse with a fade-up leading edge and fade-down trailing edge, rather than a circle with a tail. Bloom from the brightness of the main bulb makes the sensor look more like an ellipse than an oval.

This means that more bulbs are at least partly on more often, a significant increase in heat load. The original Knight device looks like automotive turn signal or brake bulbs known for their large photonic lag time, so they got the trailing tail for free.

How many lights (steps in the pattern) are you trying for? If I'm right, you're looking at three or more drive transistors per bulb.

ak

Update: Screen grab from post #36.



In this image, the sensor is moving from left to right. Panic might be righ about light bleed, but there is a clear trailing tail extending behind the sensor to the left that is not extending ahead of the sensor to the right.

 

i thin the light bleed through was due light bulbs being encased in resin. but one should be able to simulate that by placing resistors from one output to the next on driver chip (such as LM3914). they will form voltage dividers with nearby channels. with that, single transistor per output is needed.

 

How about a sawtooth feeding a LED VU meter LM3914 (lineair version).

 

How about a sawtooth feeding a LED VU meter LM3914 (lineair version).

That is already shown in post #44.

 

this is an example of what i meant by adding resistors across channels (in this case R1-R11) in #57.
result is similar to using capacitors but it affects both lead and trail edges and it is dirt simple to size and add.