4017 & 555 Police LED Lights Project (noob question)

Quote 1000110 "so the first step is to corect it and then use pads and then send the gerber files to a company to create it"

Why would you not bread board the proto type first and verify it works as expected. Committing this to a PWB before testing it would be foolish.

Two of the diodes are not connected in your schematic. Also your inserted graphics are very blurred, when copied into a viewer. They are not clear enough viewed as is, in my browser.

I don't see any decoupling capacitors to keep the LED switching current noise from the IC components (as well keeping their noise from the power input). Also add large bulk capacitors for the LEDs to draw current from.

I see where your copying your original schematic from:

4017 decade counter

Or so your description appears in this relative to the 6 resistors vs your diodes, which will "OR" the outputs from the 4017.

I'd skip the breadboard and go directly herehttp://www.dcaclab.com/

here is a better photo of the schematic

Yeah, the diodes are just a "poor man's" OR gate.

Resistors are tricky buggers tho'. If you juggle all the values right, they can be an AND gate (need all high to get an output to turn on) or an OR gate (any of 'em high). With diodes at about $6/100 (or less) - the cost doesn't really come into it.

Back in the day, we used to use arrays of discrete diodes for encoding/dedoding data (ASCII etc) over parallel busses. Same thing happens inside a FPGA or whatever these days.

I made a D/A converter once (many years ago) using discrete resistors of doubling values (before I discovered R 2R ladder networks). It wasn't very good, but I had more time than money.

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The "incomplete" bit of your circuit - in case you haven't spotted it yet - is the connection (via diodes) of the drive transistor bases to the clock signal, which makes the ON LEDs pulsate at the clock frequency. Your circuit will just turn them on steadily.

nice. thank you all for the feedback it really helped. i think i figured it out. now i`m thinking to be a little arogant and add a speaker with the sirens of a police car, any toughts on that? i presume i need to make some major changes to the project but it`ll be worth it cuz i`ll stand out from the crowd .

Well have a stab at it then, and maybe these guys will help you. If you get too greedy you'll just get the big finger.

cnc jim

so this seems an easy enough schematics...i just need to try and interpret it. if i do this more i`ll get good at it lol this is fun

An audio power amplifier is a laudable but out of scope addition to this project. The circuit you've drawn is more likely to damage your speak than make a clear, understandable sound. I know many PA speakers are not very clear in the first place. Your amplifier will provide a DC voltage to your speaker. This DC voltage will damage most speakers. If you don't offset the output signal to run in the middle of your supply voltage of +12 V there will be significant distortion as half of the waveform disappears.

Wait a minute, your amplifier has either a 100 ohm or 100K ohm output impedance. In either case your output waveform into an 8 ohm speaker will be so attenuated you will neither damage the speaker nor drive it hard enough to make things at all audible. That is unless your speaker is extremely efficient for the most amount of audio power you deliver to this 8 ohm speaker is about 1.5 milliwatts of power.

Get the lights to flash first.

ieeei :D no big finger there ^^, yeah i`ll do that, thank you :D

Replace your speaker with a Phiso sounder and fix resistor values and drive phiso with your 4017 output through different resistors to get the wobble.

ON THE DIAGRAM THE MIDDLE DIODES INSIDE YOUR CIRCLE IS NOT CONNECTED TO THE 4017 OUTPUTS. I enlarged the circuit lay out with your two circles to see their connection but your circles cover the important part. The 4017 out puts are make before break, means the next pulse will go high while the previous is still high, that is why you need to isolate the outputs from each other with the diodes.