Need help with this police horn circuit

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Scruffneck

New Member
#1
#1
I tried 3 times on veroboards to create it before getting a breadboard and still can't make it work with the breadboard. Here's the schematic, followed by a YouTube vid of it working:


Please can someone show me how to put this to a breadboard. Seriously not sure what I'm doing wrong. Thank you please. This is something for my bike and I really want to make it!
 
George

George

Moderator
#3
#3
Scruffneck said:
I tried 3 times on veroboards to create it before getting a breadboard and still can't make it work with the breadboard. Here's the schematic, followed by a YouTube vid of it working:


Please can someone show me how to put this to a breadboard. Seriously not sure what I'm doing wrong. Thank you please. This is something for my bike and I really want to make it!
Click to expand...
Are you having trouble reading the schematic? If I were to draw this on a bread board for you to see wire for wire would that help? The other option is that I could explain in steps exactly where to place each wire. I will work on putting this on a bread board for you to look at close up, I think that will help. If worse comes to worse I can etch you a board and send it to you but that would take a little time. We will get you to the point that you can build this for your bike, I promise you that. I will be back later with the bread board pic. :D
 
George

George

Moderator
#5
#5
Scruffneck said:
Thank you soo so so much, George! :) Oh wow, so excited!!!
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No problem, glad to help. I got the drawing started but wont get finished until tomorrow, sorry. :( I received a large shipment of electronic components today and I am trying to sort them out and get them listed. I work on yours when I need a break from taking pictures and writing listings. I am off work all week so it will get done. Have you ever worked with circuit simulators? They can be a great help when doing these projects. This is one I like to play around with at work or when I am just doing nothing, I have the app on my phone also and it has more components than the java applet. http://www.falstad.com/circuit/ I know it has 555 timer and decade counter so you should be able to play around with this circuit. I will get back to you tomorrow. :cool:
 
S

Scruffneck

New Member
#6
#6
Thanks George! I tried Eagle which I'm sure is brilliant but I'm not of the comprehension to get my head around it for now. Then I tried an online simulator which had a 10 minute expiry, seemed good but I wasn't enticed to play further. This falstad one seems great! I've just had a go before bed (it's like 4:50am here lol), will play again later... today, and hopefully figure out what happened to pin 1 (or rather muse why it needn't be there). How it portrays current flow is a real clicker, very helpful for understanding! Cool, thanks!
 
Justin

Justin

Member
#7
#7
Try this and see if it works, I did it quick and haven't looked it over 100% (More like 80%) so there could be a mistake on it (I already had to change the picture from a stupid mistake). Tell me if it works ;)



Please be aware that the values on the items may not be true because I had a hard time reading them on the diagram. That's why I have no value on the diode.
 
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Scruffneck

New Member
#10
#10
Good point! Doh! No, polyester film caps aren't, hmm neither are ceramic disc, (checking) neither are metalised polyester film, tantalum bead ARE (mostly), same as almost all electrolytic . Maplin didn't have any other 1nF capacitors anyway, I'll source one and get back here. Thanks Justin.

Ok, I hadn't posted this yet... I can't seem to find a polarised 1nF capacitor anywhere. Looked up 1000pF and 0.001uF aswell, only polypropylene, polyester, and polystyrene which are all non-polarised. I need a cigarette again! :D
 
Justin

Justin

Member
#11
#11
I contacted jimmicreesti (The guy who built the circuit) and asked him where he got his capactor. IF and when he replies I'll source back here, in case you don't find any.

You're welcome though, I like watching people build these things so one day, when I can buy the stuff I need, I can come back to these threads.
 
S

Scruffneck

New Member
#12
#12
Oh, sorry. That's so funny though. I'M jimmicreesti also. :D. I downloaded and uploaded the video myself in case it went astray (as it sometimes happens on Youtube). Originally, I found it here:

http://www.mynet.com/video/motorluaraclar/polis-arabasi-korna-siren-devresi-1470612/

and then again on Youtube after, here:

.

Quite funny, you'll see I asked already and got no reply - that was the early days. How I found it was by translating to Turkish; I also tried Polish, Bulgarian, Russian etc... only one found. Thanks for trying that route though, much appreciated! :)
 
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Scruffneck

New Member
#14
#14
Well, the drawing of the schem in that vid appears to be copied direct from this diagram, below, anyway, (I found larger version) which uses a 1mF (microFarad) capacitor.

Alas, already have I tried that :(
 
S

Scruffneck

New Member
#15
#15
Ok, so I had a little play with the most excellent falstad circuit simulator software and came up with this literal transfer of the schematic (or so I believe):

Oh, skip to 3:25 if you care to watch (the skip function hasn't worked)...


By the looks of it, in theory, something should be 'appenin. But, not that I show it in the falstad session, I got the same results by putting everything on the ONE 555 timer, i.e. out of iR1's output, and mirrored resistor setup. In both cases I tried on the breadboard and got nothing through the speaker, just 'terminal-scratch static'.

Ah well, I was already a chain smoker ;)
 
George

George

Moderator
#16
#16
Scruffneck said:
Ok, so I had a little play with the most excellent falstad circuit simulator software and came up with this literal transfer of the schematic (or so I believe):

Oh, skip to 3:25 if you care to watch (the skip function hasn't worked)...


By the looks of it, in theory, something should be 'appenin. But, not that I show it in the falstad session, I got the same results by putting everything on the ONE 555 timer, i.e. out of iR1's output, and mirrored resistor setup. In both cases I tried on the breadboard and got nothing through the speaker, just 'terminal-scratch static'.

Ah well, I was already a chain smoker ;)
Click to expand...
Where is your 1N4001 Diode that goes in series with your + input? One thing I wondered about in the schematic was the bypass around the 2.7k resistor on 555-1 at the pin 2, that takes the resistor out of the circuit and would make the resistor useless. Sorry I have not replied with the drawing, just have not had a chance. I see you are liking the sim, one of my favorites. Please take a look at the missing Diode. I will be back soon. One last thing, the drawing above shows the polerized cap as 1uF not nF, they wrote it 1mF but I think they meant micro. If you need one I have hundreds and would be happy to mail one, no charge. :)

George
 
Justin

Justin

Member
#17
#17
George said:
Where is your 1N4001 Diode that goes in series with your + input? One thing I wondered about in the schematic was the bypass around the 2.7k resistor on 555-1 at the pin 2, that takes the resistor out of the circuit and would make the resistor useless. Sorry I have not replied with the drawing, just have not had a chance. I see you are liking the sim, one of my favorites. Please take a look at the missing Diode. I will be back soon. One last thing, the drawing above shows the polerized cap as 1uF not nF, they wrote it 1mF but I think they meant micro. If you need one I have hundreds and would be happy to mail one, no charge. :)

George
Click to expand...
The confusion with the nano and micro farad capacity was in the first picture. It was so blurry I don't think neither of us could tell whether it was nano or micro.

That's something I noticed as well though but never got around posting. Where is your diode? You may want to re-look at your circuit in case you missed more things.
 
S

Scruffneck

New Member
#18
#18
OK, great news: I got something!!! :D Quite right about the diode. Am using a 1mF (or 1uF mi) capacitor, and 2700Ohm resistor from pin 2 of 555-1, no way Justin could have read that. Also, not bypassing 2700 resistor either, it doesn't make sense that.

Here's the vid: ok it's not the DAT VOICE sound yet but it's a start, and I'm happy to have a start :D Thank you both!!!

 
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Scruffneck

New Member
#19
#19
Right ok, I've not got much to play with but I tried a 2.7k R in lieu of the 11k R and it made it a higher pitch, actually reminded me of Death in "Gauntlet", just to allude my age :rolleyes:. So that's the wrong way, but this is a fun game anyhow. :)
 
S

Scruffneck

New Member
#20
#20

I'll get the 1n4001 diode later today with 1A forward voltage of 0.93V (930mV). One of the resistors on that sourced video looks much larger than on the board we're making here. I'll probably pick up some more stuff to play with... Maybe this guy modified which components he used to get the Dat Dat voice sound? If you have any hunch I'm all ears, I've no idea but thinking a 33k resistor over the 11k...
 
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