Help Me digitalized this circuit.....

Using Arduino General Electronics
1

Hey guys, this is my actual setup right now, and it works fine, but its too bulky and odd, can you help me digitalized this. This is how it works:

The LM2917 counts the frequency and when it hits its target goes high to the transistor that drives a DPDT relay, each common is connected to each coil, and the NC ones are connected to to the ignition module, the NO are grounded, so in a nutshell whe the frequency reaches its limit the coil activates and ground the coils. Be aware that it only ground the coils not the ignition module, the draw of the coils is 5.8Amp each ( the ignition module controls the current to the coils by raising and lowering the voltage through the signal pin.

I was thinking about using a NOT gate?

2

Any chance of using conventional circuit symbols so we can all read it. For example that is not the way you show an LM2917, it has way more connections than that.
Also an explanation of what the circuit is doing would be good.
Sorry but I can't make head nor tail of what you posted

3

And what's this 12V ac on the rhs?

And where's the diode on the relay coil?

4

Three videos on how to read / write basic schematic symbols.

5

Grumpy_Mike:
Any chance of using conventional circuit symbols so we can all read it. For example that is not the way you show an LM2917, it has way more connections than that.
Also an explanation of what the circuit is doing would be good.
Sorry but I can't make head nor tail of what you posted

Yeah it was kind a of a mock up, the reason i didnt gave more details its because the only part im interested its replacing the DPDT relay, the lm2917 its only there to show what activates the relay, and what the relay does. i tried using a couple of cad softwares for mac but it was a pain to get them to work.

The circuit :
Lm2917 reads the pulses from the coils, when it reaches its target goes high and activate the relay (its normally connected pins and common are a path for the ignition module to coils), when the relay activates it breaks the path of the module to coils and connects the coils to ground.-

6

MarkT:
And what's this 12V ac on the rhs?

And where's the diode on the relay coil?

Thats my "D" its 12v DC

7

Thanks pretty interesting, really appreciated was looking for something like this... i tried to use a couple of cad software and it was taking more time to draw than to build it...

8

thieaux:
i tried to use a couple of cad software and it was taking more time to draw than to build it...

Nobody minds if schematics are hand drawn instead of machine drawn. As long as they are drawn correctly.

When starting out, if you have a hand drawn schematic done, it's going to be significantly easier to use a CAD program.

9

Hi, so this circuit is for a high engine RPM cut-out, or speed limiter.

Tom....... :slight_smile: