Hi, sorry to do a post asking for help for my first.. I've come across this forum lots of times in the past when looking up electronics and you all seem very helpful so I thought I'd give asking you a direct question a shot!
Basically I'm trying to make a mod for my motorbike. The aim is to have a couple of high output (~1W) UV LEDs buried in the engine that pulse with a speed related to the revs. I want it to be most effective from 2000-1000rpm and was thinking a minium period of 0.2s means one pulse to LEDs per 34 revs of the engine.
I've tapped the tach lead, ground and 12V from the wiring loom. From what I've found out so far the tach lead outputs a square wave pulse at >10.5V - I have no oscilloscope to test this though
Also I have confirmed that there is a pulse the goes to the coils twice every rev - so I may be able to get a pulse going double the speed of the revs also. Apparently this is where aftermarket rev counters usually attach to.
Having got my pen and paper out I've identified a few parts for the circuit -
Signal In (got that, don't know what it's outputting exactly but got it!)
Pulse Count (I'm thinking I need something that'll send one pulse per 34 in - perhaps double this though if the signal is different. It would be good if I could vary this one way or another)
Pulse Out (I realise that I'll probably get a square wave out of whatever counter I'm using, so want to change that to, ideally, a quick build, slow fade - could be done with cap that uses different values of charge/discharge resistors maybe? A sine wave or triangle wave would do in a pinch though)
LEDs (I've found some 1W UV LEDs, want to drive 2-4 of these)
Any help would be much appreciated! Please ask away with any more info you need.
I know this post is already very long-winded but here's a little of my background if ye want to read it -
Been playing around with electronics for a lot of years, but always end up hitting a brick wall of my own stupidity Comfortable with a soldering iron but circuits quickly go over my head. Did a year of practical electronics as part of a design degree, which brought me on a bit (I can read datasheets)
Latest time was building my little proof of concept LED pulser (read: following diagrams) and trying to get my head around it. I understand how a op-amp makes a square wave, but can't understand how it makes a ramp voltage or sine wave, argh.
Played around with lasers for a bit and built a couple of drivers for those (don't wanna fry yer diodes) using a Vreg IC. Recently came back to them, built a current reg, and voltage reg - both work fine on their own. Can't connect them together. I'm sure there's a very simple reason for this but it's one I can't get!
Anyways, that's more than enough writing.
Basically I'm trying to make a mod for my motorbike. The aim is to have a couple of high output (~1W) UV LEDs buried in the engine that pulse with a speed related to the revs. I want it to be most effective from 2000-1000rpm and was thinking a minium period of 0.2s means one pulse to LEDs per 34 revs of the engine.
I've tapped the tach lead, ground and 12V from the wiring loom. From what I've found out so far the tach lead outputs a square wave pulse at >10.5V - I have no oscilloscope to test this though
Also I have confirmed that there is a pulse the goes to the coils twice every rev - so I may be able to get a pulse going double the speed of the revs also. Apparently this is where aftermarket rev counters usually attach to.
Having got my pen and paper out I've identified a few parts for the circuit -
Signal In (got that, don't know what it's outputting exactly but got it!)
Pulse Count (I'm thinking I need something that'll send one pulse per 34 in - perhaps double this though if the signal is different. It would be good if I could vary this one way or another)
Pulse Out (I realise that I'll probably get a square wave out of whatever counter I'm using, so want to change that to, ideally, a quick build, slow fade - could be done with cap that uses different values of charge/discharge resistors maybe? A sine wave or triangle wave would do in a pinch though)
LEDs (I've found some 1W UV LEDs, want to drive 2-4 of these)
Any help would be much appreciated! Please ask away with any more info you need.
I know this post is already very long-winded but here's a little of my background if ye want to read it -
Been playing around with electronics for a lot of years, but always end up hitting a brick wall of my own stupidity Comfortable with a soldering iron but circuits quickly go over my head. Did a year of practical electronics as part of a design degree, which brought me on a bit (I can read datasheets)
Latest time was building my little proof of concept LED pulser (read: following diagrams) and trying to get my head around it. I understand how a op-amp makes a square wave, but can't understand how it makes a ramp voltage or sine wave, argh.
Played around with lasers for a bit and built a couple of drivers for those (don't wanna fry yer diodes) using a Vreg IC. Recently came back to them, built a current reg, and voltage reg - both work fine on their own. Can't connect them together. I'm sure there's a very simple reason for this but it's one I can't get!
Anyways, that's more than enough writing.