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Hi, I recently acquired a MTD 2003 Stepper driver IC. I want to use it with a picaxe to drive a stepper motor (duh), but I can't fully understand the datasheet. I understand most of the inputs, except: where do I connect the power for the stepper motor (12V or 24V). PIN27 seems to be connected...

Okay, first of all - I'm a complete idiot (or maybe lack of food today made me one) - that voltage drop was because I forgot to reconnect the power supply to Pin14 after adding a 100nF cap. 1. Can't really get a schematic, but this signal goes to the cluster and is used to drive the tacho...

I finally got it to work. What I have now is a 1M pull-down and 1nF on the CLK pin. Signal is connected directly to the CLK. Without the 1nF I get pretty much random output, it seems to pick up on noise. The thing is that if I use ANY resistor in series with the signal - I get no trigger or...

Thanks, that helped! I added a 100uF cap (the only ones I had here in garage) to the supply rail and removed those 1n caps. It looks like it's working well - RPM readouts are pretty close to what I would expect to see (idle is at around 500RPM, which is close to what it should be). The only...

From what I've seen it looks like the tacho signal comes from each ignition coil - it's tied high (at 13V) and goes to 0V each time the coil gets grounded to fire the spark-plug. The width of that pulse is the same no matter the engine speed. I will upload a screenshot later to explain it...

Hi. I'm trying to find the best way to quickly output one pulse after receiving two pulses with a 08m2. I'm building a circuit for my car's tacho. 4 cylinder engine was replaced with an 8 cylinder engine and the tacho is reading double the RPM. The tacho signal is a square wave tied high...