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Hi All - I'm sure everyone is familiar with the typical 5x7 dotmatrix LED displays. Particularly the ones that snap together so you can build a larger display ... I want something just like that, but with a much smaller pitch or size. All the ones I've seen look like they use the equivalent...

Hi Guys - Thanks for all the advice :) I think I'll go with an ADE7753 type for the voltage and current monitoring, using a plain old current transformer. I can get an appropriate one from Digikey for about $11.00. I'll write up the code for doing RMS first, to see if I really need the...

ScottyUK - Thanks for the tip - that series looks to be pretty easy to use. Just puts out a DC voltage that correspoonds to the RMS value of the AC being measured. Hmm, doesn't look like it does current measurement though - will still need something for that. I've been looking around at oil...

This is a cheap China Diesel, with a 295 engine. Brought in by an importer down in NC. Hardy Diesel sells the same setup, but with better accessories - http://www.chinadiesel.com . Also a lot more $$. I know I can get a simple Murphy switch setup - they have a couple of nice control panels...

Heh, yup :) Well, that's what it's capable of putting out. Keep in mind, that's only really about 83A at 120V. Most houses these days are built with at least 200A service, and larger ones with more. The furnace alone pulls 9-10A. Add in the freezer, fridge, computer, a few lights, and it...

Hi All - I have a 10kW diesel generator here that feeds into a Xantrex/Trace inverter for power backup at the house. Unfortunately, the generator is fairly simplistic in that it only has a few (lousy) analogue gauges on it, with no protection/detection circuitry at all. I would like to build...

buzzp - When you say the regulator should be able to handle this, we're referring to the clamp diode feeding into Vcc, *after* the regulator, right ? So the regulator should be able to handle having a large voltage on its' output leg. The power input stage is pretty robust. +12V and Chassis...

I'm even wondering how necessary those diodes are, since the inputs are feeding a rail-rail opamp. Also, do we really want to feed that excess voltage to the internal 5V rail ? Say a 40V spike comes along. The diodes will suddenly push the 5V rail up to 40V or so, which won't do the...

skogsgurra - Thanks for the words :) I hear you about getting all worked up with protection circuitry there. I'm going to try it with the 6.2V zeners, and if it still has a leakage problem, dump the diodes altogether. My attitude in design here has been to add things in to the layout if...

IRstuff - That's what I'm doing right now with the first board as built. Works fine. Kind of a hassle since all the calculations are off, so the calibration constants in the code are off, so .... Another option is to just do away with the zeners completely. With the 39k, the amount of...

buzzp - I'm not looking for a 5V voltage source, I'm looking to measure several signals from the car ECU. Mostly they range from 0-12V, which needs to be translated down to 0-5V for the ADC in the AVR. There's actually 5 channels of this setup ... We want to keep the resistances high so as...

Yup - that's it. I reread the datasheets, and picked up on the reverse leakage. Being so small, I've never really taken much notice of it. This is the front-end to an automotive measuring project. The divided voltage goes into an opamp voltage follower to buffer the signal, then into the ADC...

I'm missing something fundamental here ... I have a typical voltage divider circuit, consisting of two resistors, a 39k and a 22k, plus a 10k pot to adjust things. The 39k is the top leg for input, the 22k and 10k pot are the bottom leg to GND. When adjusted for about 25k, it will divide 12V...

Be careful about high currents though if you go with higher-wattage bulbs. I've seen a 9006 (9004?) high-beam plug half-melt when using 100W high-beam bulbs. Dean.

There are several remote starters on the market at the moment that will handle manual transmissions. The general technique they use is more or less as follows : 1) Put on handbrake 2) Push button x on remote 3) Remove keys (car keeps running) 4) Get out of car, close door 5) Push button y on...

Hi All - I'm thinking about designing and building a remote car starter. I know that there are lots of different ones already out there in the market, but where's the fun and learning in going off-the-shelf ? Most starters use relays, either external triggered from a smaller one inside, or...

Just waking this thread up a bit again :) No other ideas for a simple interface to a scope via gpib/488 ? D/

Pete - Thanks for the tip. printcapture looks pretty good, but it's a serial interface setup. I would need the 488<->serial interface to be able to use it. I already have the NI 488 card ... I guess what I'm looking for is a mini-Labview. A control panel for the scope would be nice, but...

For example, the 54112D has a hardcopy selection on the utility menu. Of course, selecting that pops up the error msg that there are no HPIB listeners available. So I would need something running on the PC with the NI 488 card that would act as a gateway, receiving the datastream from the...

Pete - Yup - the drivers are there. I don't really feel like churning out yet *more* code - I thought that there should be some generic front-ends available. Basic scope, basic signal gen and so on. Ah well, the whip cracks, and I hear it. Back to the keyboard. D/