Recent content by bikeNomad

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    CPF-LOGGER-Lite: Simple DIY Data Logger for CPFers

    Re: CPF-LOGGER-Lite: Simple DIY Data Logger for CP [ QUOTE ] pbarrette said: Hi all, When I sourced the SMT components I did my best to keep the prices low and the sizes high. I know that some of you don't do much soldering with SMT components, so that was a factor in the Digikey sourcing...
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    Help: Any open source simple ATMEL project flashl

    Re: Help: Any open source simple ATMEL project fl [ QUOTE ] koala said: bikeNomad there is ways around the "C and no RAM" problem Is it really impossible to program the ATtinyXX in C? Programming Atmel ATtiny15L Using AVR-GCC I haven't try it yet, I don't really program uP in C, I prefer...
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    Help: Any open source simple ATMEL project flashl

    Re: Help: Any open source simple ATMEL project fl [ QUOTE ] kingkong said: hi, I was wonder if there are any open souce AVR atmel flashlight project. I can do the software part, but I am not very good at EE part. I am currently looking at ikroll source, but I could not figure out the...
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    Who makes the best Bike Light ??

    NightLightning is a NZ company I just found out about (someone responded to my query about a 3x 3W LED bike light head). They have a 3x 3W Luxeon head and seem to be very DIY-friendly, selling kits and parts too. They also supply regulated halogen units and various battery packs, including...
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    Off-the-shelf head for Fraen 3x 3W bike light?

    Re: Off-the-shelf head for Fraen 3x 3W bike light [ QUOTE ] rwolff said: You'd probably need a bit more heatsinking than the head assembly provides, but the Futailite web site (they make the famous "Costco 2xAA Luxeon twinpack" lights) shows a triple Fraen optic light using 1W Luxeons. It's...
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    adjustable low voltage cutoff with automatic reset

    Re: adjustable low voltage cutoff with automatic r Depending on the cutoff voltage you need, it may be easy to use one of the "power supply supervisor" chips like the DS1233AZ-10 (which I happen to have 200 of for some reason) to monitor voltage against a fixed cutoff (in the case of this chip...
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    Need help with microprocessor control, selection

    Re: Need help with microprocessor control, selecti [ QUOTE ] NewBie said: Look at Atmel's app. notes for battery chargers and power supplies. I posted links in the microprocessor thread to that and much more. [/ QUOTE ] Note that if you actually try to build the circuits that they describe...
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    Need help with microprocessor control, selection

    Re: Need help with microprocessor control, selecti [ QUOTE ] billw said: The AVR tiny series is a pretty good compromise in price, performance, and availability. The ATtiny11 can be obtained for $0.25 to $0.50 each, which is phenomenal (but it's a relatively icky chip.) [/ QUOTE ] I agree...
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    Quickie 4-Luxeon microscope light

    This has gotta be one of the simplest light projects ever. I needed a quick way to light my work on my Bausch and Lomb zoom stereo microscope. Four Luxeon 1W Star/O units and some foam tape to the rescue! A photograph through the lens (it actually looks much better than that using my...
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    Help me choose a PC oscilloscope

    If you're working with switching power supplies, you want a pretty fast scope. When using a digital scope you want a sampling rate at least 5x the highest frequency to be measured, in order to get a good representation of the waveform being sampled. Imagine, for instance, the 10nsec risetime of...
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    A 3-component LDO current regulator

    Actually, the part is able to put out quite a bit of current. At 5V in and 3.7V out, it can put out more than 900mA before it starts to thermally limit. Assuming an ambient temperature of (say) 40C, and 100C/W (a guesstimate for that little board mounted to a heatsink, since they say that a...
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    A 3-component LDO current regulator

    I've been looking at Linear Tech's LTC4059 tiny little 900mA battery charger chip (LTC information) and it looks like this might actually be a simple way to get a low-dropout current regulator in a very small package. And it's easy to put this on a single-sided 10x10.5 mm board (or...
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    Off-the-shelf head for Fraen 3x 3W bike light?

    I'm building a bike light from 3x 3W Luxeons and a Fraen triple lens. My prototype is a bit heavy (you can see a photo here) and not very well mounted. It is very well heat sunk, though! It's a bit of a custom job anyway, since it's going on the headset of my recumbent bike: but I'd like to...
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    Cheap source for Fluke DMM fuse?

    I drove down to Fluke's office to pick one up (it's about 30 minutes from where I live). It was about $11 as I recall too. You could just call them and get them to send you one. If you're in the US, you can call them at 1.800.526.4731 They also have an online store at...
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    Do 10+ watt boost converters exist?

    Generally speaking, you can add a current sense resistor and amplifier to a switching voltage regulator and get a constant current regulator. However, you may have loop stability problems driving LEDs because of their nonlinear impedance. Luckily, you can heavily damp the control loop if you're...
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