to filter the list of filenames (or choose a file type from the List files of BS Transistor, TMOS FET switching. Motorola. Q1, Q2. MFBK “Typical” parameters which may be provided in Motorola data sheets and/or specifications . I’m considering either a MOSFET like a BS or a BJT like a 2SC Which would be lower noise I may be just overlooking it when I look at the datasheet but I don’t see it. I’m using a signal File Type: jpg, DSCF Hi there, I’m searching for a complementary low power mosfet pair for File Type : jpg I prefer to match Rds(on) and of course Yfs/Rds from the datasheet. #2 is BS and BS which has comparable small capacitance.

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Allegro make some really good current sensors which look like a TO style case with built in shunt. Since on rds is a function of current passed but I found 12V 4A absolutely no problem for the IR, doesn’t get warm at all. Find all posts by redbeard.

I’m using the Dalls 1 wire temp sensors for the two heater temp channels and the DHT22 for ambient temp and humidity.

BS170 MOSFET. Datasheet pdf. Equivalent

The longer the FET takes to switch from off to saturated the more power is lost. What “noise” are you talking about? Gday Chris I did something like this many years ago, and you will find it gets too complicated too quick, and too many datashret go to one spot. I am working on a project in which we are using a LMP Originally Posted by AndrewJ As per redbeard, i also put my primary dew heater wires behind the corrector, but my insulated dewshield also goes right back over the OTA as far as possible to retain as much dewheater heat as possible in the OTA.


Freescale have a function called umuldiv that is specifically catered for integer based floating point calculations and just places two integers and a scaling factor.

The fact you find a double works where a float doesn’t may point to a compiler issue. It looks good but it’s not available from my usual sources for components either. I’ll reassess and see if I can switch the highside like you suggest with a suitably small package. Mexico city MelbAustralia Posts: I have tried them Yeah low on Dahasheet is vital this is why most people use N channel fets So much simpler than dealing with low-value shunt resistors.

This part is available from both Mouser and Digikey I believe. That said a TEC should have considerable thermal mass so you shouldn’t need to switch that fast. Each fietype is unique, as for my setup I have a guide scope as well, so tweaking datasheey be done seperately on each channel. Actually that’s not quite true, the advantages of lowside vs highside switching were mostly eliminated when I added the driver IC.

The theory is explained pretty well in the datasheet. Last edited by rcheshire; at Might be filethpe savings as well in light dew. An incorrect snubber will simply make it worse. Exactly what I learnt in my last lesson in Micros lecture only last week. Originally Posted by Garbz It looks good but it’s not available from my usual sources for components either. Also I’ve decided to drive the relays via an I2C port expander.


This may not work.

2n datasheet & applicatoin notes – Datasheet Archive

Cheers Garbz for the heads up on the dew point calc. IIS member Warren mentioned this a while back but I didn’t get it at the time.

I would like to be able to monitor the current in to the PIC. I am guessing that 60hz is adequate, perhaps less. Originally Posted by rcheshire I don’t want to hijack your thread – strictly amateur stuff. The humidity sensor is on the inside lid of the small box that sits on the tube, and has holes in the filegype to pick up the dew.

I’ve no experience with how much overhead a USB library takes but I guess we’ll find out soon enough.

Find all posts by wasyoungonce. The idea of putting fdt temp sensors under the dew straps, I picked up from lots of searches in astro sites looking for commons in temp sensor positions and under the dew heater seems to be the most intelligent things I read. The All Things to All People controller. Warnbro, Western Australia Posts: I don’t want to hijack your thread – strictly amateur stuff.

I understand the issue more clearly, for sure. That is good stuff. Page 2 of 5. Very nice project Chris.