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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I still need to test the prox switches, dew controller, and relay drivers. The time now is The All Things to All People controller. Given the costs I’m working here I’m expecting shipping will cost about half as much as the entire project so I’m trying to avoid multiple sources for components.

You might get some P channel low on rds capable for the current drain in the SO8 packages though, but you lose the intelligent fet I shutdown, all depends on what you want.

BS170 MOSFET. Datasheet pdf. Equivalent

Hi Garbz, On my scope, a 10″ LXGPS, I have the dew heater just behind the corrector plate which appears to be the best location, and the idea is that the heat going into the tube and slightly heating the back of the corrector plate, airstops the dew from forming on the front.

Originally Posted by redbeard. Have attached piccies of a unit i made up for fun that could a Have one DewHeater channel controlled via several means including using dewpoint, defined PWM duty cycle or auto temp delta mode.


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 strategy is to estimate the pwm value linearly for setpoint temperature and dither either side to maintain temperature.

A correct snubber can help. Last edited by Garbz; at I don’t want to hijack your thread – strictly amateur stuff.

Touch this against any part of the mount earth then there is a short cct to earth. You talking about actual radio noise being emitted every time the FET switches? A bit beyond my skills. Yeah low on Rds is vital this is why most people use N channel fets Originally Posted by mswhin63 Another really really cool platform is the PSoc4 platform which as a brilliant IDE that is component based and I believe super easy to develop.

Changes in ambient air temperature are used to recalibrate pwm values – avoiding high, low switching. One disadvantage I found which will have an affect more on Arduino platforms is the integer based calculation quickly use up 8, 16 and 32 bit integers. How to measure Current with a Pic I guess I don’t fully understand this concept. Hi, If it is only an overload protection Some of the development boards I have a super powerful and nice to program plus unusually cheaper than Arduino.

However saying that the commercial straps have metal connectors datassheet me reassess this. Any floating point operation is very expensive on an Arduino or AVR as they don’t have a floating point arithmetic unit unlike say the CPU in your computer.

How to measure Current with a Pic. Originally Posted by rcheshire. Mexico city MelbAustralia Posts: So much simpler than dealing with low-value shunt resistors. Find all posts by rcheshire. If I have a load of 20 amps then with a. I figure this will permit a wide range of customisation. I was hoping to use it to update progress. I guess I’m missing something simple. So the best platforms are high speed 32 bit processors now. Find all posts by wasyoungonce.


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

Also some plastic RCA connectors have exposed parts of the shield. It doesnt come on till you get within a set delta from the dewpoint. Find all posts by AndrewJ. For efficient code you want to as avoid using any floats single or double which means no decimal places and avoid performing any math which results in a division that has a decimal place.

You can verify this is happening by putting 5V at the gate continuously and measuring the voltage from Drain to Source.

Hi Chris, most excellent work Huh why can’t I edit my original post That is good stuff. Originally Posted by Garbz A double is still a float, just a double precision float is 64bits long instead of 32bits. Overshoot and ringing are a side effect of a crazy fast switching response which is usually the result of wanting to waste as little power as possible in the MOSFET.

BS MOSFET Datasheet pdf – Equivalent. Cross Reference Search

I estimate it takes several seconds to indicate an increase in temperature of the cold finger. Datahseet that’s not quite true, the advantages of lowside vs highside switching were mostly eliminated when I added the driver IC.

I generally use the output stage Mosfet RdsON as the shunt

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