You probably know that the inverter logic gate is very important in digital circuits. We have many ways to do it. Because it is easy and cheap. CD is one IC that I like to use. Sure, it will work well.

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See all Technical. Accordingly, the reader is cautioned to verify that datasheets are current before. A Cmos inverter makes a pretty distorted output because its output compesses the signal near the rail voltages.

The lowpass filter reduced the 3rd harmonic distortion caused by the compression. Thread starter Hero Start date Aug 13, Not going to near either rail should also help. First time I have seen the uCurrent being used as well. It also happens to be where the ground trace connects. The top one detects water and turns the power on. Dafasheet enough, each stage is doubled — I am guessing for better current supplying capacity at the outputs.

The bare board is made on week 17 of Rumor has it these last forever on a nine volt battery! Very cdube tear down and very in depth. Do you have any info on the buzzer, such as a part number?

The rainwater comes into quadrant III, and reaches the finished room before it gets to the drain or the sump. C2, I guess, is to even out any voltage spikes when the gate changes state? Has anyone here tried using this water alarm as more than just an alarm? You must log in or register to reply here. With sufficiently conductive fluid touching the two electrodes, the gate of Q1 gets pulled up and it turns on.

The bottom one is just a driver for the buzzer. The spec for 2N lists 1uA as a max leakage with no gate voltage. When alarm is on, the current jumps to around 11mA. Forums New posts Search forums. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Another strain relief on the battery wires to go over case plastic. Oh well, at least the part itself is connected correctly.

Hero Banned Aug 13, Could the frequency of the sound be changed to lets say 1kHz? Not much in here and sure looks like the eighties! I made some fairly low distortion 0. If they are used as a linear amplifier then they self-bias at an output voltage too low and with low gain. If installed properly with sensor facing down, there is a good inch or so of clearance before water on the floor shorts the battery- good touch.

THey have different power supply schemes and the output circuitry is different. Keep linking good, informative sources. Articles Top Articles Search resources. Electro Tech datashfet an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Trying to use a 2n mosfet to trigger an alarm panel.

Since there is no hysteresis, the alarm will shut off the moment contacts stop touching water. To participate you need to register. The design is simple and pretty clever with essentially no battery drain until triggered. Selfdischarge will probably be the main driver of that. It was fed the signal from a switched-capacitor lowpass filter IC and both were together in a feedback loop. Luckily it does not take much to make one on a design this simple. Today we have a somewhat vintage teardown.

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CMOS Hex Inverter






National Semiconductor


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