July 4, 2020 0 Comments

CDUBE from Texas Instruments at low prices and same day dispatch! Orders above £20 Technical Datasheet: CDUBE Datasheet. See all Technical. CMOS Hex Inverter. DATASHEET .. Accordingly, the reader is cautioned to verify that datasheets are current before . 1/6 CD IN. OUT. CDUBE ti CDUB, CMOS Hex Inverter Data sheet acquired from Harris Semiconductor SCHSC Revised September The CDUB-Series.

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Today we have a somewhat vintage teardown. Rumor has it these last forever on a nine volt battery! This alarm has a pretty simple task- sit somewhere quietly and watch for water leak. The design is nicely compartmentalized, with separate areas for sensor wiring, battery and electronics.

Note strain relief loop around the plastic post. 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. Not much in here and sure looks like the eighties! The bare board is made on week 17 of Another strain relief on the battery wires to go over case plastic.

Nice attention to details. CD is so old, the datasheet is still from Harris. The part runs from 3 to 18V, allowing direct operation from the 9V battery. It appears Source and Drain are swapped in silk.

CDUBE datasheet & applicatoin notes – Datasheet Archive

It also happens to be cd4069uve the ground trace connects. Oh well, at least the part itself datazheet connected correctly. None of my meters could resolve it even when in uA range.


No wonder these things last forever on a battery. And now on to the schematic. Luckily it does not take much to make one on a design this simple. I drew the chip U1 as seven parts for clarity: What we have here is two essentially independent sections.

The top one detects water and turns the power on.

Since there is no hysteresis, the alarm will shut off the moment contacts stop touching water. The bottom one is just a driver for the buzzer. Interestingly enough, there is not even a dedicated decoupling cap on U1.

CD4069UBE Datasheet Download

It just shares C1 with the rest of the board. With sufficiently conductive fluid touching the two electrodes, the gate of Q1 gets pulled up and it turns on. Q1 along with the forward drop of D1 determine minimum voltage the circuits operates at- around 4V, well beyond a typical 9V battery end of life.

While in standby, the only power drain is the leakage through C1 and Q1. But at room temperature and at least on this unit dataseet was cd4069hbe nA. The spec for 2N lists 1uA as a max leakage with no gate voltage. When alarm is on, the current jumps to around 11mA. The buzzer driver cs4069ube the six inverters to create an oscillator with a frequency of around 3.

Interestingly enough, each stage is doubled — I am guessing for better current supplying capacity at the outputs. The design is simple and pretty clever with essentially no battery drain until triggered. There is no battery low indicator, but at such a low drain it will take years for datasgeet battery to need replacement.


Selfdischarge will probably be the main driver of that.

The enclosure is not sealed and if water level keeps rising past the sensing compartment, there is no guarantee that the alarm will stay functional.

Very nice tear down and very in depth. Its great you even were able to build the schematic from it. First time I have seen the uCurrent being used as well. I need to get one of those.

Trying to use a 2n mosfet to trigger an alarm panel. R1 keeps gate of the FET pulled low, to keep it off. C2, I guess, is to even out any voltage spikes when the gate changes state? Could the frequency of the dstasheet be changed to lets say 1kHz? The rainwater comes into quadrant III, and reaches the finished room before it gets to the drain or the sump. Thanks cd4069uube the teardown. Do you have any info on the buzzer, such as a part number? Your email address will not be published.

The sensors could be local, or remote using supplied wire. Board back- all throughole. Has anyone here tried using this water alarm as more than just an alarm? Leave a Reply Cancel reply Your email address will not be published.