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    Backup battery charging

    Sounds ok. What sort of range difference were you referring to though. E.g. What size are your 6v batteries and what max output of the charger? You need to size you output on this and the actual load as well. There are some really nice "smart" units around these days.
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    What circuit makes a HIGH by detecting LAST pulse

    Elcheapo sensors from Ebay are around $15 so I would not call that expensive. No need to add anything to the sensor as in your application. you require the sensor to retrigger with every movement so set pir timer to say 20 minutes and it will retrigger with every movement and keep out put high...
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    Tektronix 2430a ram chip question

    You might be overreacting as to the importance of this battery backup chip ( if it does indeed even exist on your model) I saw reference to it in the first manual but not inthe "a" model. It said expected lifespan was 3 years. Now I cannot imagine a company like this releasing a test meter that...
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    Tektronix 2430a ram chip question

    You provided a model number which was all I could go by so if yours is different again then perhaps you could have stated that a bit earlier on. Would have saved some unnecessary searching and deciphering.
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    Tektronix 2430a ram chip question

    It looks like they are different and the chip number and the method of Nonvolatile arrangement may also be different. Manual here................ https://www.tek.com/manual/2430a-service-manual u664? page 365
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    Tektronix 2430a ram chip question

    All may not be lost. I found this service manual (link below) and according to it, (in the service calibration section) replacing the NVSRAM involves doing a "cold start". So from that I deduce that you may not need any external reader/writer. Anyhow, see what you think. I believe I have the...
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    Tektronix 2430a ram chip question

    Fair enough but if there is a memory error showing, would transferring existing memory into a new device still end up with the same error. Or is it just signalling that the battery is low? If the latter, then leaving the unit switched on and replacing the power module (if fitted) should be all...
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    Tektronix 2430a ram chip question

    Never seen a battery in a chip before.
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    Source for replacement resisters

    You could use 2 metal film resistors. 8.2 ohm and 0.3 ohm in series or if low wattage a preset pot and adjust to required level. https://www.jameco.com/z/64Y100-3296Y-1-100--Spectrol-Vishay-Corporation-10-Ohm-3-8-Square-Cermet-Potentiometer-25-Turn-1-2-Watt_240338.html
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    PirSensor

    Any heat changes really. Depends on sensitivity as to how the relay reacts. For example they can be upset by trees blowing in the wind. Way back when, there was the story of the spider that somehow deducted that certain movement would trigger the relay and as a result, turn on the light which...
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    PirSensor

    Might be more suitable to use an LDR or an ultrasonic sensor.
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    Capacitor charging itself?

    The atmospheric pd was originally used in sensors for autopilots. If I remember correctly the Israelis produced some of the first. I clearly remember it as there was one hell of a hallabalu over the fact that the sensors contained minute radio active particles, probably much like some of the...
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    Capacitor charging itself?

    With Harald's suggestion in mind, there migh be a connection between the original teachers request and the fact that there is a pd in the atmosphere.
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    CURRENT FLOW vs ELECTRON FLOW

    Just stick with conventional current direction ie from positive, out through the circuit and back to negative of the supply. For your second query, If you look at a split power supply having for example +12v...0v ....-12v it is the measurement with reference to the 0v rail.(remember reference...
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    Help to identify this IC

    RT possibly Richtek
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    Monitor with inttermittent power.

    I can't wait to see what comes next
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    Logic mosfet pwm

    No, regulator is being driven from 5.1v supply. Not a real brilliant drawing though. Hope the 5.1v is not from the Arduino regulator.
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    BUCK switching waveform ... problem

    So am I reading this correctly? You have a 26mv spike lasting 2.5usec? What is the load?
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    BUCK switching waveform ... problem

    What is it like on the other side of the inductor?
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    IR: Custom Messages

    Hi Nate, It is always helpful to supply things like a link to your project so others can see what you are dealing with. I have an inkling you may be jumping in midstream instead of doing it from the start, hence the confusion on your part. However, I took a quick peek on Github...
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