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    Soldering and replacing SMD LEDS

    Mostly, however when working with any pcb, one can never have too much flux. Paste best applied liberally.
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    Are There 3 Volt MultiMeters?

    Your being a beginner, pretty much any $10 multimeter would suffice, digital would be easier for you to read. No reason for 3v supply meter in your request info.
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    Help identifying a capacitor

    That's a crystal for the uC. Brown gunk is, as you say "stuck" ....that's probably as it is actually glue. Time to look else where for whatever problem you have. Although I'd say with that particular shot, the green and gold cap I mentioned before, does have the top swelled. Best replace that...
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    Help identifying a capacitor

    If you mean the green and gold cap, it will have the details written on it. However, looks ok to me from here.
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    Convert 220Vac to 300Vdc 50amp

    I think you mean 1kva....and 5kva ...BUT....neither will give you 50a.
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    Z80-Based Project Ideas

    Could look at things like where I started out........ https://cyberneticzoo.com/cyberneticanimals/1979-rodney-self-programming-robot-david-l-heiserman-american/
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    Z80-Based Project Ideas

    No, I understand completely.....and reply above still applies. If you want to get a simple understanding of analog devices and programming of same, then perhaps start with Arduino systems, which are or at least mostly are, independant (depending on what you perceive as independant) They also...
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    Z80-Based Project Ideas

    Plenty of source information out there on the internet as it's been going now for over 50 years. Some have re-furbished the older Z80's and some have used things like Rasberry Pi to do the same processes. Plenty of ideas out there also and with details that will make everything much easier to...
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    whats the difference between 1 terminal power and 2 terminal power in falstad?

    Whatever it is you are on, I'd suggest you give it a miss as it is clearly messing up any cells you have left up top.
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    Why nc is not linked to com during delay for time relay?

    One has to wonder why you didn't do this originally.
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    whats the difference between 1 terminal power and 2 terminal power in falstad?

    I think it's time you gave some serious thought to taking up fishing or playing bowls as you just seem completely unable to grasp even the simplist basics.
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    whats the difference between 1 terminal power and 2 terminal power in falstad?

    As in #10 above....:rolleyes:
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    Need help finding new(old) capacitor or equivalent, please

    Show the details.....
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    Why nc is not linked to com during delay for time relay?

    Certainly correct...when I posted the link there was a complete spec detail section at the bottom....gone now. That's Ebay for you...:)
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    how can i programme some apollo smoke detectors with xpert card (Kentec Electronics Ltd)

    Quote from specs....as I said, you'll need the interface supplied from the manufacturer. ADDRESSING AND COMMUNICATIONS Each XP95 device responds to interrogation and command from central control equipment. It communicates to the panel information on status, command bits, type, location, and...
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    Why nc is not linked to com during delay for time relay?

    Some specs here....Sooooo hard to find ....first on Ebay....DOHH !!! ....Op is talking through their hat ....... https://www.ebay.com.au/itm/385468618122
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    whats the difference between 1 terminal power and 2 terminal power in falstad?

    In the real world where most of us reside, a circuit requires at a minimum, 2 conductors to complete. In nearly all instances, one is tied to the chassis.
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    Need help finding new(old) capacitor or equivalent, please

    https://au.rs-online.com/web/p/aluminium-capacitors/1740536
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    reduce volume of quartz wristwatch beep

    Stick it in a cupboard drawer.....conversely, in a tin on the mantle piece will probably make it seem louder.
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    how can i programme some apollo smoke detectors with xpert card (Kentec Electronics Ltd)

    https://ampac.net/products/xp95-addressable-detection/ bit extra info above......as suspected, the "tag" with the number is the address tag for each device. The address must be able to be extracted with some additional interface or monitor. Suggest you get onto the manufacturer or sales rather...
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