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  1. marconi

    Smart technology a go go or a no no

    Ring Collections - https://en-uk.ring.com/collections
  2. marconi

    Best way to locate a fault in garden 12v lighting

    Did you obtain access to the T connectors - see #8. Have you taken each fitting and powered it alone from a known good psu?
  3. marconi

    Do you think energy storage system with Lithium Iron batteries is the big trend in the future?

    https://www.mining.com/web/charted-the-most-expensive-battery-metals/#:~:text=A single tonne of lithium,at the beginning of 2021. I do not think a high capacity, long life storage battery using a rare precious metal like lithium is the future because as/if demand continues to increase and...
  4. marconi

    Electronic Lock using 74LS74 DTFF

    I suggest you think first about what effect the series RC circuit of C1 and R7 has. So consider: a. What is the waveform at U2B-Q* pin 12?; b. What will the waveform be at the point where C1 and R7 join together in response to the waveform at a?; c. How does U3A's output respond - the...
  5. marconi

    Electronic Lock using 74LS74 DTFF

    https://www.electronics-tutorials.ws/logic/pull-up-resistor.html Use pull up or pull down resistors when an input has a switch connected to an input or control pin to enable 0 or 1 to be selected.
  6. marconi

    Electronic Lock using 74LS74 DTFF

    For a permanent 1 input connect direct to 5V and for a permanent 0 connect to 0V.
  7. marconi

    Electronic Lock using 74LS74 DTFF

    Some switch and push button debouncing circuits: What is Switch Bouncing and How to prevent it using Debounce Circuit - https://circuitdigest.com/electronic-circuits/what-is-switch-bouncing-and-how-to-prevent-it-using-debounce-circuit How to Switch De-bounce an Electronic Circuit -...
  8. marconi

    OSO hotwater boiler_Issue heating the water

    About the grasslin- If I have it on the constant on mode, then does it matter if the time is wrong when I switch it on? No. Top element will be completely controlled by Water Heater switch. For the flashing light, he said it’s just the neon that is not working. It is safe to use then. Would...
  9. marconi

    Electronic Lock using 74LS74 DTFF

    Unused input and control pins should never be left floating to avoid spurious operation of the logic circuits.
  10. marconi

    Electronic Lock using 74LS74 DTFF

    In your #3, is the note about C7 actually referring to C6? I can see why C6 may be required in a simulation of the circuit to reduce the frequency response of the circuit to avoid high frequency oscillation and also to progressively reduce the impact of high frequency thermal noise of one of...
  11. marconi

    Electronic Lock using 74LS74 DTFF

    Here is what a top UK university says the meaning(s) of 'a thing or two' is/are and they would not use sarcasm just as UK Collins, a reputable dictionary, did not either in the the previous link: a thing or two - https://dictionary.cambridge.org/dictionary/english/thing-or-two I would use 'a...
  12. marconi

    Electronic Lock using 74LS74 DTFF

    DPG knows a thing or two* about electronics. I don't his his field of expertise though. * see: A thing or two definition and meaning | Collins English Dictionary - https://www.collinsdictionary.com/dictionary/english/a-thing-or-two#:~:text=phrase,or%20are%20good%20at%20it.
  13. marconi

    Electronic Lock using 74LS74 DTFF

    At the rate you are learning it will not be many more years before you will be teaching me.
  14. marconi

    Electronic Lock using 74LS74 DTFF

    Nice to see discrete transistors used to make circuits. I don't know if you do it but I used to and still do take a dc voltmeter with the negative inout connected to the 0V rail and then use the positive probe to measure voltages at various points of the circuit in order to imprint in one's...
  15. marconi

    Electronic Lock using 74LS74 DTFF

    https://www.jameco.com/Jameco/workshop/TechTip/555-timer-tutorial.html Have a look at figure 6 in the link above. I reckon you ought to be able to work out a way to use this 555 monostable circuit to do the work of S53 to clock the final flip flop. And the 555 RESET input set LOW to inhibit...
  16. marconi

    OSO hotwater boiler_Issue heating the water

    What is your district in Liverpool so I can make some enquiries about forum electricians in your area? The items I have highlighted in bold are what you need to address with the electrician. The flashing orange light is not right. Please leave that switch turned off for now. It needs an...
  17. marconi

    OSO hotwater boiler_Issue heating the water

    Nicole_ I hope you are just busy and not that you are tired of all my questions ;-) I want to give you some questions for an electrician to answer once he/she has visited and inspected what's what - because there will need to be a visit paid for by your landlady. But just need a little more...
  18. marconi

    OSO hotwater boiler_Issue heating the water

    Do the hands of the Grasslin timer switch show the correct time? At the moment the picture you sent of it shows it on in these periods when timer mode is selected and the correct time is set on the hands: 1000-1200 1800-2030 2130-2230 2330-2400 (You may have changed these times in which...
  19. marconi

    OSO hotwater boiler_Issue heating the water

    From what you said in your last message it looks like the Night Immersion Switch is faulty or there is a loose connection. When you played with the night immersion switch did the orange light illuminate?
  20. marconi

    OSO hotwater boiler_Issue heating the water

    Thank you. I will reply today Tue 28 Mar 23.

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