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  1. WHONOES

    Wind Detecting Circuit

    My nose generally tells me when there is a bit of wind around.
  2. WHONOES

    Lead acid battery

    You need to limit the charge current to no more than 25% of the battery's capacity otherwise you will cause irreparable damage. It will overheat and may explode.
  3. WHONOES

    Lead acid battery

    Charging a sealed lead acid battery is done in a particular way. It is a 3 stage process. It starts with constant current charging then it switches to constant voltage charge then when charge current drops it switches to maintenance mode. This sounds horribly complicated but it's not. The...
  4. WHONOES

    question: car amplifier at home (diy)

  5. WHONOES

    Maximum Voltage in passive capacitive circuit

    Agreed. But stray capacitance can make itself felt and is not so easy to ignore.
  6. WHONOES

    Maximum Voltage in passive capacitive circuit

    Being a little pedantic, a circuit without inductance does not exist. That is also true of capacitance.
  7. WHONOES

    question: car amplifier at home (diy)

    Partial details for the drivers that you mention are available on their website and they even give a range of cabinet volume dimensions that could be used but the one detail they do miss out is port dimensions which are quite important so is not a lot of use. The better option as AG suggests is...
  8. WHONOES

    question: car amplifier at home (diy)

    It is quite feasible to correctly load your speaker in a properly designed enclosure to get the bass extension you seem to desire. You just need the T/S data and the appropriate sums.
  9. WHONOES

    Advice about MC34063 based buck converter diagram

    Try the attached circuit. It uses a 555 timer + some other bits. It runs at about 112KHz which means that you can use a smaller inductor. Come back If you want to try it and need more info. Also see the graph which shows outputs. The Blue trace is the O/P volts, the Red trace is the switching...
  10. WHONOES

    Adjustable current souce 12Vin 400mA o/p 32W

    Possibly. I like using the venerable 555 for switching supplies. If indeed you need to drive 400mA into 200Ω then you will need 80V. I will have a bash at some simulations to see what may work. It might be a straight forward switching boost converter or something with a transformer in it. Either...
  11. WHONOES

    Adjustable current souce 12Vin 400mA o/p 32W

    Are you able to build circuits from supplied schematics?
  12. WHONOES

    Switching Current Spikes?

    What exactly are you trying to do?
  13. WHONOES

    Adjustable current souce 12Vin 400mA o/p 32W

    Bearing in mind *STEVE's* reply, it is feasible but you may well have to use something designed for purpose.
  14. WHONOES

    Door Bell Chime Transformers - UK

    Low power mains transformers tend to have poor regulation and have a tendency to run a bit warm. It is down to core and copper losses. Can you measure the temperature of the core?
  15. WHONOES

    Increasing Battery life Question

    You are spot on with your observation.
  16. WHONOES

    Dimming an over bright LED

    I realise it may be beyond your ability but, the way to vary the intensity of and LED is to use PWM (Pulse Width Modulation) in concert with a fixed voltage supply and current limiting resistor. Such devices are available via E bay for not very much money.
  17. WHONOES

    PCB Design, 12V@N*0.6A, traces, how can i make this work

    You could even use multiple layers to improve current density.
  18. WHONOES

    Buck Converter with PİC16F877A

    At the risk of attracting ire from the other contributors, may I suggest that you. 1) Replace Q1 with an IRF9540 which is a P channel device. 2) Connect the source of Q1 to +24V and the Drain to the top of R3. 3) Delete D2 and C4. 4) Connect the top of R2 to +24V. 5) Insert a 1K resistor in the...
  19. WHONOES

    Isolating electric shower

    Have a pump fitted between the hot tank and the shower also the incoming cold supply for the shower as well. Works perfectly. And I live on a hill.
  20. WHONOES

    Any expert in radio-controlling drones ?

    Call me suspicious, but why do you want to switch something on and off at a range of 1 mile?
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