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A switched capacitor (SC) is an electronic circuit element implementing a filter. It works by moving charges into and out of capacitors when switches are opened and closed. Usually, non-overlapping signals are used to control the switches, so that not all switches are closed simultaneously. Filters implemented with these elements are termed "switched-capacitor filters", and depend only on the ratios between capacitances. This makes them much more suitable for use within integrated circuits, where accurately specified resistors and capacitors are not economical to construct.SC circuits are typically implemented using metal–oxide–semiconductor (MOS) technology, with MOS capacitors and MOS field-effect transistor (MOSFET) switches, and they are commonly fabricated using the complementary MOS (CMOS) process. Common applications of MOS SC circuits include mixed-signal integrated circuits, digital-to-analog converter (DAC) chips, analog-to-digital converter (ADC) chips, pulse-code modulation (PCM) codec-filters, and PCM digital telephony.

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  1. Chris2023

    Will water run through a switched off boiler.

    Long story short I have a leak from possibly the flexi hose that connects to the upstairs hot water tap. I've switched off the boiler and mains water and waiting on a plumber but not sure when they'll arrive. My question is if I leave the boiler off and then turn the water back on so I can use...
  2. plumberhelp!

    Why does my HW come on with CH even when switched off!

    Our Potterton EP2 was old and the sliders for HW/CH were loose. We couldn't get CH without the HW on! So I put a new digital EP2 on. It fit over the old backplate : no wiring required! What I found then was that if I put HW on with the slider then fine - digital display come on "Hot Water" and...
  3. J

    Air in central stem when hot water is switched on

    Replaced Grundfos Ups 2 C/H pump with a Ups3. when c/h only on no problem as soon as h/w is on as well gurgling and air in system experienced, also hot water coming out of 22mm vent into expansion tank ( doesn't happen when only c/h is on) so bad that h/w must be turn off. I had no problem...
  4. J

    Why is radiator in hall no TVR hot when boiler is switched off

    Radiator in hall has no TVR, thermostat on hall wall set to frost protection and boiler set to hot water only, however radiator in hall is producing heat? Why is this and why needs to be done to solve issue?
  5. J

    Glow Worm Micron 120 No Switched Live (Boiler Help)

    Hi All, New to this so not sure if posting this questions is valid, but i have a boiler issue which has baffled me. I have a Glow Worm Micron 120 boiler and it recently decided to die all of a sudden. I have had issues with the PCB in the past i.e i resoldered some dry joints a year ago. Thus...
  6. B

    Radiator still warm when switched off

    Hi all, newbe here. Just replaced a o ring on the ideal isar he30 boiler diverter valve manifold and all went great but now the boiler displays 0 on the panel but the radiators are still getting warm when switched off. Has anyone got any ideas what is going on, cheers,
  7. IaninHull

    What is the difference between switched live and open therm?

    Hello all, Apologies A) for showing my ignorance and B) possibly asking a question that has been answered elsewhere - though I have looked! I have a problem with the heating on a pub I have taken over. The boiler has been recently overhauled and works fine, but I'm struggling to control it...
    • IaninHull
    • Thread
    • america between difference live switched switched live usa
    • Replies: 2
    • Forum: USA
  8. M

    C/H pump not working unless HW is switched off

    My system comprises a Kingspan 180L unvented hot water tank, Danfoss FP715si controller and a Bosch Worcester Greenstar Ri boiler, which works perfectly as far as I can see (and is serviced by BG every year). The problem is that the CH pump will only start if I switch the HW to manual, if they...
    • masonmjs
    • Thread
    • america not working pump switched unless usa working
    • Replies: 25
    • Forum: USA
  9. C

    No switched live to boiler?

    Hi for a few reasons (problem with hot water, possible smart heating installation), I familiarised myself with my heating system and wiring. Looks like a standard S-Plan with magnetic valves for hot water, central heating and UFH. Valves are controlled by normal standard backplate programmer...
  10. J

    Radiators off, boiler switched off - can I turn the water on?

    The radiators were taken off and the boiler was switched off as was the water supply. Would switching the water supply back on cause a leak? The only taps are the bathroom and kitchen which have their own stop valves. The toilet has not been removed.
    • Justice League
    • Thread
    • america boiler radiators switched usa water water on
    • Replies: 6
    • Forum: USA
  11. Z

    No switched live to boiler when hot water tank thermostat demands heat + CH staying on.

    Hi folks. I have a couple of issues, any help advice much appreciated. 1. When my hot water tank thermostat demands hot water (wired into Honeywell wiring centre), I do not get a switched live to the boiler. I get 69 volts ac for both on and off wires from the tank stat. I have fitted a new tank...
    • zipster
    • Thread
    • america boiler heat hot hot water live switched switched live tank thermostat usa water water tank
    • Replies: 4
    • Forum: USA
  12. A

    Switched live on Viessmann vitodens 100 boiler

    Hi all, I have installed Viessmann vitodense 100 combi boiler and about to connect to my wiring center, I could not find to which connector/port on the boiler should I wire switch live. Has anyone experience with this?
    • Artin
    • Thread
    • america boiler live switched switched live usa viessmann vitodens
    • Replies: 9
    • Forum: USA
  13. Dan

    GSR forum name switched back

    PMSL. Just realised I was trying to get rid of some monopoly on accreditation here by changing the name of a forum category. Not sure that'll work. :D :D :D Name changed back. We'll try and tackle the monopoly another way some other day lol
  14. M

    Loud bangs few mins after hot water/heating switched on

    Hi All, We have a greenstar 15ri boiler, what I believe is a vented cylinder and two tanks in the attic. About 10 minutes or so after the heating or hot water is switched on there are loud bangs/scraping noises coming from pipes next to the cylinder. We believe the culprit is an aerjec2 that...
  15. M

    Water leaks when mains switched on and off ?

    Is it likely there could be a leak in a join /copper pipe work that only really occurs when water is either flowing through or when it is initially filled/pressurised - as opposed to statically sitting in the pipe under mains pressure? The actual scenario is the mains was switched on and off...
  16. Z

    When CH is switched off the 3 port valve stays in the man position therefore the CH stays on

    I have a Camray 5 90 external combi oil fired boiler. I replaced the 3 port valve body only as it was leaking and after that seemed to work ok. However shortly after when CH was being called for the accuator wasnt moving and had to manually be moved to man position to get CH. However the other...
  17. A

    Baxi Duo-Tec 24GA - Fan only on, no display when switched on at mains

    Having issues with the boiler making a arcket when hot water/heating running, sounds like combustion needs resetting as it runs perfectly for 10 minutes then error E comes up and flame symbol. Boiler restarts and runs perfectly again until next time which could be never or 30 minutes Service...
  18. P

    Monobloc Tap drips after being switched off

    Hi there,I bought a new tap from Screwfix. It is a Watersmith Heritage cubic single lever monoboc mixer kitchen tap. The problem is that when it is switched off it runs a small amount of water for about 10 seconds, then drips for about 10 seconds and goes completely off. I looked at the reviews...
  19. T

    Ideal classic ff240 no central heating hot water ok

    Hello folks looking for some help here my brothers house an open vented system . Ideal classic ff240does not fire up When heating is switched on. Boiler only fires up when hot water is switched on. Checked power to boiler also pump rums when heating switched on but still does not fire up. Anyone...
    • tartanarmyman
    • Thread
    • boiler central central heating system classic hot hot water ideal no central heating pumps switched water
    • Replies: 22
    • Forum: Plumbing Jobs | The Job-board
  20. Y

    Vaillant Ecotec Plus 624 question- only radiator sign comes up

    Dear All I recently had the above Vaillant stem boiler with megaflo system installed. I have 2 issues if someone could please kindly help: 1. When I check the control panel no hot water tap symbol appears. Only the radiator symbol even when hot water is switched on. Is this normal or do I...
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