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switched
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.
Hi,
I have a mystery leak with water dripping onto the stairs. This problem never occurs when I'm in the house but after returning from 2-3 nights at my girlfriends house there is always a constant drip to welcome me back, this has been going on for about 5 weeks now. As soon as I put the...
bradford1975
Thread
always
central
central heating
heating
leak
overflow
problem
switched
water
We have a Linea 24 combi boiler recently its been heating the house even though boiler switched to hot water only and the thermostat control switched to off (honeywell cm64 i think).
any ideas?
other issue we have is a radiator in the smallest bedroom getting only slightly warm when the...
Mike Davis
Thread
heating
hot
hot water
linea
other
radiator
radiators
switched
water
Hi All,
I hope someone can help with this as I am all out of ideas.
I have a customer who has been complaining of tap water which is too hot. He lives in a flat and has a Potterton system boiler, a cylinder and a motorised valve. I have replaced the tank stat and set the new one to 60 degrees...
This Unit as beed installed for about 2 mths and was working ok,, having had one of these unit before, we no how it works,,, anyway my wife comes home from work and the house was boiling hot she told me,but the RF Unit Control was swithed off, as am at work told her to just switch the boilder of...
andymanila
Thread
boiler
central heating system
control
faulty
salus
switched
working
Hi guys, hope some bright person on here can shed some light on the cause of this problem.
I did a gas safe check on a Ravenheat Primary AAA on Wednesday and had to replace the gas valve yesterday due to it passing on lockout. As usual, before working on an appliance I checked the basic...
Hi
Boiler is a potterton performa 24 combi
When the heating has been on for a while then turned off and switched to just the hot water symbol, the heating stays on,
even when the boiler thermostat is set to zero, the heating is very hot and is using a lot of gas.
The radiators are boiling hot...
davethomas
Thread
boiler
central heating system
hot
hot water
potterton
sounds
switch
switched
water
Hi guys, quick question about my boiler. We just had a problem with a tap for the last two days so the water has been turned off, the central heating was switched off downstairs but my wife had turned it on at the boiler without me knowing so i didn't think to check, so in essence the boiler was...
Si-83
Thread
airing
boiler
cupboard
help
help needed
needed
switched
water
Hi guys, i have just got home from a job. A couple of weeks ago, i installed a salamander pump. Had not put water through it yet though, as they had no shower.
So today, i install the shower, and turn on the pump, and nothing. Does not even attempt to make a noise. It has flow going through it...
Hello,
Not sure if I have to introduce myself on this forum or not so apologies.
I 'm trying to fit a Honeywell DT20 e thermostat to replace my old rotary Honeywell T40 one.
The DT 20e has two wires and is operated by batteries, as I understand it it requires a constant live and a...
Nindy
Thread
advice
combi
fitting
honeywell
main
neutral
switched
terminal
thermo
thermostat
Hi Guy's I'm hoping someone could help - I'm going crazy cos can't find the fault.
My father who's disabled had one of these crappy Isar He24 installed by warmfront in 2007, now since the guarantee has been up it's been one thing after another - changed PCB to the orange one; new spark...
Ball_Ship
Thread
again
ideal
isar
overheat
problems
switched
system
working
Hi
I have a Mira Excel Post 1996 mixer shower. It has been in our house for over 4 years.
Over the course of the four years, we have noticed that sometimes the shower pressure is sometimes lower than normal and sometimes the shower has been stiff to switch on.
Today, my OH had a shower today...
gjbalsdon
Thread
excel
fault
mira
shower
sometimes
switched
water
years
Hi,
A customers HWSC in an unvented system is making bubbling/running water noises when ever the hot water is switched on. Hot water and heating is working as normal but noise eminating from cylinder has only just started to occur within the last two weeks.:confused: Any ideas.
I will probably...
Mylesey
Thread
heating
noise
switched
system
unvented
water
welcome
Hi all, after some advice as to what this problem could be...
Boiler is a Valliant Ecotech combination boiler (approx 5-6 years old) located in the loft. Last weekend I drained the system out and turned the inlet on to flow some water through the rads, ran a cleaner through it and then...
jsr
Thread
boiler
central heating system
cold radiator
constantly
demand
diverter
hot rads
switched
turned
warm
The condenser pipe was recently re-glued in the loft. We were told to wait 12 hours before switching the boiler back on. We did this but the problem seems to be getting steadily worse. The reason for the fix in the first place was because the glue had melted initially when they installed it...
kdlang
Thread
bosch
condenser
leaking
outdoor
pipe
still
switched
worcester
worcester bosch
Since saturday, each time I have switched the boiler on it has failed to stay lit without the reset button being pressed. Tonight I had to press it about 10 times before the boiler staed ignited. Once started it seems to shut on and off normally (so far).
When switched on, the boiler does...
Mikeycollins
Thread
boiler
condensing
condensing boiler
could
ferrolli
needs
oil
someone
switched
Just wondered if anyone had experienced anything like this before I call Glow Worm on tuesday. Have just fitted new Ultracom 18 sxi system boiler to an existing system. System is Y plan and have also fitted new Honeywell 7 day programmer and roomstat - although this problem is not related to...
I have not used my CH system (neither CH or DHW) for a while now. The system is switched off at the Honeywell programmer. Have noticed that the Honeywell mid-position diverter is hot to the touch. The pipes entering/leaving the diverter are cold. Please can you help because I'm a little...
mswift
Thread
boiler
boilers
cold
dhw
diverter
diverter valve
hot
not firing
pipes
power
problem
reset
switched
system
valve
Hi All,
I have a Baxi 105e Combi Boiler that is approx. 4 years old.
All is ok, but recently I can only get hot water if the central heating is also switched on.
Strangely, initially it was just the downstairs water that was cold and upstairs was ok - but the last couple of days the...
Brian
Thread
baxi
boiler
central
central heating system
check valve
cleaning
cold
combi
combi boiler
diverter valve
hot
hot water
job
newbie
no hot water
price
problem
seal
switched
system
valve
valves
water
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