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ya you can if you place the switch in parallel with led. as long as you press switch the current will follow low impedence path means through resistor and switch not to led.
hi hamadsultan,
you do not understand what i am saying. turbine type flow meter has almost sin wave. if u use a non-inverting op-rectifier (half wave), you will get pulses equal to frequency (as 50 hz ac produce 50 +ve pulse after rectify by half wave rectifier).then amplify these pulses by...
hi friends
1. the o/p of turbine is ac, hence first convert in to dc.
2. the voltage less than .7 can not rectify with diode , so you need to use op-amp as precise rectifier. you can get the circuit on books or internet.
3. after rectify your low level signal , amplify it by op-amp amplifier by...
hi friends
I think you should implement x-or gate. when you provide supply led will glow but as you press the switch the led will off becos X-or gate has 0 o/p when both i/p are same (either 1,1 or 0,0).
the led will glow only when only one of two has high logic, thus you can perform both...
hi friends
1.using triac as switch than a relay will a better option.
2. it does not need zero cross detector , bcos it need only when you are controlling the phase.
3.snubber circuit is necessary when using a inductive load is using with a triac.
4.use a optoisolator moc3021 to couple the triac...
at the place of transmitter u can also use mobile phone to generate the dtmf signal. or
use two mobile phone. first is connected to receiver circuit and make automatic answer enable. when you call by second mobile phone to first , the call will received automatically. then press any key (0-9)...
ANS 1-
The use of single resistor and potential divider bias depend on your application.
fixed biasing is done with single resistor but having stability very low(s=1+\beta ).
and higher the value of S ,lower the stability.
but stability of divider ckt is too high,bcos S has lower value...
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