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| OP amp design - RF Cafe Forums | ||||||
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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
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Below are all of the forum threads, including all the responses to the original posts. song123 Post subject: OP amp design Posted: Sun Sep 18, 2005 10:59 am Hi everyone, I am going to design a zero crossing detector with using an op amp. Then, I found a basic circuit from internet that the circuit uses voltage divider from the main source (230 V) as as input voltage (V+) for the op amp. One thing that I am not sure is, why it uses coupling capacitor instead of resistor in the voltage divider ? What is the advantage of it ? Ok. Thank you in advance. Top song123 Post subject: Posted: Sun Sep 18, 2005 11:10 am Sorry for the small image. Here I make it bigger. Thanks. Top Guest Post subject: OpAmp QuestionPosted: Mon Sep 19, 2005 11:53 am It's a matter of numbers. Resistors convert power=current*voltage into heat, capacitors don't. Why waste power? Good Luck! Top Guest Post subject: Re: OpAmp QuestionPosted: Mon Sep 26, 2005 11:25 am Guest wrote: It's a matter of numbers. Resistors convert power=current*voltage into heat, capacitors don't. Why waste power? Good Luck! Good Try.. The capacitor removes any DC offsets from the generator and the 500k provides the ground reference. Top Guest Post subject: Coupling capacitorPosted: Wed Sep 28, 2005 5:44 pm In most areas, the 230 V mains voltage comes from a transformer. Since transformers do not pass DC, there should be *NO* DC offsets on the incoming voltage. A resistor would, in fact, work in the circuit where the capacitor is shown. Good Luck! Posted 11/12/2012 | ||||||
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