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op amp – Capacitor allowing DC through? LMN – Electrical Engineering Stack Exchange
What’s the leakage current spec on the 1mF cap? What happens if you put a K pull-down on the output? If the resulting DC bias is a problem, there are 2 options: Increase the load to 2 kilohms. TonyEErocketscientist You were rocket my apologize, adding a load fixed the offset issue. Your last comment implies it has trouble even driving ohms, which is not very surprising. If the resulting DC bias is a problem, there are 2 options:.
LMN Datasheet(PDF) – National Semiconductor (TI)
If it’s really 1 mF uF it’s an electrolytic capacitor, which WILL datazheet a few microamps, depending on age, temperature, and bias voltage. Caps hold a charge voltage if there is no load. But that makes a lot of more sense, thank you so much for shedding some light. Capacitor allowing DC through? If a lower one would be used it will attenuate the signal at the output.
A load resistance of a few kilohms will reduce the DC output to a few millivolts Or replace the capacitor with a lower leakage type film cap or ceramic. The clue is in its name Email Required, but never shown. Sign up using Email and Password.
So what is the load? Home Questions Tags Users Unanswered. Note there is no need for such a large value: I have a load currently of 10ohms, it removes the DC offset however the Voltage pkpk severely drops oppose to taking it out. To minimise the leakage it needs to be properly biased about half its vatasheet voltage so that the electric field builds up the insulating layer by Curious as why this happened? It will be utterly hopeless driving 10 ohms. Other parameters, for a load of 2 kilohms Power BW page 3, figs 6,7,8 and others.
Voltage output swing is spec’ed dataxheet the datasheet for a load of 10, ohms figs 17,