aredhel said:I only know of the Wein Bridge and the Twin-T ... been looking for other notch topologies. Could you recommend some?
LvW said:Highpass: Do you need a highpass of 2nd order ? If not, there is a 1st order topology which is best suited for low frequencies: A simple RL-highpass scheme with active simulation of the inductor using two opamps (gyrator principle using the impedance converter structure).
Notch: The best circuit - as far as dimensioning is concerned - is a structure based again on the impedance converter principle. However, two opamps are required. Two other one-opamp topologies are based on the multifeedback-bandpass filter. If necessary I could send you a schematic.
Any opamp will work with a single supply voltage if its inputs are biased properly at half the supply voltage.aredhel said:Is there a way for me to supply the voltage with only one battery to the circuit?
Audioguru said:Any opamp will work with a single supply voltage if its inputs are biased properly at half the supply voltage.
With a dual polarity supply the inputs are biased at ground which is half the total supply voltage.
The lousy old 741 opamp needs a minimum supply voltage of about 12V. A few will work if the supply voltage is 9V.
Many modern opamps work if the supply voltage is from 3V to 36V.
But I can't attach my schematic because it was posted here somewhere before.
I changed its title and here it is:
I give up. I can't post it again and I can't find it here.
Every other electronics chat forum doesn't block posting the same schematic in different posts.
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