Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain today. It achieves a 10 dB noise reduction with the indicated components.
This circuit has a frequency range of 30 Hz to 100 kHz with an output signal of 1 Vrms. We found...
In the figure we have a second order filter with very high input impedance, using an operational...
Using the HA2400 this circuit can generate signals of a few megahertz depending on R and C. The...