This circuit was found in old documentation, but the setting applies to any operational. Resistors and capacitors determine the frequency. For the indicated values the frequency is 10 kHz.
The cut-off frequency of the filter shown in the figure can be adjusted to values between...
This circuit was found in a Popular Electronics from the 90s. The components used are all common...
This circuit uses a dual floodgate MOSFET not very easy to obtain today. Its handling is very...