This circuit was found in an Electronic Design. The circuit can be programmed to operate in different frequency ranges with the indicated characteristics. The IC component is uncommon today.
We found this circuit in a Popular Electronics of the 90s. The MOSFET can be of any type,...
In fact, the correct name would be a hearing aid amplifier. However, we use the name of the...
This circuit controls a relay causing it to open and close its contacts at a speed that depends on the...