This filter, with a cut-off frequency of approximately 1 kHz, has a high Q and employs two operational ones. The power supply must be symmetrical.
Using an era germanium transistor, this 1960s circuit reverses the phase of relatively low...
Featuring an 8 MHz passband, Texas Instruments TVS912A operational amplifiers can be found at...
We found this circuit in a technical documentation from the 70s. It can be implemented with more...