This circuit was found in a Radio Electronics magazine from November 1992. The components are from that time and the power supply must be dual.
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...
This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz....
This project from a 1983 publication can be assembled using more modern transistors. We can use...