We found this mixer in an American documentation. Operational amplifier supports equivalent and changed number of inputs. Power can be between 6 and 12 V.
We found this circuit in a publication from the 70s, with some configurations that we think are...
This ground-based circuit was found in 1990s American documentation. The transistor can be any...
This circuit was found in the December 1983 issue of Radio Electronics magazine. The sensor is an...