This biestable vox circuit was found in an old documentation. The circuit makes use of components of the time (80's) and can work as a shield since the power is 5 V.
This symmetrical configuration uses two operational amplifiers to obtain the rectification of a...
This circuit was obtained from a Hands On-Electronics, an American magazine from January 1987. This...
This mixer was found in Silicon Chip documentation from the 90's. The circuit uses integrated...