This frequency division multiplexing signal decoding circuit is from a 1980s documentation. The integrated circuit used is not very common today.
This general-purpose transistor amplifier stage was found in the November 1993 issue of...
This conventional 4 channel circuit with the 4017 and 555 was found in the November 1991 Radio...
We find this circuit in an old technical documentation. The circuit can be drawn up with other...