This circuit was found in Radio Electronics magazine from June 1958. The maximum distance depends on cable losses. More stations can be added.
Found in old documentation for radio amateurs, this circuit is intended to excite a MOSFET on the...
This silencer or squelch preamp circuit was found in a documentation for radio amateurs. It...
This Siliconix circuit was found in a 1980s documentation. The coil consists of 18 turns of 22...