We found this circuit in the July 1994 Radio Electronics magazine. The circuit uses a general-purpose transistor, and the power supply can be up to 12 V depending on the relay.
This circuit is from a 70s documentation. The maximum sampling rate is 800 Hz. The operational...
This standing wave alarm (SWR) warns when a high SWR value may mean an overload for the...
This circuit has a very high input impedance and a very low output impedance. We found it on a...