Found in Philips' 90s documentation, this small source can use modern transistors like the BD135 for TR4 and the BC series for the rest.
This circuit makes use of comparators and common operational amplifiers, having been found in...
Standing wave ratio or SWR is an important measure of whether all power from a transmitter is being...
A configuration using three of the four voltage comparators on the LM339 is shown in the figure and...