This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
This circuit is from a 1977 publication for radio amateurs presenting a crowbar protection. The...
E) We found this circuit in a PE Hobbyst Handbook from the 90s. The components are common, except...
This circuit is from a Radio Electronics magazine from February 1962. It makes use of an old...