This circuit is from 1999 documentation. However, it can still be easily assembled, as all components used are common. The sensors can have their quantity increased, being connected in parallel.
This circuit reverses the signal if both positive and negative. We found it in an American...
This VHF receiver with three transistors and loudspeaker listening was found in European...
Found in 1968 documentation this amplifier can be designed based on current transistors. Observe...