This circuit for the 60 kHz range was found in 73 magazine and published in 1995. The circuit uses a ferrite rod. Note the direction of the coil windings.
This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a...
What this interesting circuit does is to warn that a note written on a paper has been removed and...
This transmitter with counterphase oscillator was obtained in a documentation from the 90s. The...