This circuit can be used to test crystals from 1 to 20 MHz and also has an output to measure their frequency. We found it in the November 1998 Electronics Now magazine.
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...