Found in a 90s R-E Experimenter Handbook, this circuit has a greater gain than the previous one for presenting two stages. The integrated circuit used is uncommon today.
Using the 709 integrated circuit, one of the first operational, this circuit was found in the...
This signaler, depending on the transistor, can have a range of a few hundred meters. The 600 Hz...
This circuit, which appears in direct applications on the website or as part of other articles, uses a...