This circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit operates in the FM range. The coil has 4 turns of 24 or 26 wire in a coreless form 0.5 cm diameter.
This receiver receives signals in the 17 MHz or 11-meter range and can be used as a base for an...
The operational amplifier used in this circuit is not common today. The frequency is given by the...
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...