We found this circuit in a documentation from the 90's. The coil has its characteristics given next to the diagram. Power is provided by a 9 V battery and a range of a few tens of meters.
Twin-T oscillators can be used to produce sinusoidal signals in the audio track with good...
November 2016 - Texas Instruments' new TPS62135 and TPS621351 step-down converters with a wide...
This circuit is from the factory manual of the LM202, an uncommon operation today. It shows how to...