In fact, i'll work out the way I have one circuit built here because it seems it's similar, but replaces a vari cap with an inductor. The second is a '104' ceramic
Range is vastly improved if the free end of the Hartley coil connects to a bigger coil. But, I was after making it as small as possible.
Here's that one on 3V, called 'Sprog' because it's a baby of a size. Coin is a USA 1 cent.


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