This article is from a publication by A. Fanzeres from the 70s. We kept the original text. This small transmitter is sold in kits (see reader that is not here in Brazil) by AMTRON, throughout Europe. But while there is no kit of this nature here, let's give the tip to our readers. Ok? The only item to be built domestically is the coil: 12 turns, separated from one diameter, wire 18, enameled, internal diameter 10 mm. When it comes to coils, you always must experiment a little. One more turn, one less turn, and it will soon be working. For proof, use an FM receiver. The microphone and a small 3 1/2 inches speaker. The circuit offers no difficulties, and our readers will appreciate its performance. TR1 can be a BF494 and TR2 a BC548.
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