This circuit produces a low frequency magnetic field used in old inductive remote controls with a range of a few meters. The circuit can be mounted with BD136 transistors for Q1 and 2N3055 or TIP31 for Q2. The coil consists of about 200 turns of enamelled wire 26 or 28 on a ferrite rod and the power is made by medium cells. The circuit is from a 1970s publication.
