082E)
We started with a simple Hartley oscillator circuit using a bipolar transistor that can generate signals in the range from 1 MHz to 10 MHz with great stability. The circuit shown in the figure has L1 and CV designed to determine the operating frequency range. For an operation between 1 MHz and 3 MHz, L1 can be formed by 50 + 15 turns of wire 28 in a 0.8 cm diameter and 12 cm long ferrite rod. For greater stability the source must be stabilized, the ceramic capacitors and the transistor can be replaced by equivalents. In a more critical application, the output coupling capacitor must be of silver mica.
