Variable Frequency Oscillators (VFOs) - BJT & JFET + Buffer Amplifier Circuits

This video concludes my scratch builds as it relates to Variable Frequency Oscillators (VFOs) that were designed to cover the AM/BC Band that can be amplitude modulated if so desired. All builds have an Input Power less than 100 mW w/ one using a BC547C BJT, while the second design utilizes a NTE312 JFET. The VFO schematics are at the conclusion of the video in addition to a suggested Unity Gain Buffer Amplifier circuit that can be used as well to minimize frequency drift from loading, etc. Thanks for watching and subscribing to my channel on vintage radio repair. BOM 1 Semiconductors -------------------------- Q1 - BC547C Capacitors ----------------- C1 - 12 to 60 pF ceramic capacitor C2 - 33 pF C3 - 0.1 uF ceramic-disc C4 - 1.0 uF " C5 - 1.0 uF " C6 - 0.1 uF " C7 - 22 uF, 50V Electrolytic Resistors --------------- R1 - 10k, 1/4 W R2 - 1k, " R3 - 160 ohm, " R4 - 620 ohm, " R5 - 10k, " Other... ------------ L1 - Toroid FT50-43 (21 turns, tapped at 4 turns) 26 AWG enameled Magnet Wire 5cm * 7cm copper single-sided breadboard 9V battery & connector Wire, solder RED LED & 7k to 8k dropping resistor 3.5mm female audio socket jack SPST switch, enclosure, standoffs, etc. --------------------------------------------------------------------------------------------------------------------- BOM 2 Semiconductors -------------------------- Q1 - NTE312 N-Channel JFET D1 - 1N914 silicon diode Capacitors ----------------- C1 - 3 to 10 pF ceramic trimmer (adjust for best sinewave...