A really basic JFET Hartley oscillator.
Probably a lesson on how NOT to build a VFO! The device fires up and makes RF, but it is extremely vibration sensitive, as demonstrated. I used a J310 jfet instead of the device called out in the schematic. http://w6iee.blogspot.com
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The Hartley and Colpitts Oscillators with Demo (AD# 103)
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Variable Frequency Oscillators (VFOs) - BJT & JFET + Buffer Amplifier Circuits
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Hartley Oscillator - Sine Wave Generator - Mated With a Common Base Amplifier - Simply Put
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Crystal Oscillator at Overtone
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EEVblog 1752 - Texas Instruments SCREWED UP the NE5532!
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Hartley Oscillator with Programmable Frequency (9 - Oscillators)
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#1372 Wien Bridge Oscillator THD
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Analog oscilloscope repair - tons of problems!
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VHF 2 Meter 829B Push Pull Class-C Vacuum Tube Amplifier
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Pierce Crystal Oscillator Circuit Using a JFET
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#123: Build a crystal oscillator from schematic thru prototype construction and testing - DIY
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Hartley Oscillator Circuit
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Practical Colpitts Oscillator
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We power up a giant Thyratron tube
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I Found Hidden Wires… Then the CTO Emailed Me.
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Radio Design 101 - RF Oscillators (Episode 4)
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Analog 1 FET BF 256A sine wave radio oscillator 116 KC - 2 MC definite schematic & demo
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Testing quartz crystals with an HF receiver
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Frequency Response of JFET
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