Hartley Oscillator Calculator
Enter the two inductor values and the capacitor to find the oscillation frequency.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A Hartley oscillator generates a steady sine wave by feeding part of an LC tank circuit’s output back into an amplifier, using a tapped inductor (split into two coils, L1 and L2) instead of the tapped capacitor found in its cousin, the Colpitts oscillator. Ignoring mutual inductance between the coils, the oscillation frequency follows the standard tank-circuit formula f = 1 / (2π√(L_total × C)), where L_total = L1 + L2.
Invented by Ralph Hartley in 1915, the circuit’s simple, robust design and wide tuning range made it a workhorse in early radio and continue to earn it a place in RF engineering today. Radio transmitter and receiver designers, ham-radio builders, and test-equipment makers use it to generate a stable carrier or local-oscillator signal from just two coils, a capacitor, and an active device.
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