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| View Original: | Two slider crystal radio circuit.svg (346x377) | |||
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| Keywords: Two slider crystal radio circuit.svg Circuit of a two-slider crystal radio receiver a popular circuit used in simple crystal radios made before 1920 To tune in different stations it used a tuning coil L1 with two sliding contacts on it It doesn't use a tuning capacitor instead the coil resonates with the capacitance of the long wire antenna to create a tuned circuit The left-hand slider tunes the receiver to different stations allowing more or less of the coil's turns in parallel with the antenna capacitance The right-hand slider adjusts the impedance match between the antenna and the rest of the circuit to maximise the power transferred from the antenna into the receiver It is adjusted until the station sounds loudest in the earphone E1 The coil acts as an impedance matching transformer to match the low impedance 10-200 ohms of the antenna-ground circuit with the higher impedance thousands of ohms of the coil at resonance The two adjustments were interactive so adjusting the right slider also detuned the radio requiring retuning own Chetvorno I User Chetvorno the author of this work release it into the public domain for any use whatever Crystal radios | ||||
