A Crystal Radio Diode Detector Simulation using SPICE

A crystal radio set detector may be simulated in Spice by using a voltage source V1 feeding a parallel tuned circuit L1|C1 through a source resistance R1. The parallel tuned circuit may be made to have any Q by placing a parallel resistor across the tuned circuit. In the simulation circuit files enclosed, an infinite…

Diode Voltage/Current Curves: Does a Specific “Knee” Voltage really Exist?

I think that there is validity to the notion of the existence of a diode “knee” when clamping circuits are considered, and maybe with other circuits. I do not think that there is any validity to the notion of a “knee Voltage” in the forward conduction portion of a diode curve when low signal level…

Build the Crystal Set Diode Detector Bias Box

Build the Crystal Set Diode Detector Bias Box: a simple and easy way to determine if one’s diode is optimum for weak signal reception, or it should have a higher or lower axis-crossing resistance (0.026*n/Is ohms) Quick Summary The ‘Diode Detector Bias Box’ enables one to check whether the diode being used in a crystal…

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