A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power.

For a crystal radio, you need a good quality germanium diode, which will provide a nice strong signal. The best diodes that provide the strongest and clearest signal were vintage ones that had been recycled out of old radios.

The diode resistance RD of germanium diodes is most times rather low, and only useable in crystal receivers with a low Q (low sensitivity and low selectivity). For high performance receivers, we can better use a suitable schottky diode.

2024年7月20日 · There are numerous excellent websites such as this one by Dick Kleijer or SV3ORA's site ... all describing elaborate ways to determine which diode is ‘the best one’ (the holy grail diode!) for crystal radio work.

2021年6月28日 · Crystal radios use only an antenna to receive the radio signal and a diode to rectify/convert the radio signal to audio signal to be heard using a headphone. It is entirely passive and has no active components like transistors or ICs, and no battery or electricity is used.

The 1N34A Germanium Diode, a ceramic earphone and a tuning coil are all that is needed to make a simple crystal radio set. Because Crystal Radio Sets use only the power coming from the antenna, a good antenna is required to drive the earphone of a Crystal Radio Set.

1999年7月10日 · Design, construction and measurement of a single-tuned crystal radio set using a two-value inductor, along with a discussion of the cause of 'hash', short-wave ghost-signal and spurious FM reception.

Commercial diodes that can be used for crystal radios include the germanium diodes 1N34 and 1N277 (note: the 1N277 has in most cases replaced the old 1N34), silicon diodes such as the 1N914 and 1N4148, and a variety of microwave diodes with the

1999年7月15日 · This Article describes ways to optimize the interaction between antenna, tuned circuit, detector diode and headphones for the best possible sensitivity, selectivity, volume and the least audio distortion in a crystal radio

The diode types include germanium, silicon, Schottky, and even a light-emitting diode! The test setup uses an accurate RF synthesizer, a homemade AM pin diode modulator driven by an audio generator, a simple test fixture, a DC power supply for adding bias current, and a …