Crystal Radio

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  • Last Post 05 September 2023
Shadow_ posted this 27 February 2023

Hello

I would like to introduce theoretically: a crystal radio - which does not require power

 

Gene's Machine

[...] Mollinet never lost that fascination, which heightened as he was flying P51s for the Air Force during the Korean War. He pulled apart a plane radio one day, and received a strange shock from one of the crystals used to latch onto radio frequencies. The crystal, e surmised in all innocence, was either storing energy or building its own. Coupled with a magnetic field, similar crystal substances will be used by Mollinet to keep the plane itself in the air, and without using any fuel. [...]

link: http://www.rexresearch.com/mollinet/mollinet.htm

 

 


crystal radio schema

 

Antenna (A). Empirical findings state that in order the pulsating signal from the antenna exceeds the required threshold value, the antenna must be at least 80 feet in length (i.e. not less than 24 meters). The earth wire (E).

 Coil (L). In original specifications this coil was defined as wound in a single layer on the surface or a non-conductive pipe. The pipe was around 5 cm in diameter (2 inches), and around 20 cm in length. It had 80 coils of conductor wound for the radio for middle range of AM wavelengths, or 150 coils for the radio that receives long AM wavelengths. (It could also be a single coil composed of two segments and a switch, so that than the radio could work on both ranges of AM wavelengths.)

 Tuneable capacitor (C) of the maximal capacitance around 365 pF.

Cluster of galena crystals (G) with "cat's whisker" for selecting the working connection point.

 Headphones (H) of an old type containing coils wound onto permanent magnets. These headphones must have impedance of at least 2000 Ohms. (Notice that present earphones typically have the impedance around one-third, or less, of this value.) 

 

“All we have to decide is what to do with the time that is given us.“

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Shadow_ posted this 27 February 2023

Hello

I would like to introduce theoretically: a crystal radio - which does not require power

 

Gene's Machine

[...] Mollinet never lost that fascination, which heightened as he was flying P51s for the Air Force during the Korean War. He pulled apart a plane radio one day, and received a strange shock from one of the crystals used to latch onto radio frequencies. The crystal, e surmised in all innocence, was either storing energy or building its own. Coupled with a magnetic field, similar crystal substances will be used by Mollinet to keep the plane itself in the air, and without using any fuel. [...]

link: http://www.rexresearch.com/mollinet/mollinet.htm

 

 


crystal radio schema

 

Antenna (A). Empirical findings state that in order the pulsating signal from the antenna exceeds the required threshold value, the antenna must be at least 80 feet in length (i.e. not less than 24 meters). The earth wire (E).

 Coil (L). In original specifications this coil was defined as wound in a single layer on the surface or a non-conductive pipe. The pipe was around 5 cm in diameter (2 inches), and around 20 cm in length. It had 80 coils of conductor wound for the radio for middle range of AM wavelengths, or 150 coils for the radio that receives long AM wavelengths. (It could also be a single coil composed of two segments and a switch, so that than the radio could work on both ranges of AM wavelengths.)

 Tuneable capacitor (C) of the maximal capacitance around 365 pF.

Cluster of galena crystals (G) with "cat's whisker" for selecting the working connection point.

 Headphones (H) of an old type containing coils wound onto permanent magnets. These headphones must have impedance of at least 2000 Ohms. (Notice that present earphones typically have the impedance around one-third, or less, of this value.) 

 

“All we have to decide is what to do with the time that is given us.“

Attached Files

Shadow_ posted this 27 August 2023

 

“All we have to decide is what to do with the time that is given us.“

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Shadow_ posted this 28 August 2023

 

“All we have to decide is what to do with the time that is given us.“

Inception posted this 28 August 2023

Passive Receiver

Decades ago ... many ... I constructed a simple crystal radio that was self powered. It was a well known experimenter's "first radio project" called a "passive receiver". All that was required was a crystal, coil, antenna, ground, and earphone.

Crystal Set

Crystal Radio

How does a crystal radio work.

The Alfred P Morgan Crystal Set

The next phase of that project used a Germanium 2n107 transistor, so you can imagine how long ago that was.

2N107

Crystal Set

Oddly enough, my set, like the one on the left, was made on a smaller piece of wood as my breadboard.

Enjoy.

Jagau posted this 05 September 2023

Hi Gandalf
The crystal radio as inception said is passive. To hear it you must amplify the electromagnetic wave received by the transmitting station, and increase the audio gain with an audio amplifier. It still works the same way today. whether AM or FM

Jagau

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