File:BSTJ mixer 1921.png
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Size of this preview: 800 × 478 pixels. Other resolutions: 320 × 191 pixels | 640 × 383 pixels | 1,024 × 612 pixels | 1,604 × 959 pixels.
Original file (1,604 × 959 pixels, file size: 41 KB, MIME type: image/png)
Summary
| Description |
English: Single balanced triode mixer from BSTJ 1921 |
| Date | |
| Source | E. H. Colpitts and O. B. Blackwell, "Carrier Current Telephony and Telegraphy," in Transactions of the American Institute of Electrical Engineers, vol. XL, pp. 205-300, January-December 1921, doi: 10.1109/T-AIEE.1921.5060708. |
| Author | E. H. Colpitts |
Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:34, 27 April 2026 | | 1,604 × 959 (41 KB) | wikimediacommons>WhaleFarm | Uploaded a work by E. H. Colpitts from Bell system technical journal February 1921 with UploadWizard |
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