GB598963A - Improvements in and relating to electro-mechanical tuning forks - Google Patents

Improvements in and relating to electro-mechanical tuning forks

Info

Publication number
GB598963A
GB598963A GB688645A GB688645A GB598963A GB 598963 A GB598963 A GB 598963A GB 688645 A GB688645 A GB 688645A GB 688645 A GB688645 A GB 688645A GB 598963 A GB598963 A GB 598963A
Authority
GB
United Kingdom
Prior art keywords
fork
electro
tines
vary
flux density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB688645A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HARRY SHORLAND
Muirhead and Co Ltd
Original Assignee
HARRY SHORLAND
Muirhead and Co Ltd
Filing date
Publication date
Application filed by HARRY SHORLAND, Muirhead and Co Ltd filed Critical HARRY SHORLAND
Publication of GB598963A publication Critical patent/GB598963A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
    • H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter

Landscapes

  • Amplifiers (AREA)

Abstract

598,963. Tuning forks. MUIRHEAD & CO., Ltd., and SHORLAND, H. March 19, 1945, No. 6886. [Class 88 (ii)] In an electro-mechanical tuning fork of the valve maintained type, means are provided for varying the flux density in the magnetic circuit acting upon the tines of the fork in order to vary its frequency. The tuning fork 2 of magnetic material has two coils 3 with iron cores 4 polarized by magnets 5 associated with each of its tines. The permanent magnet 6 is rotated on shaft 7 or moved towards or away from the polarizing magnet 5, to vary the flux density in the air gap between the cores and the tine with which they are associated. A ganged rheostat is provided in the amplifier circuit feeding the driving coils to counteract the variation in output produced as the fork frequency changes and thus maintain the driving force substantially constant.
GB688645A 1945-03-19 Improvements in and relating to electro-mechanical tuning forks Expired GB598963A (en)

Publications (1)

Publication Number Publication Date
GB598963A true GB598963A (en) 1948-03-02

Family

ID=1628766

Family Applications (1)

Application Number Title Priority Date Filing Date
GB688645A Expired GB598963A (en) 1945-03-19 Improvements in and relating to electro-mechanical tuning forks

Country Status (1)

Country Link
GB (1) GB598963A (en)

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