US3602626A - Electronic music keying circuit with diode and capacitor for reducing leakage current - Google Patents

Electronic music keying circuit with diode and capacitor for reducing leakage current Download PDF

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Publication number
US3602626A
US3602626A US860488A US3602626DA US3602626A US 3602626 A US3602626 A US 3602626A US 860488 A US860488 A US 860488A US 3602626D A US3602626D A US 3602626DA US 3602626 A US3602626 A US 3602626A
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US
United States
Prior art keywords
electrode
transistor
diode
output
circuit
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 - Lifetime
Application number
US860488A
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English (en)
Inventor
Kazuyuki Aramaki
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
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Publication of US3602626A publication Critical patent/US3602626A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/18—Selecting circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/07—Electric key switch structure

Definitions

  • the working resistance r resulting from the forward bias current of the diode D (or, in other words, resulting from the collector current of the transistor TR) will have a value which is considerably large when the key switch is in its "off" state, since the collector current of the transistor TR when the key switch is in its off state is much smaller than the current when said key switch is in its on” state.
  • the working resistance in this instance will take a value which is relatively large as compared with the reactance value of the junction capacitance of the diode against the higherharmonic components of the square wave input signal, and therefore, said working resistance r may be ignored.
  • the junction capacitance Cd of the diode is normally substantially equal to the inter-collector-base capacitance Ccb of the transistor.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US860488A 1968-09-27 1969-09-24 Electronic music keying circuit with diode and capacitor for reducing leakage current Expired - Lifetime US3602626A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968084108U JPS5312180Y1 (enrdf_load_stackoverflow) 1968-09-27 1968-09-27

Publications (1)

Publication Number Publication Date
US3602626A true US3602626A (en) 1971-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
US860488A Expired - Lifetime US3602626A (en) 1968-09-27 1969-09-24 Electronic music keying circuit with diode and capacitor for reducing leakage current

Country Status (2)

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US (1) US3602626A (enrdf_load_stackoverflow)
JP (1) JPS5312180Y1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784718A (en) * 1971-07-20 1974-01-08 Nippon Musical Instruments Mfg Touch-responsive keying circuit for electronic musical instruments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784718A (en) * 1971-07-20 1974-01-08 Nippon Musical Instruments Mfg Touch-responsive keying circuit for electronic musical instruments

Also Published As

Publication number Publication date
JPS5312180Y1 (enrdf_load_stackoverflow) 1978-04-03

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