GB1219623A - An electrical switching circuit - Google Patents

An electrical switching circuit

Info

Publication number
GB1219623A
GB1219623A GB27290/68A GB2729068A GB1219623A GB 1219623 A GB1219623 A GB 1219623A GB 27290/68 A GB27290/68 A GB 27290/68A GB 2729068 A GB2729068 A GB 2729068A GB 1219623 A GB1219623 A GB 1219623A
Authority
GB
United Kingdom
Prior art keywords
diode
transistor
switch
output
signal
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
GB27290/68A
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.)
Hitachi Ltd
Original Assignee
Hitachi 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.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1219623A publication Critical patent/GB1219623A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/08112—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in bipolar transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors

Abstract

1,219,623. Transistor switching circuits; keying oscillators. HITACHI Ltd. 7 June, 1968 [19 June, 1967], No. 27290/68. Headings H3R and H3T. [Also in Division G5] In a switching circuit such as for an electronic musical instrument, a rectifying element such as a diode 32 is connected between a signal input 21 and the base of a transistor amplifier 22, a switch 23 is connected to the emitter of the transistor so that the amplifier 22 is conductive when the switch 23 is closed and time delay means 24 sustains the amplifier 22 conductive for a predetermined time after the switch is opened and exponentially attenuates the amplitude of the output signal and the rectifying element 32 is forward biased when the switch 23 is closed and reverse biased when the switch 23 is open. As shown, the diode 32 is reverse biased and transistor 22 is OFF so that the signal from tone generator 21 which may be pulse or sine wave is blocked from the output 33. When the key switch 23 of an organ is closed the bias at points 34, 35 changes to forward bias the diode and turn ON the transistor 22 so that an output occurs at 33. When the key 23 is opened, switching OFF and reverse biasing of the diode is delayed by the charging of capacitor 29 through resistor 28 so that the output is reduced over a time delay. A plurality of PN junctions could replace the diode 32. Alternatively the base emitter junction of a transistor could be used in place of diode 32. In a modified circuit (Fig. 3, not shown), the signal source is connected between the diode and collector load supply which is earthed together with the terminal corresponding to +V 4 , the switch and capacitor 29 being connected to a negative supply (- V 5 ). When the diode 32 is blocked it prevents the signal being transferred to the output 33 which would be the case via the base-collector capacitance (14), Fig. 1 (not shown) as is known even although the transistor is biased off.
GB27290/68A 1967-06-19 1968-06-07 An electrical switching circuit Expired GB1219623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3884967 1967-06-19

Publications (1)

Publication Number Publication Date
GB1219623A true GB1219623A (en) 1971-01-20

Family

ID=12536631

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27290/68A Expired GB1219623A (en) 1967-06-19 1968-06-07 An electrical switching circuit

Country Status (5)

Country Link
US (1) US3535972A (en)
DE (1) DE1772626C3 (en)
FR (1) FR1569291A (en)
GB (1) GB1219623A (en)
NL (1) NL6808487A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637915A (en) * 1969-04-14 1972-01-25 Nippon Musical Instruments Mfg Sustain keyer circuitry with sustain time control circuit in electronic musical instrument
US3652775A (en) * 1969-06-25 1972-03-28 Nippon Musical Instruments Mfg Percussion keyer for an electronic musical instrument
NL7015768A (en) * 1969-10-29 1971-05-04
US3655904A (en) * 1970-12-14 1972-04-11 Herbert Cohen Electric variable tone percussion instrument
CA970604A (en) * 1971-07-20 1975-07-08 Yasuji Uchiyama Touch-responsive keying circuit for electronic musical instruments
JP5758774B2 (en) 2011-10-28 2015-08-05 ローランド株式会社 Effect device
US8735710B2 (en) * 2012-02-10 2014-05-27 Roland Corporation Electronic stringed instrument having effect device
CN108322223B (en) * 2018-04-02 2024-02-09 延锋伟世通电子科技（上海）有限公司 State holding circuit with release function

Also Published As

Publication number Publication date
DE1772626C3 (en) 1973-11-15
DE1772626B2 (en) 1973-04-19
US3535972A (en) 1970-10-27
DE1772626A1 (en) 1970-08-20
FR1569291A (en) 1969-05-30
NL6808487A (en) 1968-12-20

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