CN101692717A - Down-frequency power supply circuit for directly-heated type electron tube filament - Google Patents
Down-frequency power supply circuit for directly-heated type electron tube filament Download PDFInfo
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- CN101692717A CN101692717A CN200910036351A CN200910036351A CN101692717A CN 101692717 A CN101692717 A CN 101692717A CN 200910036351 A CN200910036351 A CN 200910036351A CN 200910036351 A CN200910036351 A CN 200910036351A CN 101692717 A CN101692717 A CN 101692717A
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Abstract
The invention relates to a power supply circuit for directly-heated type electron tube filament, and comprises an output end of an oscillatory circuit lower than 20Hz, the output end of the oscillatory circuit is connected with an input end of an amplifying-driving circuit, and the output of the amplifying-driving circuit drives the directly-heated type electron tube filament; the oscillatory circuit and the amplifying-driving circuit are respectively connected with the power supply circuit, the power supply circuit transforms AC220V of an AC grid into a DC power source. The invention has the advantage that an oscillator with the frequency lower than 20Hz is combined with the amplifying-driving circuit to provide power for the directly-heated type electron tube filament, thus obtaining good tone quality while ensuring low noise.
Description
Technical field
The present invention relates to a kind of power supply circuits, especially a kind of down-frequency power supply circuit that is used for directly-heated type electron tube filament.
Background technology
The stereo set (as power amplifier) that electron tube (directly-heated tube especially wherein) is made is compared with the transistor goods has touching, the of a specified duration characteristics of not minding of listening of tonequality cordiality, is subjected to being particular about tonequality personage's high praise.Because the filament of directly-heated tube is exactly a negative electrode, the part of audio signal path just is so the situation of filament power supply can influence noise and tonequality.
The supply power mode of directly-heated type electron tube filament has two kinds usually: exchange and the direct current mode.Alternating Current Power Supply as shown in Figure 2, directly utilize the filament of the secondary supply electron tube of transformer TR2, advantage is that circuit is simple, and is gentle in voice fresh and alive, in any case shortcoming is noise suppressed potentiometer (balanced potentiometer) VR1 that adjusts among Fig. 1, and residual grunt (50HZ hum) is always arranged in the loudspeaker.According to the difference of audio amplifier sensitivity, the distance that can hear grunt is between 20-100cm.The direct current supply mode as shown in Figure 3, supplies electrons spot silk after transformer TR3 step-down, rectifier bridge BR1 rectification, capacitor C 3 filtering; It is desired value that resistance R 3 is used to adjust voltage; Advantage is that the noise of equipment can accomplish very low, and shortcoming is that compare tonequality with Alternating Current Power Supply stiff inflexible, and also there is adverse effect in life-span of electron tube.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of down-frequency power supply circuit that is used for directly-heated type electron tube filament is provided, both can avoid the interference of AC hum, can make soft anti-tin of tonequality again, life-span of electron tube is also had no adverse effects.
According to technical scheme provided by the invention, the described power supply circuits that are used for directly-heated type electron tube filament, comprise that an output that is lower than the oscillating circuit of 20HZ is connected with the input of an amplifying-driving circuit, the output of described amplifying-driving circuit drives directly-heated type electron tube filament; Oscillating circuit is connected with power circuit respectively with amplifying-driving circuit, and described power circuit is transformed into DC power supply to the AC220V of AC network.
Advantage of the present invention is: with a frequency is that oscillator below the 20HZ adds that amplifying-driving circuit provides the filament power supply of directly-heated tube, thereby can guarantee the low noise good tonequality that obtains simultaneously;
1. do not have AC hum, ear is attached on the loudspeaker can't hear yet;
2. tonequality is significantly better than the amplifier of direct current filament power supply;
3. the degree of purity of sound is better than traditional interchange filament supply power mode.
Description of drawings
Fig. 1 is typical single-ended directly-heated tube power amplifier circuit figure.
Fig. 2 is AC Lamp filament power supply circuit figure.
Fig. 3 is a direct current filament power supply circuit.
Fig. 4 is a frequency reducing power supply schematic diagram.
Fig. 5 is frequency reducing AC Lamp filament power supply circuit figure.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The audiorange that people's ear can be heard is 20HZ-20KHZ, powers to filament with the sine ac power supply beyond this frequency range, both can avoid the interference of AC hum, can make soft anti-tin of tonequality again, and life-span of electron tube is also had no adverse effects.Actual tests shows that effect was not as being lower than 20HZ when frequency of supply was higher than 20KHZ.
As shown in Figure 4, oscillating circuit of the present invention adopts sine-wave oscillator OSC, its output connects amplifying-driving circuit AMP-DRV, sine-wave oscillator OSC is used to produce one and listens the outer sine wave signal of voice frequency, AMP-DRV then is amplified to suitable amplitude to this signal and drives the electron tube heater of low-resistance, and power circuit POWER provides required DC power supply to sine-wave oscillator OSC and amplifying-driving circuit AMP-DRV.
As shown in Figure 5, described sine-wave oscillator OSC (Wien-bridge oscillator) comprising: amplifier N1B, the 4th resistance～the 7th resistance R 4-R7, potentiometer VR2, the 4th capacitor C 4, the 5th capacitor C 5, the first diode D1, the second diode D2, timeconstant=R4C4, effect was better when frequency of oscillation was 16-18HZ.
Described amplifying-driving circuit AMP-DRV is the anti-phase amplification of typical amplifier-transistor emitter follower circuit, comprising: amplifier N1A, the 8th resistance～the 14 resistance R 8-R14, the 3rd diode～the 6th diode D3-D6, the first Darlington transistor T1, the second Darlington transistor T2.The output OUT of amplifying-driving circuit AMP-DRV and reference edge REF meet two end f1, the f2 of directly-heated type electron tube filament respectively, and the output of amplifying-driving circuit AMP-DRV drives the filament of electron tube.
The present invention compares this circuit near technology following characteristics is arranged with existing:
1. do not have AC hum, ear is attached on the loudspeaker can't hear yet.
2. tonequality is significantly better than the amplifier of direct current filament power supply. 800 yuan of domestic dawn board 300B electron tube prices/right for example, the electric board electron tube 300B in U.S. west is 8000-20000 unit/to (production year is for the different price differences of version, about tonequality slightly has), in the situation of same employing direct current filament power supply, the tonequality of the electric board electron tube in west significantly is better than the dawn board, has overwhelming advantage. The same amplifying circuit that adopts as shown in Figure 1, if dawn board electron tube use instead the present invention as shown in Figure 5 power supply mode and western electric board electron tube is still used the direct current mode, tonequality is just equally matched, in other words mutual length. As again dawn board electron tube being used instead 1200 yuan/right domestic osmanthus light board 300B electron tube, tonequality has just surpassed western electric board electron tube 300B comprehensively.
3. owing to reduced the interference of AC network high frequency parasitic noise, the degree of purity of sound is better than traditional interchange filament power supply mode.
4. when adopting filament power supply circuits of the present invention, can replace the potentiometer VR1 among Fig. 1 with the fixed resistance of two pairings, also not have AC hum, make things convenient for production when improving tonequality and reliability. (because the electric current that flows through potentiometer VR1 is bigger, the reliability of VR1 being reduced) simultaneously the tonequality of resistance obviously is better than potentiometer.
5. cost is compared very worth a little more than two kinds of traditional filament power supply modes with the effect that obtains.
Claims (1)
1. power supply circuits that are used for directly-heated type electron tube filament is characterized in that: comprise that an output that is lower than the oscillating circuit of 20HZ is connected with the input of an amplifying-driving circuit, the output driving directly-heated type electron tube filament of described amplifying-driving circuit; Oscillating circuit is connected with power circuit respectively with amplifying-driving circuit, and described power circuit is transformed into DC power supply to the AC220V of AC network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910036351A CN101692717A (en) | 2009-09-21 | 2009-09-21 | Down-frequency power supply circuit for directly-heated type electron tube filament |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910036351A CN101692717A (en) | 2009-09-21 | 2009-09-21 | Down-frequency power supply circuit for directly-heated type electron tube filament |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101692717A true CN101692717A (en) | 2010-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910036351A Pending CN101692717A (en) | 2009-09-21 | 2009-09-21 | Down-frequency power supply circuit for directly-heated type electron tube filament |
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| CN (1) | CN101692717A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896893A (en) * | 2017-02-21 | 2017-06-27 | 林敦 | Directly-heated tube multistage amplifier circuits |
| CN109889167A (en) * | 2019-03-01 | 2019-06-14 | 陈东平 | A kind of direct-heating-type electron tube exchange lighting bottom is made an uproar control technology and device |
-
2009
- 2009-09-21 CN CN200910036351A patent/CN101692717A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896893A (en) * | 2017-02-21 | 2017-06-27 | 林敦 | Directly-heated tube multistage amplifier circuits |
| CN106896893B (en) * | 2017-02-21 | 2020-09-22 | 林敦 | Multistage amplifier circuit of directly-heated electron tube |
| CN109889167A (en) * | 2019-03-01 | 2019-06-14 | 陈东平 | A kind of direct-heating-type electron tube exchange lighting bottom is made an uproar control technology and device |
| CN109889167B (en) * | 2019-03-01 | 2023-09-12 | 陈东平 | Direct-heating type electronic tube alternating-current lighting bottom noise control method and device |
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20100407 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |