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发表于 2013-12-16 20:49 | 显示全部楼层
本帖最后由 海胆 于 2013-12-16 21:46 编辑

哪位高手分析一下电路的结构和特点。
hd220-tt1.JPG
hd220-tt2.JPG
hd220-tt3.JPG
tt1.JPG
tt2.JPG
tt3.JPG
tt4.JPG
hd220-1.JPG
hd220-2.JPG
hd220-3.JPG


补充内容 (2013-12-27 19:23):
了解了一下:David Hafler联合Edlaurent  1955年创立了著名品牌Dynaco品牌,并在晚年自创Hafler 品牌。
和pass 没有关系,记错了!

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 楼主| 发表于 2013-12-16 20:50 | 显示全部楼层
本帖最后由 海胆 于 2013-12-16 21:04 编辑

dy2.JPG 继续

SPECIFICATIONS
Power Rating: Less than 0.02% total harmonic distortion at
any power level up to 115 watts continuous average power
per channel into 8 ohms at any frequency between 20 Hz
and 20 kHz with both channels driven.
Input Impedance: 47,OOO ohms.
Input Sensitivity: 1.55 volts rms for 1 15 watts into 8 ohms.
IM Distortion (SMPTE): Less than O.OOS’%, from 1 watt to 1 15 Damping Factor: 300 to 1 kHz into 8 ohms
watts into 8 ohms. 60 to 10 kHz into 8 ohms
Typical THD at 115 watts into 8 ohms:
I kHz - 0 002%5
IO kHz - 0.007%
20 kHz - 0.012’/‘
Frequency Response into 8 ohms:
- 3 dB. 2 Hz to 160 kHz at 1 watt
+O, -0.5 dB, 6 Hz to 60 kHz at 1 15 watts
Rise Time: 10 kHz. 60 volts peak to peak square wave, 1 0%
to 9 0 % 2.5 us.
Slew Rate: 10 kHz. 60 volts peak to peak square wave: 30 VI’,~ s.
Semiconductor Complement: 26 transistors. 8 power
Mosfets, 29 diodes, 4 zener diodes. 1 diode bridge.
Typical Channel Separation: 20 Hz:> 75 dB
1 kHz:>85 dB
20 kHz: >6S dB
Power Consumption: 1 15 watts into 8 ohms: 840 VA;
Quiescent: 125 VA.
Size: 5-1/8” high. 16” wide, 10-l/2” deep.
Signal to Noise Ratio, unweighted: Better than 100 dB at 115
watts into 8 ohms. Net Weight: 26 Ibs. Shipping Weight: 30 Ibs.
All Specifications are subject to change without notice.


dy.JPG

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 楼主| 发表于 2013-12-16 20:55 | 显示全部楼层
本帖最后由 海胆 于 2013-12-16 21:32 编辑

关于David Hafler 的一点介绍.
其1984年入选音频名人堂

David Hafler 1919?2003
June 1, 2003 ― All of us at Stereophile were saddened to learn of the death of audio pioneer David Hafler, who died Sunday, May 25 of complications of Parkinson's disease at St. Agnes Hospice in Philadelphia. Hafler was 84.
Hafler had an enormous influence on several generations of audiophiles and music lovers. A graduate in mathematics from the University of Pennsylvania, Hafler served as a communications specialist in the Coast Guard during the Second World War. In 1950, he founded Acrosound, a transformer manufacturer. In 1954, he founded Dynaco, a name that became synonymous with good sound and good value. Hafler's entire career was built on the concept of providing great performance at an affordable price.

His first company's "Dynakits"―preamps and power amplifiers in kit form―were assembled by hundreds of thousands of enthusiasts in the 1950s and '60s, a period when audio was primarily an engineering hobby and most good-sounding gear was built by its owners. Several Dynaco products from the period are still regarded as among the best ever made, including the ST-70, a 35Wpc stereo tube amplifier with a highly efficient push-pull output circuit. The ST-70 was the prototype for most similar designs that followed from other companies. The Dynaco Mk.II, a 50W amplifier, was featured in a media display in the Smithsonian's Museum of American History in Washington in the 1990s. (A detailed history of Dynaco can be seen here.) Hafler sold Dynaco to Tyco in 1968, but stayed on in an advisory capacity until 1971.

In 1972, he founded the David Hafler Co., continuing the tradition of inexpensive kits, but also offering pre-assembled products. The company produced many near-legendary preamps, among them the DH-101 and DH-110, and a line of MOSFET power amps, including the DH-200, DH-220, DH-500, and XL-280.

The DH-500 and XL-280 were among the earliest high-power amps available at accessible prices. Relatively easy to assemble and elegantly designed, Hafler products spawned a secondary industry in audiophile modifications, including the well-regarded work by Musical Concepts. Always pushing the boundaries of audio reproduction, Hafler did some of the earliest experiments in surround sound and ambience retrieval, including popularizing an ingenious method that extracts the difference signal from a stereo pair by wiring a third speaker across the hot leads.

Hafler sold his namesake company in 1987 to the Rockford Corporation of Tempe, Arizona, where it is still based. The Hafler Company makes audio products primarily for the professional market, where the brand is valued for its excellent sound and reliability.

Hafler's name is permanently etched into the history of audio―along with those of Saul Marantz, Avery Fisher, and a handful of other pioneers who built the industry in the mid-20th century. David Hafler was inducted into the Audio Hall of Fame in 1984.

Hafler was buried Tuesday, May 27, at Mount Sharon Cemetery in Springfield, Delaware County, PA. His wife, Gertrude Schwinger, to whom he was married for more than 60 years, died in 2001. Hafler is survived by daughters Joan Cole and Diane Marinoff, son Eric, and by five grandchildren and two great-grandsons.

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发表于 2013-12-16 22:01 | 显示全部楼层
口水啊.

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发表于 2013-12-16 22:08 | 显示全部楼层
典型的全对称双差分电路,特别之处是在电压放大级前加了一级射随器,降低电压级的失真。
头像被屏蔽

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 楼主| 发表于 2013-12-16 22:18 | 显示全部楼层
提示: 该帖被管理员或版主屏蔽

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 楼主| 发表于 2013-12-16 22:22 | 显示全部楼层
请教一下,电路图中的“A、B、C、D、E”的测量值分别多少?

电源+-65V供电。

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发表于 2013-12-16 22:22 | 显示全部楼层
为什么称为PASS的前身?

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发表于 2013-12-16 22:44 | 显示全部楼层
资料不错,收藏了!谢谢分享!

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 楼主| 发表于 2013-12-17 12:22 | 显示全部楼层
David Hafle前半身 搞hafler,后面搞 pass

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 楼主| 发表于 2013-12-23 09:38 | 显示全部楼层
hd220-三极管位置图.JPG

零件表中有误,特上实测三极管位置图。

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 楼主| 发表于 2013-12-23 09:58 | 显示全部楼层
dh-220详1.JPG
dh-220详2.JPG
dh-220详5.JPG
dh-220详4.JPG

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 楼主| 发表于 2013-12-23 10:00 | 显示全部楼层
这个NP  2n540 三极管怎么买不到?


dh-220详3.JPG

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 楼主| 发表于 2013-12-23 10:28 | 显示全部楼层

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发表于 2013-12-23 10:50 | 显示全部楼层
再现全对称。散热器有特点。

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发表于 2013-12-23 10:59 | 显示全部楼层
海胆 发表于 2013-12-23 10:00
这个NP  2n540 三极管怎么买不到?

奇怪2N540的PDF显示是PNP锗管,不是塑封管

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 楼主| 发表于 2013-12-24 08:59 | 显示全部楼层
本帖最后由 海胆 于 2013-12-24 09:01 编辑
天马飞云 发表于 2013-12-23 10:59
奇怪2N540的PDF显示是PNP锗管,不是塑封管


花了1小时多,将零件对了一遍。
估计是 2n5401,管子印刷时偏了一点,Q5和Q6是全对称结构,应该都是5401。

hd220-tt5-零件电路图.JPG

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发表于 2013-12-24 09:04 | 显示全部楼层
海胆 发表于 2013-12-24 08:59
花了1小时多,将零件对了一遍。
估计是 2n5401,管子印刷时偏了一点,是全对称结构。

这就对了,这个电路在电压放大级前加了一级射极跟随器这个设计不错。

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 楼主| 发表于 2013-12-24 09:04 | 显示全部楼层
请教一下电位器 P1  “offset”  是输出调零吗?
               p2              是调整功率管电流?没有0.1欧的电阻监测电压,最好如何 调整电流?

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发表于 2013-12-24 09:22 | 显示全部楼层
海胆 发表于 2013-12-24 09:04
请教一下电位器 P1  “offset”  是输出调零吗?
               p2              是调整功率管电流?没有 ...

P1调零电位器是调整输出端零电位,P2输出管静态电流调整用,可以在输出管S极串联0.1欧电阻测量电压调整,调整完毕短接即可。
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