Car Battery / 12V汽車電池 / 12V汽車電瓶
工作狀況電壓
* 未發動時正常電瓶電壓(未發動時間約3~10小時)，約12‧5v~12.7v如低於12.5v以下，電瓶儲電效能不好，容易流失電流。
* 發動後為發電機電壓，正常為14v~14.3v(需熱車10分鐘後測量) (檢測標準為汽車發動後，不開冷氣、不開音響、及大燈、不踩油門情況下。)
** 低於14v以下，發電機老化，發電量不足。
** 高於14‧3v 需注意發電機過充現象，超過15v以上，需立即更換發電機，以免損壞汽車電瓶及其他電器，因發電機內部的電壓調節器工作不正常而造成充電電壓過高，電瓶內溫度昇高，易造成電瓶水蒸發過快。
* 如電壓過低(低於13‧5v 發電機內部六個整流二極體，其中有損壞，造成電壓太低。
發動後熱車10分鐘內，電壓上升幅度大，常高於14‧5v屬正常現象。熱車10分鐘後， 溫度達一定電壓才穩定下來。
link
* 鉛酸電池擁有極高放電流, 如誤將電極短路會產生高熱並可能引發爆炸, 不可不慎。
* 電瓶充電時會產生大量氫氣, 請在通風良好的空間下充電, 充電前也要先補充足夠的電瓶水!!
* 車載電瓶直接充電如電壓過高可能引起電器故障, 甚至損傷行車電腦。
link 充電時電壓會到 16.06V !
2010-11-11
2010-11-01
木材材質-南洋檜木是杉不是檜
2010-10-16
QUAD 67 CD
QUAD 66 TDA1541A CDM-9
QUAD 67 CS4328KP – SAA7310GP CDM-9/44
QUAD 77 CS4328 CDM 12.4
QUAD 99 CS4396
* The real last generation of Quad are: Quad 67 CD(CDM9-Pro transport, TDA1541A/S2 DAC with SAA7210, SAA7220 chipset. Now you know why it is so $ today.) link
* The Quad 67 was in production from mid 1993 to the end of 1996 and had sold 6,100 units.The Quad 66CD and by the end of its production run in 1996 almost 12000 units had been made.
* ＱＵＡＤ ６７ ＣＤプレイヤ－ 修理 link
QUAD 67 CS4328KP – SAA7310GP CDM-9/44
QUAD 77 CS4328 CDM 12.4
QUAD 99 CS4396
* The real last generation of Quad are: Quad 67 CD(CDM9-Pro transport, TDA1541A/S2 DAC with SAA7210, SAA7220 chipset. Now you know why it is so $ today.) link
* The Quad 67 was in production from mid 1993 to the end of 1996 and had sold 6,100 units.The Quad 66CD and by the end of its production run in 1996 almost 12000 units had been made.
* ＱＵＡＤ ６７ ＣＤプレイヤ－ 修理 link
2010-10-13
QUAD 606 power ampilfier
Repair parts
R16 / R17 560R 5% 2.5w / W.W.Welwyn Type X2B
WELWYN 軍規精密電阻，低雜音、低感抗，兩端純銅封裝，英國製造. 適用於惡劣的環境 , 防滲透無鉛釉鍍膜玻璃 , 理想的超載保護電路 , 高穩定性和可靠性.
C7 47uF/63v / 5mm PCM
C9 / C11 220uF/63v 電源旁路濾波用
C12 / C13 6800uF/63v BHC ALT20A 整流濾波
R38 / R39 2.2K 5% 0.5w Carbon Film
C8 47p/350v 1% Silver mica
C10 47nF 5% 250v 輸出 電容 (.047uF) 濾高頻? 忘了
T15 NPN Med Power Transistor ZTX652-K 120V/2A/1W
T16 PNP Med Power Transistor ZTX752-K 100V/2A/1W
C2 input capacitor 100nF/0.1uF 100v
IC1 OP-Amp TLC271CP
* In case of Quad 606, 707 or 909 changing the opamp for a better one is useless as it is only to have 0V DC on the output, nothing more, it is not in the path of the signal as in the Quad 405.
* Better Opamp in QUAD 606/909 Power amp link
Swapping this opamp for a OPA134 opens up the sound, tightens the bass BUT on shut-down of the amp, huge noises appear via the speakers which means either offset is high or some problem that I'm not sure of exists. Two number 0.1uF/100V Vishay 1837MKPs were attached directly on the PS pins for Rail-to-Gnd bypass.
The TLC271 is very noisy. The OPA134 is a much better option, even for a servo, and I suspect it could be a clear audible improvement.
The OPA134 offset trim circuit is normally used with a trimpot between pins 1 and 8, with the wiper connected fo V+. This is just a guess, but using this opamp on a board with pins 6 (output) and 8 tied together, I would think at a minimum you would want to pull pin 8 so it is NC (bend it up or whatever).
Yes, pin 8 needs to be disconnected from pin 6 on the PCB. By other words, cut the trace that joins pins 6 to 8. 使用 OPA134 要切開 pin6 pin8 連結.
* The 120k R5 could be replaced by a series pair of 56k & 63k. The junction of this pair has a film cap connected to audio ground. A value of about 1uF might be about right. This mod would make the influence of the opamp even more inaudible.
What does r6 (22k) do? Is it an input bias adjustment?
Quad 606 Power Amplifier Specification:
Power Output: 140 watts per channel (8 ohms)
Distortion: < 0.01%
Input Sensitivity: 500mV
Input Impedence: 20Kohm
Crosstalk: -100db (100hz), -85db (1 khz) and -65db (10khz)
Hum and Noise: 105db
Voltage Rating : 220-200V AC (110-120V via simple power board modification)
Dimensions (WxHxD): 321 x 140 x240 (mm)
Weight: 12kg
R16 / R17 560R 5% 2.5w / W.W.Welwyn Type X2B
WELWYN 軍規精密電阻，低雜音、低感抗，兩端純銅封裝，英國製造. 適用於惡劣的環境 , 防滲透無鉛釉鍍膜玻璃 , 理想的超載保護電路 , 高穩定性和可靠性.
C7 47uF/63v / 5mm PCM
C9 / C11 220uF/63v 電源旁路濾波用
C12 / C13 6800uF/63v BHC ALT20A 整流濾波
R38 / R39 2.2K 5% 0.5w Carbon Film
C8 47p/350v 1% Silver mica
C10 47nF 5% 250v 輸出 電容 (.047uF) 濾高頻? 忘了
T15 NPN Med Power Transistor ZTX652-K 120V/2A/1W
T16 PNP Med Power Transistor ZTX752-K 100V/2A/1W
C2 input capacitor 100nF/0.1uF 100v
IC1 OP-Amp TLC271CP
* In case of Quad 606, 707 or 909 changing the opamp for a better one is useless as it is only to have 0V DC on the output, nothing more, it is not in the path of the signal as in the Quad 405.
* Better Opamp in QUAD 606/909 Power amp link
Swapping this opamp for a OPA134 opens up the sound, tightens the bass BUT on shut-down of the amp, huge noises appear via the speakers which means either offset is high or some problem that I'm not sure of exists. Two number 0.1uF/100V Vishay 1837MKPs were attached directly on the PS pins for Rail-to-Gnd bypass.
The TLC271 is very noisy. The OPA134 is a much better option, even for a servo, and I suspect it could be a clear audible improvement.
The OPA134 offset trim circuit is normally used with a trimpot between pins 1 and 8, with the wiper connected fo V+. This is just a guess, but using this opamp on a board with pins 6 (output) and 8 tied together, I would think at a minimum you would want to pull pin 8 so it is NC (bend it up or whatever).
Yes, pin 8 needs to be disconnected from pin 6 on the PCB. By other words, cut the trace that joins pins 6 to 8. 使用 OPA134 要切開 pin6 pin8 連結.
* The 120k R5 could be replaced by a series pair of 56k & 63k. The junction of this pair has a film cap connected to audio ground. A value of about 1uF might be about right. This mod would make the influence of the opamp even more inaudible.
What does r6 (22k) do? Is it an input bias adjustment?
Quad 606 Power Amplifier Specification:
Power Output: 140 watts per channel (8 ohms)
Distortion: < 0.01%
Input Sensitivity: 500mV
Input Impedence: 20Kohm
Crosstalk: -100db (100hz), -85db (1 khz) and -65db (10khz)
Hum and Noise: 105db
Voltage Rating : 220-200V AC (110-120V via simple power board modification)
Dimensions (WxHxD): 321 x 140 x240 (mm)
Weight: 12kg
2010-10-10
Tannoy 628
Model: 628
Year: 1995 - 98
Dual Concentric: 1206 ICT
Dual Concentric Size: 5"
Crossover Code: 1177
Year: 1995 - 98
Dual Concentric: 1206 ICT
Dual Concentric Size: 5"
Crossover Code: 1177
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