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Old 22nd June 2011, 01:55 PM   #1
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Default Q_Dispre

Diying Dispre and just wondering do I go for BC550C/BC560C or to stick to the original schematic BC546/BC547. Will 550 result in any kind on sound quality problem or DC offset.Schematic is this.http://web.telecom.cz/macura/schema.pdf

Last edited by Josip_Del; 22nd June 2011 at 02:05 PM.
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Old 22nd June 2011, 02:26 PM   #2
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BC550/560 is a recommended substitute to 547/557. Buy reliable producer's product, like ON Semi. Avoid CDIL, some of their 560 transistors have reversed pins! Package must have pins as shown.
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File Type: png BC550_560.PNG (9.8 KB, 363 views)
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Old 22nd June 2011, 02:33 PM   #3
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Thanks PMA I avoid CDIL every time I can
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Old 22nd June 2011, 02:37 PM   #4
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I am now releasing the Dispre 2_V3 completely:
Attached Files
File Type: pdf dispre2_v3_bom_en.pdf (12.8 KB, 271 views)
File Type: pdf dispre2_V3_board.pdf (35.1 KB, 210 views)
File Type: pdf dispre2_v3_p1.pdf (32.3 KB, 240 views)
File Type: pdf dispre2_p2.pdf (12.0 KB, 224 views)
File Type: pdf doc_V3_en.pdf (42.0 KB, 215 views)
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Old 22nd June 2011, 03:03 PM   #5
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Thanks PMA once again, but isn’t the schematic the same the one I put a link to, and that you posted? In any case thanks for preamp
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Old 22nd June 2011, 03:15 PM   #6
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Yes, but now you have it completed - with DC servo drawing, BOM and assembly instructions. It may help to those who might be interested in building this preamp.

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Old 22nd June 2011, 03:38 PM   #7
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Sorry for annoying you, but for what is dc servo, I presume potential DC offset. How large is DC offset without DC servo, and for what should I watch on matching. I only see NPN, PNP at input and that is wary difficult to match, almost impossible
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Old 22nd June 2011, 04:40 PM   #8
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You should use it, especially if you have DC coupled power amplifier.
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