Q_Dispre

Josip_Del · 01:05 PM

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

PMA · 22nd June 2011, 01:26 PM

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.

Josip_Del · 22nd June 2011, 01:33 PM

Thanks PMA I avoid CDIL every time I can

PMA · 22nd June 2011, 01:37 PM

I am now releasing the Dispre 2_V3 completely:

Josip_Del · 22nd June 2011, 02:03 PM

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

PMA · 22nd June 2011, 02:15 PM

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.

Regards,

Josip_Del · 22nd June 2011, 02:38 PM

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

PMA · 22nd June 2011, 03:40 PM

You should use it, especially if you have DC coupled power amplifier.

22nd June 2011, 12:55 PM	#1
Josip_Del diyAudio Member Join Date: Aug 2009	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 01:05 PM.

22nd June 2011, 02:15 PM	#6
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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. Regards, __________________ Pavel Macura, consultant http://cz.linkedin.com/pub/pavel-macura/4/783/637

22nd June 2011, 03:40 PM	#8
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	You should use it, especially if you have DC coupled power amplifier. __________________ Pavel Macura, consultant http://cz.linkedin.com/pub/pavel-macura/4/783/637

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22nd June 2011, 01:33 PM	#3
Josip_Del diyAudio Member Join Date: Aug 2009	Thanks PMA I avoid CDIL every time I can

22nd June 2011, 02:03 PM	#5
Josip_Del diyAudio Member Join Date: Aug 2009	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

22nd June 2011, 02:38 PM	#7
Josip_Del diyAudio Member Join Date: Aug 2009	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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