Q_Dispre

[Josip_Del]

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]

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]

Thanks PMA I avoid CDIL every time I can

 

[PMA]

I am now releasing the Dispre 2_V3 completely:

 

[Josip_Del]

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]

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]

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]

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