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PCB for dynalo with bc550c-560c (single-sided) + return gnd question - Page 2

post #16 of 19
Quote:
Originally Posted by 00940 View Post
 

I finally etched and drilled those pcb.

 

Nice job on the etching!

Drilling all those holes can be a pain, I know from experience.

post #17 of 19
Thread Starter 

I finished assembly and basic testing today. No problems. The bc550-560 require a much lower resistor to set the output stage quiescent current. Something like 330-360 rather than 510 like in the original dynalo. Rather than using trimmers to pre-trim offset, I put sockets in // with the ccs resistors, to allow a simple resistor. Actually initial offset was only -4mv and -14mv (trimmed to 4mV). With the opamps in place, it settles at 3mV in each channel.

 

The Pooge regulator is set at +/-15.4V.

 

 

Now, I've to order the case. I hope to make it fit inside a Galaxy GX347 (330x170x40mm).

post #18 of 19

Nice work Ben!

How does it sound?

post #19 of 19
Thread Starter 

To be true, I'm only listening to it tonight.

 

It sounds good, like any dynalo should  :wink_face:

 

 

Pics in the "builds" thread.

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