An all solid-state dynamic headamp design by Dr Kevin Gilmore.
Official thread: http://www.head-case.org/forums/topic/9768-kg-balanced-dynahi-build-discussion-thread/
There are 2 options for the Dynahi. Onboard or offboard heatsinks.Schematics:
Amplifier:
http://gilmore.chem.northwestern.edu/dynahiver2a.pdf
Latest silkscreen:
- Onboard:
Board dimensions(mm): 181 x 150
- Offboard:
Board dimensions(mm):
- Power supply:
Either use the offboard PSU below, or AMB Sigma22. Recommended dual PSUs.
Board dimensions(mm):
Latest BOM:
Important notes:
Am I correct in assuming that in the BOM, column E is the values of the required resistors, and column F is the number required?
ReplyDeleteAlso, what sort of power handling and tolerances does the Dynahi require?
Lastly, is there a maximum resistor size? (e.g., don't go above 1/4W or use Vishay RN series, otherwise the resistors won't fit?)
Many thanks in advance for your help.
Yes, that's correct. I forgot that the quantity is for 2 amps, so just use half of it for a single build.
ReplyDelete1/8w and 1% resistors is fine. The board could take up to 1/2w resistors.
A dual S22 configured for 30v is recommended. Dual 30v+30v/80va transformers would be perfect too.
Thanks for the very quick response, Lil' Knight.
ReplyDeleteI have a few questions if you permit :
ReplyDelete1- What components to change for a balanced gain of around 10 (onboard version) ?
2- Is it better to use 500mW resistor (if they fit) ?
3- For S22 PSUs, can you recommand a DEL ? I absolutely don't know how to chose one !
Thanks
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