Toy13 D/A with tube amplifier

D/A High voltage use R-L-C-L-C net to generate 230V for Tube 6922 plate-voltage.
Rectifier is 6Z4 and put in delay-on function.


D/A output OP +15/-15V power supply by switching power.


Spdif receiver is CS8416 and Codec is WM8741.


All circuit design usage SMT components.
Serial audio path usage DIP components for high Q factor issue.


The view of Audio signal switching and audio-input of tube.


D/A Top view picture.


Add 6922 heater R & C components.

usage dog bone resistor

Toy12 Plasma tweeter Diy-7

Prepare close shielding-net I buy a big heat sink from internet.
Heat sink drill holes for mount 120w resistors.


Measure pitch distance.


From rear side to Drill holes to fix heat sink.


Finish heat sink and resistors assembly at rear side.


Rear view.


Top view.
I put on a current meter for monitor high voltage.



Another picture.