2010年10月14日 星期四

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.



Add Tub output OPT for good sound.

2010年10月2日 星期六

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.

走過咖啡店早年歲月

咖啡店從無到有... 從有到無... 歲月的流逝 ,剩下的祇有記憶.

從無到有--- 舊店設立.
從有到無--- 拔營....牧咖啡的咖啡人.....移址, 啡客...........的遷徙.

咖啡店=咖啡+音樂

咖啡=日式咖啡+美式咖啡
日式咖啡=日式單品+日式花式咖啡
美式咖啡=美式單品+美式花式咖啡
.........."請不要找茶".

音樂=古典音樂+真空管