Board size: 153mm*113mm*32mm (W*L*H)
Installation opening holes distance is 141.224mm*100.584mm.
this Power supply circuit is base from the conrad-johnson preamp power supply part. so we are not have the schematic for it.
The board default seting as following:
High voltage: DC280V ( high voltage can be adjust between 180V-350V. )
filament Voltage: about DC6.3V ( it can be adjust between 1.5V-12.6V)
High and low voltage start-ups are slowly superimposed, that is, soft start, so that the impact on the gallbladder is less.
Note:
1: Especially for the novice to explain, this high voltage AC input is need add a transformer, can not directly input the city main power 110V or 220V! ! ! !
2. From the regulation performance and power consumption heat, we must control the voltage difference (20V or so is ideal): for DC250V input AC200V is good , For DC280V , AC230 is good, for DC300V , AC260 is good.
(Calculation formula：input AC*1.4-output DC=20-50mV）
3. The Main capacitor of this board is 400V voltage. Please note that the input voltage should be controlled below AC280V.
on this assembeld board the LM317K are used. it is 100% origianl and works in good performance.
BOM for bare PCB:
500Ω adjustable resistor x1,
2K adjustable resistor x1
Capacitor: 100uF/450Vx3, 33uF/450Vx1, 2200uF/25Vx3, 10uFx1, 0.01uF/400Vx2
1N4007x4
1N4736Ax1
DB107 rectifier bridge x1
MURF1660CT/MURF1660CTRx1 pair
MPSA92x1
TIP50x1
LM317x1
LM317Kx1
5.08mm pitch 2P terminal block x4
WZ-70 Radiator x4
WZ-72 Radiator x1
TO-3 Silicone Sheet x1
