Augustica
®
T e c h n o l o g i e s
Page 7 of 9
Connect a transformer or variac to the terminal block K3 and slowly bring AC voltage to
12 Volt AC. Measure the DC voltage produced by the rectifying bridge D8-D11. If you
applied 12 Volt AC to the rectifying bridge, you should obtain about 17 Volts DC after
rectification.
Sixth, solder diodes D12 and D13 and then solder resistors R5 and R6 followed by
capacitors C15, C16, C17, C18, C19, and C20. Now solder green LED D14 and resistor
R7 followed by terminal block K4. Connect a transformer or variac to the terminal block
K3 again and measure the voltage produced by the left channel of the power supply (at
the terminal block K4) as a whole. If you applied 12 Volt AC to the terminal block K3,
the power supply should deliver about 17 Volt DC at the terminal block K4. Measure AC
component that is present in the filament DC voltage after it is regulated and filtered by
the IC2 LD1084V. The AC component of the filament DC voltage should be about 0.6
millivolts AC. If your measurements show substantially higher value of the AC
component present in the DC voltage, your IC2 LD1084V is probably burned out and it
has to be replaced. Otherwise, the IC2 LD1084V is stabilizing and filtering the filament
DC voltage properly and now you can solder the to the PCB the heatsink on which the
IC2 LD1084V is situated.
Seventh, assemble the right channel of the low DC voltage (filament) bus of the power
supply and start with attaching IC3 low drop voltage regulator LD1084V to its heatsink.
Once you attached the LD1084V to its heatsink, you can insert heatsink leads and
LD1084V leads into the power supply PCB. Solder the IC3 regulator's leads to the PCB.
At this point do not solder the heatsink's leads to the PCB - you will do it later.
Eighth, solder the rectifying bridge D15-D18 and capacitors C21, C22, C23, and C24.
Pay attention to the polarity of the rectifying bridge D15-D18. Solder terminal block K5.
Connect a transformer or variac to the terminal block K5 and slowly bring AC voltage to
12 Volt AC. Measure the DC voltage produced by the rectifying bridge D15-D18. If you
applied 12 Volt AC to the rectifying bridge, you should obtain about 17 Volts DC after
rectification.
Ninth, solder diodes D19 and D20 and then solder resistors R8 and R9 followed by
capacitors C25, C26, C27, C28, C29, and C30. Now solder green LED D21 and resistor
R10 followed by terminal block K6. Connect a transformer or variac to the terminal
block K5 again and measure the voltage produced by the right channel of the power
supply (at the terminal block K6) as a whole. If you applied 12 Volt AC to the terminal
block K5, the power supply should deliver about 17 Volt DC. Measure AC component
that is present in the filament DC voltage after it is regulated and filtered by the IC3
LD1084V. The AC component of the filament DC voltage should be about 0.6 millivolts
AC. If your measurements show substantially higher value of the AC component present
in the DC voltage, your IC3 LD1084V is probably burned out and it has to be replaced.
Otherwise, the LD1084V is stabilizing and filtering the filament DC voltage properly and
now you can solder the to the power supply PCB the heatsink on which the IC3
LD1084V is situated.
