Nixie Tube Clock ‘Halo Chroma’
Issue 1 (1 April 2021)
www.pvelectronics.co.uk
- 14 -
4.3
Testing Low Voltage Power Supply.
Identify the test GND, 5V and HV test points as shown below.
Plug in the power supply, and then test using a DC voltmeter:
Touch the black probe on the GND test point and the red probe on
the 5V test point. The voltage should measure between 5.4 and 5.8
Volts. If not, disconnect power and check your work. Do not
proceed with the assembly until the error is corrected. Once the
test is completed, disconnect the power.
IF YOU CHOOSE TO PROCEED BEYOND THIS POINT
WITHOUT GETTING THE CORRECT VOLTAGE, WE WILL NOT
BE ABLE TO OFFER SUPPORT
4.4
High Voltage Generator components.
Socket for IC2
R1, R2 (4.7 KΩ)
R3, R4 (390 KΩ)
R5 (300 KΩ)
C3 (1uF)
C4 (220uF)
Q1 (IRFD220)
L2 (100uH Inductor)
D5 (UF4004)
Solder the 5 resistors and the diode first as they are lower profile –
its easier to solder the top pad rather than the bottom pad. This
prevents the component falling out as you try to solder an inverted
PCB! L2, C3 and C4 need to have their leads bent, and for C3 and
C4 the polarity is critical, so do as you did with C1 and C2 to
ensure the pale strip on the part matches the cross hatching on the
PCB.
