Nixie Tube Clock ‘Spectrum 18 / 1040’
Issue 7 (15 June 2018)
www.pvelectronics.co.uk
- 15 -
4.7 High Voltage Generator Test.
- Refer to the warnings on page 5
- Insert IC2 into its socket. Orient the notch on the IC with the
notch on the IC socket and the PCB marking.
- Power up the PCB, and using the GND and HV test points,
measure the high voltage generated using a voltmeter on DC
setting. Adjust the brass screw on VR1 until the HV is close to
170V.
Disconnect power, and remember that the HV module can still hold
charge at 170V. carefully remove the HV module and place it safely
away until later.
4.8 Tube Drive Components
R2 – R7 (8.2 KΩ)
C5, C8, C9 (100nF)
Sockets for IC3 and IC4
Be very careful when inserting the two IC sockets. Make sure the
flattened corner of the IC socket is oriented with the matching
flattened corenr marking on the PCB. You can also now insert IC3
and IC4 into their sockets, taking care of orientation.
4.9 C3 (10pF)
C4 (15pF)
X1 (32.768KHz Crystal)