PV Electronics Spectrum 1040, Инструкция по сборке и руководство пользователя

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Nixie Tube Clock ‘Spectrum 18 / 1040’
Issue 7 (15 June 2018)
www.pvelectronics.co.uk
- 16 -
4.10 First Tube test
Now it is time to make a first test of the tube drive circuit. Start by
replacing the HV module, and also if you removed IC2, place this
back in its socket. Also now insert IC3 and IC4 into the sockets,
taking great care the flat at one corner of the IC matches the flat
on the IC socket.
This is a good time to attach the six M3 X 15mm hex spacers, so
the PCB will sit neatly during the tube test.
With great care, and looking carefully at tube alignment (tube
faces forwards), insert six IN-18 Nixie Tubes into the sockets.
Power up the PCB, and watch the tubes. They should count 0
through to 9 and back to 0 again, and repeat this sequence. If any
digits or tubes do not light, go back and check your work. If any
tube does not light, swap it with a known working tube to check if
it is the tube or the location that is faulty.
Once all is well, power off, carefully remove the tubes, and with
care remove the HV module.
4.11 R8 – R11 (4 X 270 KΩ)
R12 – R14, R17 – R19 (6 X 270 Ω)
R16 (10 KΩ)
R20 (1 KΩ)
4.12 Q1 (MPSA42)
Q2 – Q4 (3 X 2N7000)