Nixie Tube Clock ‘Nixie QTC+’
2 (01 October 2018)
www.pvelectronics.co.uk
- 58 -
12.3 Problems getting the correct High Voltage
This is the most common issue. Did you insert IC2? IC2 is needed
to generate the HV. If IC2 is in its socket and you don’t get HV,
please record the following DC voltages with IC2 out of its socket.
5V test Point
Should be 5.6V
HV test point
Should be approx 12V
IC2 Socket, Pin 1
Should be ~5.6V
IC2 Socket, Pin 2
Should be ~0.14V
IC2 Socket, Pin 13
Should be 0V
IC2 Socket, Pin 20
Should be ~5.2V
If pin 2 is not to spec, check the feedback resistors R2 and R3 are
correct and correctly soldered.
If pin 20 is not to spec, check why the PIC is not getting power via
D3 (Orientation?)
If contacting us about an HV issue, please measure give us these
voltages in your email.
Summary of Contents for Nixie QTC Plus
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