Nixie Tube Clock ‘Spectrum 18’
Issue 2 (15 February 2015)
www.pvelectronics.co.uk
- 37 -
9. ALARM AUX OUTPUT
The clock can be configured to provide an output at the O/C pad at the
rear of the PCB when the alarm is triggered.
The output can be configured to go high for between 1 and 60 seconds
by setting the value of configuration parameter 19 as follows:
0 – No Aux Output (default)
1 – 1 second
2 – 2 seconds
3 – 5 seconds
4 – 10 seconds
5 – 20 seconds
6 – 30 seconds
7 – 40 seconds
8 – 50 seconds
9 – 60 seconds
The ALARM AUX pads at the rear of the PCB are provided as follows:
12V: Main connection to clock’s fused 12V line
5V: Main connection to clock’s 5V line
O/C: Connection to an open collector output (transistor is MPSA42)
GND: Main connection to clock GND.
This is an advanced feature. If you require further information, please
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