Voltage Supply - tams elektronik Multi-Timer Manual

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7.2. Voltage supply

You can use a d.c. or an a.c. transformer with 12 to 18 V as a power
supply for the Multi-Timer.
Caution:
!
Do not use the same transformer for the power supply of the Multi-
Timer as used for the power supply of downstream circuits or the rails.
The arising stray electric currents could possibly damage the output
transistors of the Multi-Timer.
Caution:
!
If you use a d.c. transformer for the power supply of the Multi-Timer,
you generally have to respect the polarity when connecting it. If using
an a.c. transformer the polarity is of no importance first.
When connecting several outputs to circuits supplied by the same
transformer, all connections have to be polarized the same way as a rule.
Otherwise a short circuit could occur damaging connected devices.
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Multi-Timer