[ARC5] 274N Paper

[Brian Clarke]

Hi Steve,

Most interesting.

What you have provided is one of the solutions to a standard problem with
the switching
of relays - handling the back emf. However, the ARC-5 and SCR-274N series
were
designed to run off 22 to 30 V dc. By putting a diode in series with the
relay coils, you
may just have marginal operationality when the battery gets to 22 V dc.

Another solution that many designers use, that doesn't require lifting any
wires, and
that gets around the series Voltage drop, is to connect your diodes across
the relay
coils. Also reversible.

73 de Brian, VK2GCE.