22 Apr
2012
22 Apr
'12
11:43 a.m.
[Doorbell controller]
OK, use a CPjr, then. I think that has a motor relay...
Hang on... The 5170 floppy drive has a head load solenoid. The driver for
that much be able to sink enough current to fire a relay. So you cna use
a 5170, and just kludge a small relay into the floppy drive...
I suspect you could easily add a relay drive to one of the keyboard IEDs.
Rignt the doorbell on CAPS LOCK or something....
[Yes, I am well aware how to drive relays from TTL or RS232 level signsl.
I am just tryign to avoid suggsting it...]
-tony
Wouldn't
it be easier to use a 5150? You've got the cassette motor relay
which you could then use energise the bell.
It would, indeed, be far preferable. (and was what I had in mind)
But the supply of them is dwindling. I only have one left!