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Stone

10k Member
Joined
Nov 3, 2009
Messages
12,814
Location
South Jersey, USA
Using SERTEST.EXE and the prescribed loopback adapter I ran tests against the Everex EV-170A card. Tests revealed a problem with both serial channels' IO,...
I've got an EVEREX MAGIC I/O-AT EV-170A 8-bit ISA I/O Adapter Brand New In Box Sealed if that's of interest.

Everex0a.jpg Everex00a.jpg
 

clh333

Veteran Member
Joined
Feb 22, 2015
Messages
1,432
Location
Cleveland, OH, USA
36VCT transformers are not uncommon, exempli gratia--and give you 18-0-18, which will give you more than enough headroom for a 15V linear regulator (e.g. LM7815).

I've seen a number of CT transformers that looked like they would do, but my question, not answered in the specs, is whether they can be rated for 120VAC which is presumed to be the input.

The trick about commonly-available transformers is to think in terms of 9V multiples. So, 9, 18 and 36 volt units are quite common.

Good to know, thank you.

-CH-
 

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
40,252
Location
Pacific Northwest, USA
Many transformers feature dual primaries (such as the one that I pointed to). Series = 220/240V; Parallel = 110/120V.

In one case, I've used a split primary transformer used in a power supply as an autotransformer to supply 240V to a floppy drive motor. Worked fine--use the series connection, but feed line voltage to the center tap and take your 240V from the far end.
 
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