need transformer
29 views
Skip to first unread message
Timjusttim
Feb 29, 2012, 1:11:57 PM2/29/12
to LVL1 - Louisville's Hackerspace
I need 115 vac to 20 vac transcormer or wallwart. Cash or trade.
Timjusttim
Feb 29, 2012, 1:13:16 PM2/29/12
to LVL1 - Louisville's Hackerspace
jesco w
Feb 29, 2012, 1:53:07 PM2/29/12
to lv...@googlegroups.com
i have a new elk-trg2440 24vac 40va and a new elk trg1640 16.5vac 45va if you want one an they will work , ill swing one by
Timjusttim
Feb 29, 2012, 2:37:07 PM2/29/12
to LVL1 - Louisville's Hackerspace
I have a 24 vac already and was trying to avoid using a resistor to
lower voltage down to 20 vac. The problem is that we are not sure of
the voltage tolerance of the device we are powering. Only thing we
know is that it was originally powered by 20 vac. So thanks, but still
looking for 20 vac.
lower voltage down to 20 vac. The problem is that we are not sure of
the voltage tolerance of the device we are powering. Only thing we
know is that it was originally powered by 20 vac. So thanks, but still
looking for 20 vac.
Jeff Johnson
Feb 29, 2012, 2:46:32 PM2/29/12
to lv...@googlegroups.com
Check the boneyard if you haven't already. Jon's done a great job of putting a huge collection of transformers/wallwarts in baskets, already sorted.
Timjusttim
Mar 1, 2012, 5:37:54 PM3/1/12
to LVL1 - Louisville's Hackerspace
Jeff, thanks, I had already scoured the boneyard before I posted.
Still looking for a 115vac to 20vac transformer. Anyone????
Still looking for a 115vac to 20vac transformer. Anyone????
2600
Mar 1, 2012, 7:01:47 PM3/1/12
to LVL1 - Louisville's Hackerspace
Bear in mind that the voltage rating specified will be under the rated
load.
Unloaded, the output voltage will be higher than the full-load rating.
How much higher it will be can vary a lot from one wall wart to the
next.
Not sure what application would be that critical about 4 Volts. As for
using a resistor, this is only effective for a fixed load current. If
the actual current drain will change while it's in use, the resistor's
voltage drop will also change.
Speaking of which, you have not specified the power/current
requirement this transformer should provide.
Makes a difference.
73
load.
Unloaded, the output voltage will be higher than the full-load rating.
How much higher it will be can vary a lot from one wall wart to the
next.
Not sure what application would be that critical about 4 Volts. As for
using a resistor, this is only effective for a fixed load current. If
the actual current drain will change while it's in use, the resistor's
voltage drop will also change.
Speaking of which, you have not specified the power/current
requirement this transformer should provide.
Makes a difference.
73
Christopher Cprek
Mar 2, 2012, 8:00:55 AM3/2/12
to lv...@googlegroups.com
I have 110 to 12.4, 24, and 40 VAC, but no 20..
Chris
Reply all
Reply to author
Forward
0 new messages