Steve, I would in that case protect the switch from accidetal use, perhaps not make it available from the outside.
To your first question. All the pins, or soldering points, in question are connected to the same (primary) coil on the transformer. The different supply voltages are adjusted to by using the bigger or smaller section of the coil. Just find all the pins that are connected by measuring the DC resistance. (disregard the initial jump of the needle).
The 110V pins are using a smallest part of the coil, the 240V input is simply using the whole of the coil, and therefore has a higher resistance of course (or inductance for that matter), the 220 input slightly less. I cannot see that there is room for much error.
Using the 240 connection instead of 220 will probably not give any noticeable difference in practice, btw.
To your first question. All the pins, or soldering points, in question are connected to the same (primary) coil on the transformer. The different supply voltages are adjusted to by using the bigger or smaller section of the coil. Just find all the pins that are connected by measuring the DC resistance. (disregard the initial jump of the needle).
The 110V pins are using a smallest part of the coil, the 240V input is simply using the whole of the coil, and therefore has a higher resistance of course (or inductance for that matter), the 220 input slightly less. I cannot see that there is room for much error.
Using the 240 connection instead of 220 will probably not give any noticeable difference in practice, btw.
janneman, you are possible (probably) right! I take back what I said! But I wonder, if you by measuring the resistance first to find how to find how to couple the windings in series , would not the intrument at the same time reveal a potential wrong phase by an absence of the strong inductive reaction to the measuring current? In other words, would you not be able to find the right solution just by using a simple instrument?
Hi,
try reading this from yesterday
http://www.diyaudio.com/forums/showthread.php?postid=998832&highlight=#post998832
it may give you what you need.
try reading this from yesterday
http://www.diyaudio.com/forums/showthread.php?postid=998832&highlight=#post998832
it may give you what you need.
Yes, you can measure the impedance with an AC voltage to see if you have it right. You either can use an L meter if you have it, otherwise use a signal generator and drive the primarie(s) with say 1kHz through 1kOhms, then measure the voltage at the primarie(s). The connection with the highest voltage is the right one (Ideally the wrong connection gives 0 volts ie a short).
Jan Didden
Jan Didden
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.