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Low Earth Orbit
DIY Audio
Line level iso transformer
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<blockquote data-quote="Tom Manchester" data-source="post: 33966" data-attributes="member: 82"><p>Re: Line level iso transformer</p><p></p><p></p><p></p><p></p><p>These came from an FSR audio silent audio switcher. The printing on the unit actually advertised it as having 600 ohm transformer iso outputs. Inside the unit, there were 2 identical transformers. They were hooked up "backwards" with respect to each other. By that I mean, they used the primaries and secondaries interchangeably for each channel, so from that I deduced that the primary and secondary must have the same impedance if it didn't matter which set of windings they used for input and output.</p><p></p><p>The output on both transformers went directly to the barrier strip to the +/- outputs. The audio switching circuit that fed the transformers was pretty simple, I seem to recall it had an op amp, a handful of passive components, and maybe a few small general purpose switching transistors. That's about all I can remember though. </p><p></p><p>I'm thinking I can probably just wire this right in with the XLR's without any associated circuitry and run some tests to check performance. Chances are this will be more of a band-aid in unique situations like interfacing with questionable hotel ballroom and church PA's, so I am not too worried about performance.</p></blockquote><p></p>
[QUOTE="Tom Manchester, post: 33966, member: 82"] Re: Line level iso transformer These came from an FSR audio silent audio switcher. The printing on the unit actually advertised it as having 600 ohm transformer iso outputs. Inside the unit, there were 2 identical transformers. They were hooked up "backwards" with respect to each other. By that I mean, they used the primaries and secondaries interchangeably for each channel, so from that I deduced that the primary and secondary must have the same impedance if it didn't matter which set of windings they used for input and output. The output on both transformers went directly to the barrier strip to the +/- outputs. The audio switching circuit that fed the transformers was pretty simple, I seem to recall it had an op amp, a handful of passive components, and maybe a few small general purpose switching transistors. That's about all I can remember though. I'm thinking I can probably just wire this right in with the XLR's without any associated circuitry and run some tests to check performance. Chances are this will be more of a band-aid in unique situations like interfacing with questionable hotel ballroom and church PA's, so I am not too worried about performance. [/QUOTE]
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