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Details about  Eagle LT700 / LT44 Radio Output / Inter-stage Tapped Audio Matching Transformer

Eagle LT700 / LT44 Radio Output / Inter-stage Tapped Audio Matching Transformer

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Item location:
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Last updated on  13 Apr, 2014 17:18:21 BST  View all revisions
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Item specifics

Condition:
New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
Brand:

Eagle

MPN:

LT44 LT700

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Eagle LT44 LT700 Transformers

Eagle LT700 or LT44 Audio Matching Transformer

This is one item of new Eagle audio output matching or transistor inter-stage matching transformer. These used to have the type number LT700 and LT44.

LT700 Tapped Input Output Loudspeaker
Matching Transformerlt44 transformerP631M / LT44 with blue tape

LT700:

The primary side has a nominal impedance of 1.2k Ohms and a tapping point in the middle of this. The output side is nominally 3.2 Ohms and is intended to be connected to a typical portable radio speaker or low impedance headphones. The D.C. resistance of the primary is approximately 70 Ohms, and that of the secondary is 0.5 Ohms. The theoretical voltage and turns ratio is 19.4 and something close to this is seen when testing at 1kHz with the appropriate input and output impedances connected.  These are sometimes used in low-level electrical stimulation generators.  Here is the old style paper information sheet:

LT700 Transistor Radio Output Matching Transformer
Data Sheet

LT44 - Yellow

The primary side has a nominal impedance of 20K Ohms. The secondary side is nominally 2k Ohms and has a centre tap. The D.C. resistance of the primary is approximately 480 Ohms, and that of the secondary is 107 Ohms. The theoretical voltage and turns ratio is 3.2 and something close to this is seen when testing at 1kHz with the appropriate input and output impedances connected.  These have input and output impedances that are more useful for making ring modulators than the LT700s.  Here is a link to the old style paper information sheet:

LT44 Inter-Stage or crystal radio
transformer data sheet


LT44 / P631M
Blue 

This is the same as the one with the yellow tape but has the more usual blue winding tape and the untapped primary side has a higher d.c. resistance at about 1.08K.  If you're looking for low internal resistances to minimise losses, you would prefer the yellow type.

These were originally used to match germanium transistor stages in radios, a role that no longer really exists but these are still useful to match crystal radio detectors to higher impedance magnetic or crystal earpieces.  This allows the detector diode to work at a higher impedance section of the circuit where the higher voltages overcome the forward diode drop more easily leading to higher efficiency.  The transformer also provides a d.c. path to ground when using a crystal earpiece, doing away with the need for a lossy bleed resistor across the crystal element.

I have the crystal piezo earphones on another listing in the shop.

Dimensions, both units:

Height above the board 16mm

Length across the core section 20mm

Width across the plastic bobbin 16mm

Lead Pitch approx: 4mm input side and 8mm output side.

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Paypal payment is welcomed.  I am happy to ship worldwide by small packet airmail.


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You're welcome to return any item for any reason within fourteen days of receiving it, for a refund of the item purchase cost. If there has been a mistake on my part I'll correct the mistake if I can, or make a full refund where that's not possible. Please see the 'Dispatch and Post' page for full details: http://stores.ebay.co.uk/Useful-Components/Dispatch-and-Post.html
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Item location: Southampton, United Kingdom
Postage to: Worldwide
Excludes: Italy
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