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  • 09/05/2021

    São pequenos transformadores que poderão ser utilizados na adaptação de impedâncias de transístores, ou para outras aplicações. Usados em pequenos rádios ou em pequenos amplificadores de transístores. Atenção que temos que utilizar um multímetro na escala de Ohms para ver qual a entrada de alta impedância e a de baixa. Serve para casar as impedâncias indutivas em circuitos transistorizados para esquemas antigos no estilo clássico, Sem problemas na entrega nem na embalagem. Recomendo este artigo.

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  • 02/02/2018

    increibles y dificiles de encontrar,pequeños, para mis diseños de radio

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  • 22/03/2018

    All ok thank You!

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  • 08/02/2021

    Arrived in time, working quit well. The thin coil contact wires are some fragile. I used it direct connected to wires. Is better to solder this part on a printed circuit board and then the wires connected to the printed circuit board.

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  • 26/07/2021

    Practices for BF uses

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  • 06/07/2021

    He's doing his job.

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  • 03/06/2021

    8ohm=10mh 1008ohm =88mh prima! RB

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  • 06/01/2021

    Very well packed, they arrived in perfect condition.

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  • 01/11/2017

    Wrong declared product. This is not 1300 to 8 ohm. Transformer has turn ratio about 5:1. Ideally, it would then be 25:1 impedance ratio, so in this case it would be 200:8 ohm transformer. But because of big losses in copper and core, primary side sees 400 ohm when secondary side is loaded with 8 ohm. Efficiency of the transformer loaded with 8 ohms is about 50% at 1kHz, mostly due to copper losses. Primary DC resistance is about 80 ohm and secondary is about 3 ohm. Core is EE type, with no I lements used. That makes lower maximum possible power for that core size. Also the coil could have more copper wire, there is room for it. This would make transformer more efficient, but it seems that producer saved on expenses to the maximum.

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  • Beaner

    Decent product, true ratio for me is 80:3 which works for me but if you needed true 1300:8 then watch out. A couple have ended up not working but for the most part they are good.

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