Banggood

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

All ok thank You!

Good little audio transformers, ideal for traditional transistor radio circuits etc. Knocked a star off appearance due to a couple of items having bent pins due to poor packaging. Managed to fix with a pair of long nose pliers.

Despite the current global COVID situation I was surprised when the order came in less then 3 weeks. Thank you, I'm very satisfied.

Muy bien empacados, llegaron en perfectas condiciones.

Thanks, Received in good condition after a wait for about 6 months due to Covid19.

OK

thxxx

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.

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.