In a day gone by I was taught the source Z should be 1/10th the load Z. It seems common knowledge today is Zs=Zl for max power transfer. When I was a teen the books said you get max power when Zs=Zl and your generator/battery consumed 1/2 the power, for this reason we set Zl at least 10 times Zs. With the 10 to 1 ratio we still use 9% heating the source. With that in mind and looking the manufacturer datasheets I decided to do a none scientific test using spice to see if I can find the 'perfect' transformer. Andy sent me a circuit which I used for the test. Then I built a circuit and tried it. Here are the circuits used in the test:
my circuit.
Andy's circuit.
The results:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMF1XpDIuFLQYRl4R8IOeZ7ABEP1ADTdfpSWSRzD8J3_7RK4aOEym0r_YMPrY_kCiBTH5NWatE54Qb1WRtqE_ap7fYThvcBzS0rTd_Bjix35kzB_UiVgEiHhle7VESshwetbeNsfyM4RI/s640/BG+tri+coil+and+some+filter+to+enhance+output..jpg) |
100 uh 10 uv in 15 uv out |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSr-vEVfVqhBYrKoeYBopXhXJtcPeXohI-Tx4jP4_MIK4OTwyvki8DXmqyEe0K47d7nbrTt9Rp1G2LtVMuDSwK-uCYLtAj39Lzl2r6X-4Ea-K2FrF5Op6YHH8KPGP6rKw9-omiXOXC_MA/s640/hand+wound+coil+1+uh+and+some+filter+to+enhance+output..jpg) |
1uh 10uv in 15 uv out |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitUzqA6BpCuMuAUAkdHi5lMtFHe3qPevRQMfkb9Hbi9kyZvczbCblWhhmKr9dz-XhoRIl-Th-5vGKWzUL2-6BLcpR4ndouqcFLJJxuwdG8BQHL62VCHFR97iJLeRU0NfDhyphenhyphenveWaI5-bfo/s640/hand+wound+coil+1+ph+and+some+filter+to+enhance+output..jpg) |
It was looking like it could not go to low so 1ph no output. |
I looked through several spec sheets and found coils wound wit 3 turns, 6 turns, etc. The only spec they gave was the Z at a certain frequency. The recommendation was for the transformer Z to be 4 times Zs at the lowest frequency. The test seem to support the fact that more inductance doesn't give more output. It did show that some of the circuits drew a larger current and loaded the source more.
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