We are a reliable source for many of your litz wire and crystal radio part needs. Since 2008, we've sold more than 19,000 orders with excellent customer feedback. Please visit our eBay Store at mkmak222_Litz Wire to see what is currently available.
We have over a hundred types of litz wire in stock. They contain 5 to 1725 strands of AWG 48 to 28 (0.03 mm to 0.32 mm) wire. The litz wire's equivalent AWG are from AWG 36 to AWG 4.
If you don’t see a particular type of litz wire that you're interested in, please contact us so that we can help arrange a custom order. We can usually have these delivered in three weeks. Large orders may be purchased at the wholesale price.
Most orders will be shipped within one day. The small amount of wire will be coiled on 6” or 7” diameter paper spool to prevent the destruction of the litz wire structure. Larger amounts will be coiled on the original plastic spool.
Note: For avoid damage the structure of the small Litz wire, please observe photo “How to un-coil litz wire from the spool" on my eBay List.
When winding a coil, in order to smoothly un-coil the Litz wire from the paper spool, the simple method is: Vertically fix a 1/4-inch diameter screw rod on a flat plate, and then put paper spool into screw rod flat. When you pull out the litz wire from the paper spool, the paper spool can rotate freely on the screw rod, and the litz wire will not be twisted and knotted.
Here you are bidding on a special nickel-zinc ferrite
toroid. The size is 37 X 23 X 7 mm, use Ni-Zn R40C1 material. Made in China.
The Products made by Ni-Zn R40C1 material are design to use for shortwave transmitter power distribution, power combining, impedance transformation, power output, power chokes, short wave antenna barron and so on; in high frequency applications they have low loss characteristics.
The photo above shows the characteristics of this R40C1 ferrite toroid. Its applied frequency is up to 50 MHz.
The R40C1 Ferrite Toroids made by special formula. We don’t know why this type of Ferrite Toroid has very high Q when wind the coils for LW, MW and part of the SW. Even though the material R40C is very close to R40C1, the Q is much lower with the same coil spec (usually not easy to reach 700Q in MW). I introduce the R40C1 here because the Crystal Radio enthusiast always wants to make coils that have high Q and want them as high as possible. The coils I wound with R40C1, are able to get 900 Q at 3 MHz.
For sure the R40C1 can use for many other applications. This field is waiting for discover by amateurs.
Use this R40C1 37 X 23 X 7 mm ferrite toroid and litz wire to make coils will give you a big surprise! It can get very high Q value and let the radio circuits significantly increase the selectivity and sensitivity.
I stick two 37 X 23 X 7 mm toroids together with a layer of Teflon membrane (PTFE). It is equivalent to 37 X 23 X 14 mm and intertwines 60 turns of 250/AWG 46 Litz wire (the wire length is 16 feet). Inductance of this coil is about 223 µh.
The results measured from a HP 4342A Q meter are:
530 KHz
1305 Q
555 KHz 1317 Q
605 KHz 1328 Q
705 KHz 1335 Q
805 KHz 1321 Q
905 KHz 1293 Q
1005 KHz 1247 Q
1105 KHz 1203 Q
1205 KHz 1146 Q
1305 KHz 1098 Q
1405 KHz 1051 Q
1505 KHz 1004 Q
1605 KHz 950 Q
In 1605 KHz still has 950 Q.
Then I thought of Ben Tongue's Contra Wound Coil. I intertwine two coils opposite direction; each one is 29 turns 250/AWG 46 Litz wire (the wire length is 16 feet). Inductance is 205 µh when two coils is series connection (29 + 29 turns), and 63 µh when two coils is in parallel (29 turns but equivalent with the 500/AWG 46 Litz wire). Measurement results are:
Series connection Parallel connection
545 KHz
1257 Q
____
555 KHz 1265 Q ____
605 KHz 1290 Q ____
705 KHz 1322 Q ____
805 KHz 1331 Q ____
905 KHz 1324 Q ____
1005 KHz 1299 Q 1085
KHz 1424 Q
1105 KHz 1274 Q 1105
KHz 1426 Q
1205 KHz 1241 Q 1205
KHz 1425 Q
1305 KHz 1205 Q 1305
KHz 1416 Q
1405 KHz 1168 Q 1405
KHz 1405 Q
1505 KHz 1129 Q 1505
KHz 1389 Q
1605 KHz 1090 Q 1605
KHz 1371 Q
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1705 KHz 1351 Q
____
1805 KHz 1331 Q
____
1905 KHz 1308 Q
____
2005 KHz 1283 Q
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2105 KHz 1262 Q
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2205 KHz 1236 Q
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2305 KHz 1211 Q
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2405 KHz 1184 Q
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2505 KHz 1162 Q
Up to 2.5 MHz still can get 1162 Q.
An amateur used two R40C1 37 X 23 X 7 mm ferrite toroids and 165/46 litz wire to wound a coil, the Q are all over 1212Q between 500 – 1700 KHz, the highest point is 1471Q at 900 KHz.
For more information of this R40C1 37 X 23 X 7 mm ferrite toroid, please search "The RadioBoard Forums" on google and read all interesting articles of “R40C1” in Crystal Radios section.
If you need 175/46, 250/46, 270/46, 300/48, 420/48 or 675/48 litz wire to make coils for this ferrite toroid, please visit my eBay store mkmak222_Litz Wire to search these litz wire.
Please e-mail any questions you may have before you order.