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Post by paradisecs on Mar 9, 2019 17:06:25 GMT
If I understand correctly chokes are used to block or limit frequency. I assume that means interference which I can understand for amps and even the controllers but what does filtering frequency on the detent switch actually do that a resistor would not do? Also, what category of part are they listed under? I've checked digikey and arrow and they have categories for common mode chokes, fixed inductors, and a few others.
Stephen
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Post by robnyc on Mar 10, 2019 7:24:24 GMT
Stephen, as it appears to me, this is done to utilize the coil as inductor. In this case is allows the voltage an extra kick initially when the R-O pulse is applied followed by simple current after that.
The coil is a 100 millihenry (mH)If you have some old LPC selection receivers or others, those chokes are in there too.
Why do you need one? They never go bad unless abused.
RobNYC
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Post by paradisecs on Mar 10, 2019 15:56:08 GMT
I have an SHP where the L5101 case is broken and in looking for the part I started reading up on what the chokes were doing. I just couldn't figure out why it was on the detent with the limited knowledge I have. Thanks for the info.
Stephen
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Post by Ron Rich on Mar 10, 2019 16:04:08 GMT
Rob, Stephen, They are used to "shape" the pulse, in this instance-- Most of the time even with an shorted choke, the phono will function --however, sometimes it will also detent at times it should not--( they do, short, and open, --very rare !--for what reasons, I dono ?) I think I found them at "Mouser" once--then I found a flock of them at a local surplus shop (that's now gone  ), here -- AND--BTW--NOT ALL models use a 100 mH choke--check your parts manual--Ron Rich |
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