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Old 16th February 2006, 08:05 PM   #1
bobcat is offline bobcat  United Kingdom
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Default Ceramic to line

Ok everyone this is going to sound daft, but i have av high quality audio mixer which has two inputs switchable between mag & ceramic cartridge inputs, what i want to do is retain the mag input but convert the ceramic to a line input ! any ideas or circuits would be greatfully appreciated.
Bobcat
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Old 17th February 2006, 12:46 PM   #2
clem_o is offline clem_o  Philippines
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High quality and it has ceramic cartridge inputs? Well, if you insist.. :-)

You don't need anything to convert it to a line input. Ceramic input stages were designed 'flat', as that kind of cartridge's frequency response (more or less) complemented the RIAA curve.

As is, it may need a bit of tweaking to get the input sensitivity to match - search for 'resistive divider' on google... or use it 'as is' since it's easy enough to compensate by not bringing the mixer input control to 'full up'.

Cheers!
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Old 17th February 2006, 05:43 PM   #3
bobcat is offline bobcat  United Kingdom
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When i say high quality i mean sound quality and build it has loads of inputs cer/ mag /mm /mc line /aux /tape/ balmic/ un balmic/ echo /repeat/ store/ 10 band eq/selective taoe eq e.t.c but i need more line inputs so i will try feeding aknown signal and attenuate to gain the desired results.
Many thanks B/c
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Old 18th February 2006, 12:32 AM   #4
clem_o is offline clem_o  Philippines
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Hi bobcat,

If you keep it switched to 'mag' you can try this:

Inverse RIAA

The link shows you how to make a passive network to allow CD output (i.e. line out) to be plugged into phono inputs...

Cheers!

ps: this is in case your 'ceramic' input setting isn't totally flat - some designs put an extra load capacitance, some leave it out.
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