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Quad FM4 tuner mamual mod
Quad FM4 tuner mamual mod
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Old 12th February 2013, 09:10 PM   #1
bigsparks is offline bigsparks
diyAudio Member
Join Date: Nov 2011
Default Quad FM4 tuner mamual mod

This mod came about becuase could not get the 4 bit cpu MP4480 or the TMS1000
so made it a manual tuning ,up to now after a day no drifting, so removed the IC1 and pin 12 link to REF h just above the IC1 this puts a high on the enable IC6 allowing knob voltage to tune the variacs , ,, attached the drawing
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File Type: pdf hfe_quad_fm4_schematic_11000_on.pdf (173.8 KB, 109 views)
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Old 13th February 2013, 07:44 AM   #2
405man is offline 405man  Scotland
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Join Date: Dec 2003
Location: South Lanarkshire near Glasgow Scotland
I understand that a replacement CPU with increased functionality giving more presets, 2 per button is now available from Quad

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