Vestax DCR-1500 mod/Improve
Photograph:Hassy@MetaDesignWork
(C)2017 Hassy All Right Reserved
"rebuild into short signal pass /extremely improve"

DC+/-18V Regulator
(extremely lo noise)









additional Fuse into Power Transformer module



I/O rebuild






Isolator rebuild

















someone defected circuit pattern
-reWork















Filter Out Phase Pos/Neg Select






Filter In<>Thru "XFader"
















InputInv_to_Filter_Out_50Hz_Phase / InputInv_to_Filter_Out_100Hz_Phase


InputInv_to_Filter_Out_1KHz_Phase


InputInv_to_Filter_Out_10KHz_Phase / InputInv_to_Filter_Out_20KHz_Phase


InputInv_to_Isolator_Out_50Hz_Phase / InputInv_to_Isolator_Out_100Hz_Phase


InputInv_to_Isolator_Out_1KHz_Phase


InputInv_to_Isolator_Out_10KHz_Phase / InputInv_to_Isolator_Out_20KHz_Phase


not yet gain corrected
Filter 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.8V Ch1Max=1.34V Ch1Min=-1.46V Ch2P-P=2.62V Ch2Max=1.35V Ch2Min=-1.27V
Filter 100Hz In/Out
Ch1P-P=2.78V Ch1Max=1.34V Ch1Min=-1.44V Ch2P-P=2.6V Ch2Max=1.34V Ch2Min=-1.26V
Filter 1KHz In/Out
Ch1P-P=2.67V Ch1Max=1.3V Ch1Min=-1.37V Ch2P-P=2.52V Ch2Max=1.29V Ch2Min=-1.23V
Filter 10KHz In/Out
Ch1P-P=2.73V Ch1Max=1.32V Ch1Min=-1.41V Ch2P-P=2.63V Ch2Max=1.34V Ch2Min=-1.29V
Filter 20KHz In/Out
Ch1P-P=2.54V Ch1Max=1.25V Ch1Min=-1.29V Ch2P-P=2.39V Ch2Max=1.21V Ch2Min=-1.18V
(almostly unity gain)
Isolator 50Hz In(ch1)/Out(ch2)
Ch1P-P=500mV Ch1Max=230mV Ch1Min=-270mV Ch2P-P=1.49V Ch2Max=770mV Ch2Min=-720mV
Isolator 100Hz In/Out
Ch1P-P=500mV Ch1Max=230mV Ch1Min=-270mV Ch2P-P=1.48V Ch2Max=760mV Ch2Min=-720mV
Isolator 1KHz In/Out
Ch1P-P=480mV Ch1Max=220mV Ch1Min=-260mV Ch2P-P=1.43V Ch2Max=720mV Ch2Min=-710mV
Isolator 10KHz In/Out
Ch1P-P=480mV Ch1Max=220mV Ch1Min=-260mV Ch2P-P=1.48V Ch2Max=740mV Ch2Min=-740mV
Isolator 20KHz In/Out
Ch1P-P=450mV Ch1Max=210mV Ch1Min=-240mV Ch2P-P=1.34V Ch2Max=680mV Ch2Min=-660mV
(almostly Max+10dB)
Input to XFader/Isolator Only Out 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.79V Ch1Max=1.35V Ch1Min=-1.44V Ch2P-P=1.49V Ch2Max=770mV Ch2Min=-720mV
Input to XFader/Isolator Only Out 100Hz In/Out
Ch1P-P=2.77V Ch1Max=1.34V Ch1Min=-1.43V Ch2P-P=1.49V Ch2Max=770mV Ch2Min=-720mV
Input to XFader/Isolator Only Out 1KHz In/Out
Ch1P-P=2.66V Ch1Max=1.3V Ch1Min=-1.36V Ch2P-P=1.45V Ch2Max=730mV Ch2Min=-720mV
Input to XFader/Isolator Only Out 10KHz In/Out
Ch1P-P=2.72V Ch1Max=1.32V Ch1Min=-1.4V Ch2P-P=1.5V Ch2Max=750mV Ch2Min=-750mV
Input to XFader/Isolator Only Out 20KHz In/Out
Ch1P-P=2.54V Ch1Max=1.24V Ch1Min=-1.3V Ch2P-P=1.35V Ch2Max=690mV Ch2Min=-660mV
(almostly -6dB &-10dB)
Input to XFader/Filter Pos Max to Isolator Out 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.78V Ch1Max=1.34V Ch1Min=-1.44V Ch2P-P=1.5V Ch2Max=770mV Ch2Min=-730mV
Input to XFader/Filter Pos Max to Isolator Out 100Hz In/Out
Ch1P-P=2.78V Ch1Max=1.34V Ch1Min=-1.44V Ch2P-P=1.5V Ch2Max=770mV Ch2Min=-730mV
Input to XFader/Filter Pos Max to Isolator Out 1KHz In/Out
Ch1P-P=2.66V Ch1Max=1.3V Ch1Min=-1.36V Ch2P-P=1.46V Ch2Max=740mV Ch2Min=-720mV
Input to XFader/Filter Pos Max to Isolator Out 10KHz In/Out
Ch1P-P=2.73V Ch1Max=1.32V Ch1Min=-1.41V Ch2P-P=1.59V Ch2Max=800mV Ch2Min=-790mV
Input to XFader/Filter Pos Max to Isolator Out 20KHz In/Out
Ch1P-P=2.54V Ch1Max=1.25V Ch1Min=-1.29V Ch2P-P=1.39V Ch2Max=710mV Ch2Min=-680mV
(almostly -6dB &-10dB)
Input to XFader/Filter Neg Max to Isolator Out 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.8V Ch1Max=1.36V Ch1Min=-1.44V Ch2P-P=1.51V Ch2Max=750mV Ch2Min=-760mV
Input to XFader/Filter Neg Max to Isolator Out 100Hz In/Out
Ch1P-P=2.79V Ch1Max=1.34V Ch1Min=-1.45V Ch2P-P= 1.5V Ch2Max=750mV Ch2Min=-750mV
Input to XFader/Filter Neg Max to Isolator Out 1KHz In/Out
Ch1P-P=2.66V Ch1Max=1.3V Ch1Min=-1.36V Ch2P-P=1.48V Ch2Max=750mV Ch2Min=-730mV
Input to XFader/Filter Neg Max to Isolator Out 10KHz In/Out
Ch1P-P=2.71V Ch1Max=1.31V Ch1Min=-1.4V Ch2P-P=1.58V Ch2Max=810mV Ch2Min=-770mV
Input to XFader/Filter Neg Max to Isolator Out 20KHz In/Out
Ch1P-P=2.53V Ch1Max=1.24V Ch1Min=-1.29V Ch2P-P=1.36V Ch2Max=690mV Ch2Min=-670mV
(almostly -6dB &-10dB)
Input to XFader/Filter Pos Half to Isolator Out 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.77V Ch1Max=1.34V Ch1Min=-1.43V Ch2P-P=2.75V Ch2Max=1.42V Ch2Min=-1.33V
Input to XFader/Filter Pos Half to Isolator Out 100Hz In/Out
Ch1P-P=2.78V Ch1Max=1.34V Ch1Min=-1.44V Ch2P-P=2.74V Ch2Max=1.4V Ch2Min=-1.34V
Input to XFader/Filter Pos Half to Isolator Out 1KHz In/Out
Ch1P-P=2.67V Ch1Max=1.3V Ch1Min=-1.37V Ch2P-P=2.66V Ch2Max=1.34V Ch2Min=-1.32V
Input to XFader/Filter Pos Half to Isolator Out 10KHz In/Out
Ch1P-P=2.73V Ch1Max=1.32V Ch1Min=-1.41V Ch2P-P=2.81V Ch2Max=1.41V Ch2Min=-1.4V
Input to XFader/Filter Pos Half to Isolator Out 20KHz In/Out
Ch1P-P=2.53V Ch1Max=1.24V Ch1Min=-1.29V Ch2P-P=2.43V Ch2Max=1.23V Ch2Min=-1.2V
(almostly Unity &-10dB)
Input to XFader/Filter Neg Half to Isolator Out 50Hz In(ch1)/Out(ch2)
Ch1P-P=2.8V Ch1Max=1.34V Ch1Min=-1.46V Ch2P-P=210mV Ch2Max=120mV Ch2Min=-90mV
Input to XFader/Filter Neg Half to Isolator Out 100Hz In/Out
Ch1P-P=2.78V Ch1Max=1.35V Ch1Min=-1.43V Ch2P-P=180mV Ch2Max=100mV Ch2Min=-80mV
Input to XFader/Filter Neg Half to Isolator Out 1KHz In/Out
Ch1P-P=2.67V Ch1Max=1.3V Ch1Min=-1.37V Ch2P-P=150mV Ch2Max=90mV Ch2Min=-60mV
Input to XFader/Filter Neg Half to Isolator Out 10KHz In/Out
Ch1P-P=2.72V Ch1Max=1.32V Ch1Min=-1.4V Ch2P-P=580mV Ch2Max=290mV Ch2Min=-290mV
Input to XFader/Filter Neg Half to Isolator Out 20KHz In/Out
Ch1P-P=2.52V Ch1Max=1.24V Ch1Min=-1.28V Ch2P-P=970mV Ch2Max=500mV Ch2Min=-470mV
(almostly -22dB to -8dB w/frequency & -10dB)
each gain of Filter/Isolator is correct ,
then Filter XFader loss -16dB should be corrected...then
Input to XFader/Isolator Only Out should be unity/Max+10dB
Input to XFader/Filter Pos Max to Isolator Out should be unity/Max+10dB
Input to XFader/Filter Neg Max to Isolator Out should be unity/Max+10dB
Input to XFader/Filter Pos Half to Isolator Out should be +6dB/Max+16dB
Input to XFader/Filter Neg Half to Isolator Out should be -16dB to -2dB/Max -6dB to +8dB
...gain corrected
Noise

AnalyzerNoise
Input -> Filter XFader (Filter In<>Thru & Pos/Neg Phase) -> Isolator -> Output

FilterThruMax_IsolatorLMH_Min / FilterThruMax_IsolatorLMH_Unity


FilterThruMax_IsolatorLMH_Max


FilterInMax_IsolatorLMH_Min / FilterInMax_IsolatorLMH_Unity


FilterInMax_IsolatorLMH_Max
(12.5KHz is environmental noise)


FilterInThruHalf_IsolatorLMH_Min / FilterInThruHalf_IsolatorLMH_Unity


FilterInThruHalf_IsolatorLMH_Max

Signal

Analyzer_Pink


FilterThruMax_IsolatorLMH_Unity-Pink / FilterThruMax_IsolatorLMH_Max-Pink


FilterThruMax_IsolatorMUnity_LHMin-Pink


FilterThruMax_IsolatorLUnity_MHMin-Pink / FilterThruMax_IsolatorHUnity_LMMin-Pink


FilterThruMax_IsolatorLHUnity_MMin-Pink


FilterThruMax_IsolatorLMUnity_HMin-Pink / FilterThruMax_IsolatorMHUnity_LMin-Pink


FilterThruMax_IsolatorLMax_MHUnity-Pink / FilterThruMax_IsolatorLMUnity_HMax-Pink


FilterThruMax_IsolatorLHMax_MUnity-Pink / FilterThruMax_IsolatorLHUnity_MMax-Pink


FilterThruMax_IsolatorLMMax_HUnity-Pink.jpg / FilterThruMax_IsolatorMHMax_LUnity-Pink


FilterInMax_IsolatorLMH_Unity_Filter_HPFCut_LPFOpen_PeakOff /
FilterInMax_IsolatorLMH_Unity_Filter_LPFCut_HPFOpen_PeakOff


FilterInMax_IsolatorLMH_Unity_Filter_HPFCut_LPFOpen_PeakMax /
FilterInMax_IsolatorLMH_Unity_Filter_LPFCut_HPFOpen_PeakMax


FilterInMax_IsolatorLMH_Unity_Filter_HPF1KHz_LPF1KHz_PeakOff /
FilterInMax_IsolatorLMH_Unity_Filter_HPF1KHz_LPF1KHz_PeakMax


FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPFHPF_Open_PeakOff


FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPFOPen_HPF_1KHz_PeakOff /
FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPF1KHz_HPF_Open_PeakOff


FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPFOpen_HPF_1KHz_PeakMax /
FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPF1KHz_HPF_Open_PeakMax


FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPFHPF_1KHz_PeakOff /
FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPFHPF_1KHz_PeakMax


FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPF400Hz_HPF_4KHz_Peakoff /
FilterInThruHalf_Pos_IsolatorLMH_Unity_Filter_LPF400Hz_HPF_4KHz_Peakmax


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFHPF_Open_PeakOff


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFOpen_HPF_Cut_PeakOff /
FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFCut_HPF_Open_PeakOff


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPF1KHz_HPF_Open_PeakOff /
FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFOpen_HPF_1KHz_PeakOff


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPF1KHz_HPF_Open_PeakMax /
FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFOpen_HPF_1KHz_PeakMax


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFHPF1KHz_PeakOff /
FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPFHPF1KHz_PeakMax


FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPF400Hz_HPF_4KHz_PeakOff /
FilterInThruHalf_Neg_IsolatorLMH_Unity_Filter_LPF400Hz_HPF_4KHz_PeakMax


Extremely Improved Custom
w/ L/M/H Max+10dB 3Way Isolator &
VCF In<>Thru XFader w/Pos<>Neg Mix
(1.5Hz to 150KHz -100dB to +24dB)


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(C)2000-2019 Hassy All Right Reserved
Meta Design Work