ToyX project EQ Linearizer study case4

Finish each band circuit by jump wire.

Finish EQ power circuit and do placement estimate.


Test two bands EQ function together (by cascade).


Feed SG signal in band 4 for function test.


Measure output signal form band 5 and estimate circuit where need modify for meet design.


Band 4 top view.


Today receive EQ box order from two month ago.
This is front view with ten volume knobs. Each channel with five knobs to control EQ.


Inner picture.



Rear picture.

Toy11 VT4C 211AMP -1

Start to prepare the component and box.


Estimate the placement for good signal and easy hand make.



Estimate placement picture.

ToyX project EQ Linearizer study case3

Tuning each inductor value for meet LC band pass filter.


Finish each band pass  structure.


Test each band the frequency of drift .


Side view picture.

Estimate EQ  Linearizer outline and prepare drawing  of  EQ case.

Turntable test machine

All testing utility

VCO arm of pick up.

Detect pin1 & rotate VCO.

VCO RF test head.

VCO arm pick off.

Put  VCO in tub of  roller.

Detect sensor.

VCO test handle.

ToyX project EQ Linearizer study case2

Placement Band pass filter.


Solder capacitor of band pass filter.


Estimate placement.

EQ Linearizer  will be mono mono stack by two layer.

Recall1 DVB-T diy

DVB-T platform build in Cheertek main chip with transcoder and could receive DVB-T tuner signal then transfer into Video,Audio signal same time.
DVB-T got remote control ability through UR interface.


Platform rear view.



RF tuner zoom in picture.
DVB-T tuner use Quantel receiver and Afa9003 transcoder.

Diy8 DAB receivre

DAB tuner Hitachi receiver & SAW build in  support VHF Band-III & L-Band (1.5GHz)

Baseband Ti32C5416 DSP with bus bridge connect USB controller.
Could play DAB audio and send DLS（Dynamic Label Segments）through USB same time.

DAB tuner mount on baseband platform.
DAB box inner connection with power module and audio connector.
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