Friday , December 15 2017
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Device Comparison

Device:  Apex type A 9V

Feature
Power source 9v battery
Max Voltage 7v
Current range Limited to 2mA
Circuit type 3 terminal adjustable current source IC, 10mA 40V
Max load 3.5KΩ (in 2 mA)
Calibration Device is well calibrated, output is 0.16mA more than what A meter shows
Control Knob control is not linear
Output connector Banana connector (2 x pair)
Dimension 16×9.5×7.5 cm
Weight ~13 ounces
Enclosure Plastic
Other The device is bulky and heavy.
It is easily possible to use 2 batteries in series to increase the max load to 8.3KΩ
The device should be opened for battery replacement, but the screw is not suitable for this purpose.

 

Circuit: Simple configuration of LM334z

Bill of Material:  LM334z, analog ammeter, 2 resistors, LED, volume 500Ω pot

 

Device:  SSD 12-24

Feature
Power source 2 x 12v batteries
Max Voltage 10.89v @12v , 23.61v @24v
Current range Limited to 2.27mA
Circuit type 3 terminal adjustable current source IC, 10mA 40V
Max load 4.8KΩ @12v , 10.4KΩ @24v (in 2mA)
Calibration Device is well calibrated, output is 0.16mA more than what A meter shows
Control Knob control is not linear
Output connector Small 3mm connector (what is the name of connector?)
Dimension 7.5×13.5x7cm
Weight ~8 ounces
Body Plastic box with a coating and the lid is 3D printed with white material
Other The batteries are not common. There is a switch to select 12v or 24v. It is possible to remove this switch. Ampere meter can shows up to 5mA.

 

Bill of Material: 2 x LM334z, analog A meter, 4 R, LED, volume 100kΩ , 2 x 12v battery, double sided PCB, switch, diode

 

Device: The BrainStimulator tDCS Travel Model V 1.2

Feature
Power source 9v battery
Max Voltage 8.90v
Current range 1mA, 2mA
Circuit type 3 terminal adjustable current source IC, 10mA 40V
Max load 4.5KΩ (in 2 mA)
Calibration Without feedback
Interface Switch : off, 1mA,  2Ma
Output connector 3.5mm Mono Audio Jack
Dimension 8x4x2 cm
Weight ~5 ounces
Body Plastic with printed plastic sticker
Other Device is light and compact. The screws are not designed for multiple opening/closing of the device to replace battery.


Circuit:  
Simple configuration of LM334z

Bill of Material:  LM334z, 2 res, switch, audio jack, 2 sided PCB

 

Device: Go Flow Pro, Focus, V5, PCB 3

Feature
Power source 9v battery
Max Voltage 24V (it uses inductors to increase the applied voltage)
Current range 0.5, 0.65, 0.75, 0.87, 1, 1.12, 1.25, 1.37, 1.5, 1.67, 1.75, 1.87, 2  mA
Circuit type Microcontroller
Max load 10.38KΩ (in 2 mA)
Calibration Well
Interface Switch with up and down and enter commands

2 x 7 LEDs (orange and green) orange can be controlled with 2 intensities

Output connector 2.5mm Audio Jack with 4 connections
Dimension 2.5×2.5×1.5 cm
Weight ~ 3 ounces
Body molded plastic
Other The cable heads are magnet

Circuit: very compact and well designed circuit

Bill of Material: Microcontroller, 2 x inductors, capacitors, resistors, 7 x 2 LEDs, 3 x 5 pin chips, 3 Transistors, 2 sided PCB, assembled by machine