The Focus V2 is the only commercially available tES device that features tDCS (Direct Current), tACS (Alternating Current), tPCS (Pulsed Current) and tRNS (Random Noise) stimulation. Inside foc.us V2 is a 32Bit ARM® Microprocessor. Using advanced micro-electronics ensures accurate stimulation. Impedance changes can be detected and correct in 50 micro...
The Focus V2 is the only commercially available tES device that features tDCS (Direct Current), tACS (Alternating Current), tPCS (Pulsed Current) and tRNS (Random Noise) stimulation. Inside foc.us V2 is a 32Bit ARM® Microprocessor. Using advanced micro-electronics ensures accurate stimulation. Impedance changes can be detected and correct in 50 micro seconds. This means target current levels are super-accurate and super-stable. Only the best components were used in construction from such manufacturers as Texas Instruments, Seiko and Panasonic.
Focus V2 tES Device
Easy to Use
Getting started with foc.us is simple. The blue OLED digital display and 4-way joystick make light work of controlling your session. During stimulation you can see the exact session time remaining, the active current value in mA plus a real-time graph of the actual current.
Time is Important
It is important not to mis-use electrical stimulation through over or repeat usage. That is why the foc.us V2 includes a real time clock. It will warn you if you try to start a stimulation session too soon after your last session. It also times and limits each session to the maximum recommended length of 40 minutes. You can also use the timer to start your session up to 12 hours in the future. This is useful if you want a session to start when you are asleep. All session logs are stamped with the time they were started for your convenience.
Small But Powerful
foc.us was designed with the aim of being both small and powerful. V2 includes a 3 axis accelerometer. It provides raw data for X, Y and Z movements as well as slope detection, tap sensing, orientation recognition, g-force detection and inactivity sensing. This movement detection is used in the lucid dream program to stop stimulation when movement is detected. Weighing in at less than the battery found in some DIY stimulators yet generating an output 6x higher.
- The focus V2 implements recommended safety guidelines for transcranial stimulation
- CE certified to Medical Standard 60601:2.
- Over usage prevention system
- Current limiting circuitry and session audit logs
Included with every V2 is the foc.us dock. The dock connects to your computer via an included micro-USB cable. As well as recharging your v2 the dock serves as a Bluetooth Low Energy dongle. This allows the foc.us+ connect software to update your foc.us v2 via Bluetooth Low Energy without any additional hardware requirements.
Focus V2 Available Waveforms
tDCS - transcranial direct current stimulation
tDCS mode current can be set from 0.1 to 2.0 mA for session durations between 1 and 40 minutes. Voltage can be also be controlled from 10 V to 60 V. Actual current is logged every 50 ms for an accurate record of the session. Featuring current ramp up and ramp down to make session start and end as comfortable as possible.
tACS - transcranial alternating current stimulation
tACS mode current can be set from 0 to 2 mA for session durations of between 1 and 40 minutes. Frequency can be set between 0 and 300 Hz in both unipolar and bipolar modes. A current offset between 0 and the target current can also be specified.
tPCS - transcranial pulsed current stimulation
Set the duty cycle and frequencey for pulsed current stimulation sessions. You can set Sham to ON, and have no graph, or set sham to BLIND and the focus V2 will either show the real current graph or create a fake graph.
tRNS - transcranial random noise stimulation
Randomize the current, the frequency or both and set the range boundaries for each. tRNS is becoming increasingly popular in todays electrical brain stimulation studies.
- foc.us V2 tES Stimulator
- foc.us charging dock
- USB 2.0 to micro USB Cable
- Instruction booklet
*DOES NOT INCLUDE ELECTRODES
No Dock Connected Error
- Is the USB cable connected?
- Check you only have 1 instance of foc.us+ connect running, if you have more, only one will be able to access the COM port used by the dock
- Check you have the dock drivers installed
How to install foc.us+ connect
Do I need an app to control foc.us V2?
No. All functionality of the V2 is available via the joystick and oled display.
Current Regulation in foc.us V2
Probably the most important function of an electrical stimulator is ensuring that the target current level is correctly maintained. This is an explanation of how foc.us control the current output in the foc.us V2. There is a hardware current regulator which is controlled by the MCU. The MCU does not participate in current regulation, it just sets the target current value to the current regulator input. The hardware current regulator is very fast. It can change the output current from the minimum 0mA to the maximum 2mA in 300 µ seconds at full impedance load. At lower resistance levels it can do it even faster. The current of the high voltage source is hardware limited to 2.1 mA, which is fed to the hardware current regulator,.which as described above can quickly change the output current to the targeted value and thenthe final step is an independent hardware current limiter, configured to 2.1 mA between the hardware current regulator and the electrodes. In summary, the input to the hardware current regulator cannot exceed 2.1 mA, which is then shaped into the signal e.g. tdcs, trns, tpcs, tacs at the desired current level - which is limited to 2 mA, and then passed through a final limiter before the electrodes. This provides super fast, super safe signal generation. As part of the assembly process we test and verify that all three of these circuits are functioning correctly. We perform this test on every single device. 100% testing.
How to update the firmware on the foc.us V2 using foc.us+ connect
You should regularly update the firmware on your foc.us v2 to ensure you have all the latest features. This is how you do that using the foc.us+ connect app
How to install foc.us+ connect on OS X
Charging your foc.us V2
If you do not see the battery icon, then your device is not charging. Please ensure you have installed the foc.us+ connect app which will enable charging.