How can we design an electronic circuit for TDCS with a current source for I=0-2mA?

Why do not all materials become superconductors when they cooled, while some materials show negligible resistance to current when they cooled below a temperature known as critical temperature?

Even there are some materials that are defect-free but do not shows superconductivity at low temperatures.

Which solvent can I use? I'm trying to dissolve PLA in chloroform, but I am getting some problems, can I use dichlomethane?

tDCS = Transcranial direct current stimulation

Thermal management of electronics/PCB boards purely depends on the power it dissipates (component power dissipations). But the power dissipation values provided by the component suppliers are the maximum power dissipation and in realty on field the power dissipation is far from this max values. So, i am looking into other possible ways to determine this values, through physic or analytically maybe.

Any bit of information would be highly helpful !

Thanking in advance !!!

Regards,

Rajesh.

Oscillators with very stable frequencies are required for communications and instrumentation as well as other electronic systems. Which are the factors limiting the stability of the oscillators and how can we build highly stable frequency oscillators?

I am currently testing for my undergraduate dissertation looking at TDCS . I was wondering if what was done/thought/spoken about during the stimulation would change the effect of the TDCS at all?

The size of transistor(length and width).

Hello Dear colleagues

in the figure below there are two relaxation oscillator circuits they do the some function that generate triangular and signals. However, what are the technical difference between these circuits? and in particular when i use the circuit in figure (a) and when i use circuits in figure (b)?

Best regards