Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I see basically 2 possibilities, since I do not want to do the switching with the PIC.
1) Have a self-contained circuit that will do constant current based on the voltage presented. A voltage controlled current source. It has its own mechanism for responding to changing loads for any given...
How about this IC? tps61042. It can switch up to 30V. Not quiet as high, but I really only need up to 2mA as a definite. It has both analog and PWM input for brightness control (current control).
What do you think? will this work?
I would prefer to use an IC for the constant current generator. Something that accepts analog voltage or digital PWM as input, and outputs a constant current despite the load (within limits). I can then use a PIC to manage the current and display. I am a much better programmer than circuit...
If I just use a step-up converter, I'll also need to use a feedback voltage drop resistor to accurately control the current. I am not sure on the op-amp to use and the component values.
I am making a nerve stimulator. To depolarize a nerve, we need constant current. I can manage the pulse width with a PIC MCU. It will be used for nerve blocks. The load will be the needle in muscle, fat, nerve sheath..etc and the skin surface electrode.
Hi,
I am trying to design an accurate, stable constant current generator with currents 0.1 mA to 3-4mA. I am trying to do this with digital voltage control PWM. Ideally would have 8 bit to 10 bit resolution, or at least 0.1mA/per %duty cycle. Current load would be 600 ohms to 10 Kohms, so...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
