Ive had this 30V 3A regulated power supply for quite some time. It can either be a voltage source or current source. When its being used as a voltage source theres a green led, and when its current, its a red led.
I've come across behaviour which I have not seen and am just looking for some insight.
I recently built a circuit with a GLCD + PIC on a breadboard. I set the power supply to 5V. However, when I turned it on, the green led disappeared and the red led came on (telling me current source...ie. voltage shorted). I checked the connections, and everything checks out ok.
The circuit works even though I'm not measuring any noticable voltage. So I started to adjust the voltage knob slowly and voila, green led came back on (voltage source). I measured the voltage and it was hovering at about 4.1V. However, if I go higher than that, it seems I go into current source.
I've tried to look for documentation on my power supply but its pretty old (analog meter).
Any ideas why when I increase voltage, my source goes from voltage to current ?
Aren't pics voltage devices ? I have no voltage, yet my circuit works ?
Could it be that I'm trying to draw to much ? I can set the limit of my current source, to whatever I want, and if I increase my current value, I don't get this problem. But my display goes SUPER bright like when you are about to fry an LED bright.
I've come across behaviour which I have not seen and am just looking for some insight.
I recently built a circuit with a GLCD + PIC on a breadboard. I set the power supply to 5V. However, when I turned it on, the green led disappeared and the red led came on (telling me current source...ie. voltage shorted). I checked the connections, and everything checks out ok.
The circuit works even though I'm not measuring any noticable voltage. So I started to adjust the voltage knob slowly and voila, green led came back on (voltage source). I measured the voltage and it was hovering at about 4.1V. However, if I go higher than that, it seems I go into current source.
I've tried to look for documentation on my power supply but its pretty old (analog meter).
Any ideas why when I increase voltage, my source goes from voltage to current ?
Aren't pics voltage devices ? I have no voltage, yet my circuit works ?
Could it be that I'm trying to draw to much ? I can set the limit of my current source, to whatever I want, and if I increase my current value, I don't get this problem. But my display goes SUPER bright like when you are about to fry an LED bright.