Yea, I think I'm just gonna have to live with it until I can find a deal on a better PS. I have watched several YouTube demos on similar supplies and what I've noticed is that the CC and CV LEDs seem to lock in very quickly with virtually no overlap. Like a SPDT switch. You can have either A or...
Ok I'm done for now... I've tried to explain this in common sense terms several times but you are not understanding the operation of the power supply for some reason. Nearly all power supplies have this exact same feature (CC & CV) limiting. A very useful feature, however mine doesn't work...
"....should NEVER be a CC condition unless the circuit or the PS has failed." I agree, it's just that adjusting the Current Dial down to get an idea of where the limit is set, throws the PS into this weird state. It's not proper behavior and causes dangerous output in my opinion. I can certainly...
When both LEDs are lit at the same time, it indicates a huge problem since the op-amp is not supposed to be able to be in both states at the same time. So I am assuming, as was suggested by ScottyUK, that the Op-Amp control circuit is probably bouncing or oscillating between on/off or +/- or...
I'm not intending to run this in both modes simultaneously, the power supply has a problem with the automatic CC & CV circuit. In normal operation, the Op-Amp somehow switches between the 2 when a limit is encountered. In general use, Voltage is Controlled so the CV LED is lit most of the time...
I suppose it's possible for the LEDs to be flickering back and forth, but if they are, it's still an indication that the CC or CV circuit is doing the same thing. The CC limiting is not doing it's job while this is happening. Raising the voltage dial allows the voltage and current to rise until...
"You should not run power supplies at both CC and CV limits."
That's my point exactly. But in dialing things in, invetiably I run into the point where the 2 controls overlap and the PS output freaks out, causing a potential disaster for delicate circuits. I'm determined to find a cure. It...
Thanks for your response. Yes it does have some good sized caps, couple of 1000uF and a couple 470uF. Actually there's an open spot on PCB to add a third 1000uF. I was thinking this might be a good idea, but after reading your reply maybe not. What about isolating, or separating the sensing...
Does anyone know why both CV and CC LED's are sometimes lit when using my power supply? Scope shows odd waveform whenever this happens. Otherwise, flat line DC, no waveform, everything fine. It usually happens when current limiting knob is just starting to have an effect. Seems like the...
