What I am looking for here is how to alter the feed back circuit’s to make them variable power supplies, there are so many different chips in so many different ATX supplies. How do I find the feed back pin with out googling the chip number on any unknown brand of chip?😕😕
Meanwhile, more ic information is here.
Meanwhile, more ic information is here.
That is risky as changing the feedback may upset stability. The better way is to vary the reference voltage for the regulator.
BTW Why did you pollute the forum with the same thread three times??
Jan
BTW Why did you pollute the forum with the same thread three times??
Jan
Sorry, this situation will happen because I have not found the previous topic because of the lag of the network.
Maybe your ISP is slow to update his caches? However, at 4am there would not be much traffic so no excuses.
Usually the feedback path is layout-critical to avoid picking up noise, a workable approach might be to design in a small digipot into the PCB from scratch. Trying to camp-on to an existing circuit with external circuitry in the feedback path could have issues (try it, but don't be too surprised if it fails...)
As mentioned above any decoupled reference signal is amenable to being provided remotely. The base of a resistive divider could be turned into a reference for instance, if well decoupled right at the chip.
As mentioned above any decoupled reference signal is amenable to being provided remotely. The base of a resistive divider could be turned into a reference for instance, if well decoupled right at the chip.
Actually my location is in China, the 4am is our working time(2pm). But I also need to apologize for it.
So do you have any views about my question?🙂
I find a Scouse accent to be less charming than a Geordie one but both come with a wicked sense of humour. It would seem that you are neither.
No you will not convert an ATX supply to a variable supply.
No you will not convert an ATX supply to a variable supply.
Depending what you need this for, you could use a buck regulator on the output to give a variable supply.
Plenty of cheap boards on ebay.
With or without built-in LCD display.
Plenty of cheap boards on ebay.
With or without built-in LCD display.
New member, 3 posts. Still under Moderation. So his posts do not go "live" until a human moderator has the free time to go through the moderation chore-list. An impatient new poster can post a flood of messages and not understand why they don't appear "instantly".