tonydizzle
- Oct 13, 2019
- 8
- Joined
- Oct 13, 2019
- Messages
- 8
Hello everyone!
I have what I feel has to be a simple question, but I just can't seem to work it out !!
I have the following 90w 19v adapter, that I would like to convert to output 5v (at an increased amperage of course)
I am assuming that, it being chinese and all, that I will be lucky to get 75W actual and the rest will be lost as heat, which is ok. That leaves the amp rating at 75/5=15a. That'll do.
I think I might even be able to get away with more at it's only going to be pushing that current for 10-20 seconds at a time, on an on-off basis. Between this and the load, the circuit will be controlled by a mosfetted hold-down switch, so it will default to off.
However.
But I can't find the IC in this circuit. I also can't identify which resistor is responsible for this, and I have reached the point where don't know what I am doing.
Is there any chance someone can spare a couple minutes to help me out?
Here are some photos I took: imgur/a/UXr0KMC
you'll see some damage to the tracing on the left - I will just have to solder that across I think, so that should be ok. I'll do it when I work out what else I'll need to repeal and replace.
Thanks
I have what I feel has to be a simple question, but I just can't seem to work it out !!
I have the following 90w 19v adapter, that I would like to convert to output 5v (at an increased amperage of course)
I am assuming that, it being chinese and all, that I will be lucky to get 75W actual and the rest will be lost as heat, which is ok. That leaves the amp rating at 75/5=15a. That'll do.
I think I might even be able to get away with more at it's only going to be pushing that current for 10-20 seconds at a time, on an on-off basis. Between this and the load, the circuit will be controlled by a mosfetted hold-down switch, so it will default to off.
However.
But I can't find the IC in this circuit. I also can't identify which resistor is responsible for this, and I have reached the point where don't know what I am doing.
Is there any chance someone can spare a couple minutes to help me out?
Here are some photos I took: imgur/a/UXr0KMC
you'll see some damage to the tracing on the left - I will just have to solder that across I think, so that should be ok. I'll do it when I work out what else I'll need to repeal and replace.
Thanks
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