arduino open source x pid power suply

[stefanosdimos]

hallo !!
i ordered 2 h bridges sugested by sirnoname (thanks a lot) .
is there a chance that i loose power from transistors or something in there ? ,i m thinking maybe i ll buy a power suply that is 13-14 volts ,or the best is 12 volts ? 1 power suplier with lots of amperes is it ok or better 2 pieces ,1 for each wiper motor ?

thank you

[ferslash]

i use a pc power source, in some countries they are cheaper, you just have to short circuit two wires, if you buy this option, you have to be sure that the power source can deliver the amount of amperage you need, this can be read in the label of the power source, it says "12 v at 25 amps" (someone here told me that if you are using wipers, with 25 amps is enough per motor, so you will need two power sources, one per motor)

best regard

[motiondave]

PC power supplies can be cheaper here in australia as well.
The point discussed is that a car battery in parallel is an effective way to provide more current and act as a buffer when spikes go back from motors changing direction.
Ive used pc power supplies re-wired in the past as well. I have found depending on how much you can pay for the power supply as well, actually depends on its true output.
A cheap power supply might say 12v at 25 amps, but it may only deliver 18 amps at 12v.
Hence using a second hand battery from a car.
Depending on what you can afford, always have MORE power than you need available. The motors only draw what they need.
If a pc power supply and a car battery is a cheaper setup, use it. I do on one of my simulators. Well, actually a benchtop 32 amp max 13.8v and a car battery, rated at 330CCA.
But on a past wiper sim I had a 18 amp pc power supply and car battery in parallel, never missed a beat.
Also, though, I have 2 x 40 amp power supplies on the other sim. One power supply per motor. Motors are only drawing about 25 amps or so each, (profiles are wound down and not harsh), but once again, more power than needed.
Both work fine.

[stefanosdimos]

thanks a lot guys