On Thu, 2012-01-26 at 08:40 +0200, Viesturs Lācis wrote: ... snip > Ground is shared on both sides, because 5V and 12V are supplied by PC's PSU. > Is there a simple way I can drive that transistor without optoisolator?
I think you could add a smaller transistor in place of the opto-isolator. See the attachment for rough schematic that would need work to make a practical circuit. An off-the-shelf solid state relay might do the job too. ... snip > it seems that with > all my struggle I am getting over the "diy will be cheaper" line and > it does not seem that I can easily get it working) > I like that point of distracting client's attitude :) > > Viesturs Many times I find it easier to make what I need, than to try and modify an existing product to fit what I need. Sometimes one needs isolation sometimes not. Sometimes one needs to convert a 12 Volt signal to 5 or 3 Volts, or RS232 to RS485 and an existing product just doesn't have the right combination of features. After some experience one gets used to what works them, but maybe not for anyone else. If a product has the proper features, my guess it will most often be cheaper overall to buy than to make, but for me, at this time, I either make it from what I have on hand, or it doesn't get done. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA
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