Topic: Howto: simple Differential Amp + TTL ?

[Xer0]

Mhh i hope it will. i soldered almost anything on the board already, now its one of the last things that have to be connected. if i can switch, i just to straight from the legs of the 100ohm resistors to the socket header. otherwsie, i have so put a wirte around or between the legs. not that difficult, but uncomfortable ^^

// mh and i have to get 2 quadjumpers too. to switch x and y when needed

[James]

If you have a correction amp that works in one phase, then flipping the phase of a wave, or individual channels within it, is possible in LaserBoy.

There is a lot of neat stuff to learn about all of this by using the LaserBoy application.

James. 

[meandean]

  If your projector inputs are really differential, (you can verify this by taking an ohmmeter between the '-' inputs to
make sure they are not tied together, and that looks like the case from the specs you posted), than you can wire however
you want.

[Xer0]

Mhh strange. is'nt working still. Singals are right, connectors are right. But ist dont lase. Only when i plugged the Plug half in it startet to make a picture. but as soon as i put hte plug more in it stops. some kind of Short somewhere... and the Blankin ist wrong again. maybe i should stick with the "Out to +" connection i had on the Breadboard

[meandean]

  Sorry to hear that you are having so many problems (that's electronics!). I've been burnt a few times by male/female connectors that just didn't mate well (like trying to get pandas to breed). Keep at it, as we all want to know what that cheap projector can do.

[James]

Please try the circuit that Dean designed, and I modified and suggested to you before.

You should have all the parts.

That would be a lot easier to help you with.

That is what I build for people and there are hundreds of variation on that circuit working for people all over the world.

James. 

[Xer0]

Hi. mhh i have lots o stuff to do for college now, but when i get time i will resolder the color outs to the positive ilda pins like it was bevore. that should fix it. all other stuff like x/y (with inverting jumpers, ftw!) and interlock port (can just jump it or connect a looongcat cable with a switch to it) is working like a charm.
besides: why noone ever used a Max232 to make +-10V from 5? its a fully integrated circuit and much cheaper than any dcdc stuff