Cheers Bubo, I was thinking the same thing. If it fits, the unused pin could be clipped short or just covered with heatshrink tubing. With a bit of doing, the leads for the caps and resistor (maybe the pot too) could be stuck in the back of the connector between the plastic and crimp ons. The pot I'd probably want mounted elsewhere though.
EverCool Variable Voltage Mod
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That connector "looks" like the same spacing as what I used... To me it looks like the centers are about 2.5 mm apart. The chip has pins that are 1.7 pin to pin on center.
All of those will work just like the DIP one I used, but if we want to not bend the pins at all...the holes need to be closer.
That little 3 hole and 2 hole one in my picture in the above post is 1.7mm. I just wish I know where I got it.
The IDE drive cable is also the same as the the DIP spacing.
Trust me - check back in a few minutes,,and you'll think differently - I am working on rest of it now.. (That's why I posted pretty pics first!)
I have solder everywhere...
I have solder everywhere...
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Okay - here is the evening's progression..
Looks pretty huh?
Too bad it doesn't work... $^%@*!!
Time for the evening's libations....
Looks pretty huh?
Too bad it doesn't work... $^%@*!!
Time for the evening's libations....
It's alive! Alive, I tell you alive! BWAH HA HA!!!!!
Where are those damn dancing bananas?!?!?
Problem turned out to be the same one I have had before, the positive contacts on the battery box suck and don't make consistent contact; beat the snot out of them to make a bigger dimple, and power flows...
BigBlue30 - you ROCK!
Where are those damn dancing bananas?!?!?
Problem turned out to be the same one I have had before, the positive contacts on the battery box suck and don't make consistent contact; beat the snot out of them to make a bigger dimple, and power flows...
BigBlue30 - you ROCK!
Toooooooooooooooooooooooooo cool. I am so glad you got it working. You do very nice work. You should be proud.
What if you don't want to put a potentiometer and just do a slide switch like the fist pack what changes will I need to do/where will I need to wire it in order to achieve this or is it not applicable to this setup.
What fixed voltage do you want? easy enough to just use a fixed switcher instead of adjustable. Another way is to play with it on the bench until you find a voltage you like then measure the pot and find a resistor to match, then replace the pot with the resistor.
Below is the resistance to voltage chart from page 8 if the TI spec sheet:
http://focus.ti.com/lit/ds/symlink/ptr08100w.pdf
The number on the left it the output voltage and after the "-" is the resistor you would need..ie for .6 volts out you would use a 131k resistor, For 5.5 you would use a .241k or 241 ohms.
As you can see most is the output voltages would not use a "off the shelf value", but you could pick one that is close.
If you wanted to do it with a switch and a set of resistors you would connect them to pin 5 (Vo adjust) and pin 3 (ground).
VO Req'd RSET (kΩ) VO Req'd RSET(kΩ) VO Req'd RSET(kΩ)
(V) (V) (V)
0.6- 131 2.3- 0.692 4.0- 0.347
0.7- 10.8 2.4- 0.653 4.1- 0.337
0.8- 5.66 2.5- 0.619 4.2- 0.328
0.9- 3.83 2.6- 0.588 4.3 -0.319
1.0- 2.89 2.7- 0.560 4.4- 0.310
1.1- 2.32 2.8- 0.535 4.5- 0.302
1.2- 1.94 2.9- 0.512 4.6- 0.295
1.3- 1.67 3.0- 0.491 4.7- 0.288
1.4- 1.46 3.1- 0.471 4.8 -0.281
1.5- 1.30 3.2- 0.453 4.9- 0.274
1.6- 1.17 3.3- 0.436 5.0- 0.268
1.7- 1.07 3.4- 0.421 5.1- 0.262
1.8- 0.978 3.5- 0.406 5.2 -0.256
1.9- 0.903 3.6- 0.393 5.3 -0.251
2.0- 0.839 3.7- 0.380 5.4- 0.246
2.1- 0.783 3.8- 0.368 5.5- 0.241
2.2- 0.735 3.9- 0.357
Am I correct to assume that if I wanted to achieve 4.5V I should get 2.32K resistor like this one
For 4.5 from the chart (I know it is hard to read, The copy did not come out very good) you would use.. 4.5- 0.302. That is a 302 OHM resistor.
anybody else try using this chip? any luck. PTR08100W from Texas Instruments? Thanks
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Yep... look a bit higher on this page...
Seems to be working just fine, although I should probably make one of those LED adapters to see what the voltage is that I am putting out - apparently one complete revolution on the POT changes the voltage by .01 so there are quite a few spins every time I fiddle with it....
Seems to be working just fine, although I should probably make one of those LED adapters to see what the voltage is that I am putting out - apparently one complete revolution on the POT changes the voltage by .01 so there are quite a few spins every time I fiddle with it....
Yep... look a bit higher on this page...
Seems to be working just fine, although I should probably make one of those LED adapters to see what the voltage is that I am putting out - apparently one complete revolution on the POT changes the voltage by .01 so there are quite a few spins every time I fiddle with it....
The meter is simple after making the evercool, the only problem is finding the meter now. Once I posted the meter, I think the mod'ers on ECF bought every one in the world.
I only have about 8 meters left and was told that this meter was being replaced by a better and BIGGER one.
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