Copper Mod - New Twist

[squirrel64]

This will keep it from oxidizing... NON TOXIC also Keep Your WeatherVane New or Restore Your Old WeatherVane to Look New Again.

I only know it works good from a friend using it but not sure it would be good for this application... Just a thought

 

[Java_Az]

3.5v to 8.65 (fully charged)

I think what they are trying to figure out is how your getting 8.65 volts out of a ptr08100 chip when they are designed for a out put of .06 to 5.5 volts. With your 200 ohm pot dialed to 0 ohms you should be getting 5.5 volts not 8.65.

 

[roadrash]

Roadrash, not sure what you are saying? Can you elaborate?

what Java says.

I think what they are trying to figure out is how your getting 8.65 volts out of a ptr08100 chip when they are designed for a out put of .06 to 5.5 volts. With your 200 ohm pot dialed to 0 ohms you should be getting 5.5 volts not 8.65.

:>)

 

[breaktru]

You were right roadrash, it was the ground. When I had the components laid out on my bench, I had the top cap off which was what I needed to complete the ground for the circuit board. Now with the 220 fixed resistor and the 200 ohm pot, I get 3.6 volt to 6.1 volts. Unfortunately I broke the 3a CK push button switch after threading it into the pipe for the 3rd time trying to get the parts aligned better. Dam, paid 6.49 at MV. Bought the same for my first mod at Digi-key for $5

Update:
Searched thru my pile of old computer parts and found several push-buttons. I found an exact replacement for the broken CK switch at 3 amps at 12 volts.
Okay mod completed and I am set at 4.23volts with a 2.8 ohm atty I found.
I got to say, it's a bit long at 6".

 

[WillyB]

Glad you got it close to spec. But seeing as even 220Ω may be bit low, I don't think I'd use one that actually measures only 190Ω (off by 15%).

If you are planning more projects you can get a lot of various values (5% tolerances) here at a good price.

All Electronics | Electronic and Electro-Mechanical Parts and Supplies at Discount Prices

 

[breaktru]

Glad you got it close to spec. But seeing as even 220Ω may be bit low, I don't think I'd use one that actually measures only 190Ω (off by 15%).

If you are planning more projects you can get a lot of various values (5% tolerances) here at a good price.

All Electronics | Electronic and Electro-Mechanical Parts and Supplies at Discount Prices

Thanks WillyB. I bookmarked the page. Good resource to have. Well leave it to the master to come up with good parts sites and your fantastic tips and help.
Thank you WillyB, you've been a great help.
Got to say that the range of 3.6v to 6.1v seems pretty good. And at 6" long this would be handy to carry around for self defense. LOL.

 

[roadrash]

You were right roadrash, it was the ground. When I had the components laid out on my bench, I had the top cap off which was what I needed to complete the ground for the circuit board. Now with the 220 fixed resistor and the 200 ohm pot, I get 3.6 volt to 6.1 volts. Unfortunately I broke the 3a CK push button switch after threading it into the pipe for the 3rd time trying to get the parts aligned better. Dam, paid 6.49 at MV. Bought the same for my first mod at Digi-key for $5

Update:
Searched thru my pile of old computer parts and found several push-buttons. I found an exact replacement for the broken CK switch at 3 amps at 12 volts.
Okay Mod completed and I am set at 4.23volts with a 2.8 ohm atty I found.
I got to say, it's a bit long at 6".

oK, Jumping in again with both feet.
with the Vr set to zero, you should not get more than 5.5 volts:The default.confused:
No big deal if its working, Less than a volt.
Also, My Shlong 3/4 pipe mod is 15 " long with every thing attached.:>)

 

[WillyB]

oK, Jumping in again with both feet.
with the Vr set to zero, you should not get more than 5.5 volts:The default.confused:

I don't think that's the case, or they just would have presented it like the booster, which has voltage values listed but for the default 5V says 'open'.

 

[breaktru]

I don't think that's the case, or they just would have presented it like the booster, which has voltage values listed but for the default 5V says 'open'.

The resistance is lower than the 241 ohms for 5.5 v at 190 ohms, hence the 6.1v reading.

See BigBlues EverCool Varible Voltage quote:

EverCool Variable Voltage Mod

Some people will not like this chip because the max voltage is only 5.5 volts (6 volts if you go outside of the specs). That is OK with me because my sweet spot is 4.3 volts. Its efficiency is up to 96%, so my battery will last longer.

 

[roadrash]

I don't think that's the case, or they just would have presented it like the booster, which has voltage values listed but for the default 5V says 'open'.

Willy, you have a point. but from what I gather you should not be able to get more than 5.5 volts from this unit no matter whot.

sure would be nice if we could tear the ever cool expert away from his **** TO HELP WITH THIS.:>)

 

[roadrash]

The resistance is lower than the 241 ohms for 5.5 v at 190 ohms, hence the 6.1v reading.

See BigBlues EverCool Varible Voltage quote:

EverCool Variable Voltage Mod

Some people will not like this chip because the max voltage is only 5.5 volts (6 volts if you go outside of the specs). That is OK with me because my sweet spot is 4.3 volts. Its efficiency is up to 96%, so my battery will last longer.

Ah ha, we learn from the master and the student. Well done breaktru. :>)

 

[WillyB]

The resistance is lower than the 241 ohms for 5.5 v at 190 ohms, hence the 6.1v reading.

Some people will not like this chip because the max voltage is only 5.5 volts (6 volts if you go outside of the specs). That is OK with me because my sweet spot is 4.3 volts. Its efficiency is up to 96%, so my battery will last longer.

I understand, that was my point, and it may not make a lick of difference, but as I noted the datasheet says 5.5V max.

It was also reiterated by biggie.

the max voltage is only 5.5 volts (6 volts if you go outside of the specs).

Will operating it outside of it's specification make any difference? Probably not as TI builds robust chips that are probably conservatively rated. And seeing as our use is intermittent anyway it's probably a non-issue.

You should not construe any of this as a knock, it's just a discussion between modders, oh yea and roadrash.

 

[breaktru]

Cut down end caps. From left to right: 7.4v VV mod - 3.7v mod - original end cap.

 

[Rockproof]

Jumping into this thread. Very nice on the VV. I gotta build one.

 

[breaktru]

Jumping into this thread. Very nice on the VV. I gotta build one.

Hey Rockproof, I'm hoping to take apart the V.V. and take some photos today. The parts are really crammed in there. Last time I took it apart a broke the switch that I had threaded into the tube. With the replacement switch I used the nut to install it. Not as nice looking as one that was threaded and flush mounted.

 

[Rockproof]

Sweet breaktru. Thanks.

 

[breaktru]

Hey Rockport, see the V.V. copper mod at:Variable Voltage Evercool Copper Mod

 

[Rockproof]

You da man breaktru. Thanks a mil.