Topic: jb3 external power II...

[F.O.Bean]

 

Brian Skalinder, edit:  Original thread.

[Chris K]

is this a "made ya look" type post? 

[F.O.Bean]

hehe, kinda

i figured if anyone had any newer info, that it could be posted here

i am all about powering the jb3 ala rc batts, so i will prolly have some new info for us

[jdawg]

Here's web page I found on 5V power supplies, there are a bunch out there, but this one made it real easy to assemble.
http://www.play-hookey.com/analog/experiments/plus_5_volt_ps.html

Check out the circuit assembly tool near the bottom of the page.

Here's a picture of mine I built last night (few extra wires in there, but the main circuit is on the left side). Fun experiment anyway. Not sure if I'll actually take the plunge and solder to an IC board. But that would be a fun little project. Ran a few tests and everything seemed to work great. I didn't run an all night test or anything, the longest I ran it was for 1:30hr. But everything was cool and nothing was smoking on the board



-john

[leegeddy]

Here's web page I found on 5V power supplies, there are a bunch out there, but this one made it real easy to assemble.
http://www.play-hookey.com/analog/experiments/plus_5_volt_ps.html

Check out the circuit assembly tool near the bottom of the page.

Here's a picture of mine I built last night (few extra wires in there, but the main circuit is on the left side). Fun experiment anyway. Not sure if I'll actually take the plunge and solder to an IC board. But that would be a fun little project. Ran a few tests and everything seemed to work great. I didn't run an all night test or anything, the longest I ran it was for 1:30hr. But everything was cool and nothing was smoking on the board



-john

with a v. regulator like the 7805, you gotta take into account the amount of current the jb3 will need, thus heat dissipation when fed by a 12v or 9.6v source. 
i'm gonna pick up a jb3 from Ebay and see what kind of runtime it will have with a VR in place.  also, the physical size of the circuit, durablility in the field and workmanship are on the high priority list as well.

marc

[mmmatt]

This thread will help some with running multiple devices (inc a jb3) off of multiple batts.
http://www.taperssection.com/yabbse/index.php?topic=29217.0

Matt

[leegeddy]

got some voltage output data for the regulator circuit i'm working on.

input: 24v (actual 21.91v)
output: 5.20v

input: 12v (actual 11.17v)
output: 5.20v

input: 9.6v (actual 9.3v)
output: 5.21v

input: 7.2v (actual 7.15v)
output: 5.20

input: 6v (actual 5.34)
output: 3.97v

the circuit is very compact and basically can be placed inline in a small hobby box with xlr panel mounts, if necessary.

the regulator IC can handle 1.5A of current so that should be more than ample.

now, who wants to send me their jb3 for testing? 

marc

[Simp-Dawg]

marc, i have 2 jb3's, i could loan you one for a little bit if you need...

[jdawg]

Marc,

Can share the circuit design? Especially the 9.6v input version. Been having some issues with outputing 5.00v's,  so I'm thinking maybe 5.21 may do the trick.

thanks

[leegeddy]

Marc,

Can share the circuit design? Especially the 9.6v input version. Been having some issues with outputing 5.00v's,  so I'm thinking maybe 5.21 may do the trick.

thanks

it's similar to this based on the LM317T



governing equation is: Vout=1.25(1+R2/R1). R1 is fixed. so, various Vout can be achieved by adjusting R2. as long as the Vin > 2.5v over Vout, this VR circuit will work fine in our application and is very compact.

marc

[jdawg]

much appreciated!  And I just made it before rat shack closed!

[fozzy]

Would you mind running a test with 7.2 volts as the input source.

Thanks

[leegeddy]

Would you mind running a test with 7.2 volts as the input source.

Thanks

sure. see above.

as you can see, the regulated voltage is stable across the Vin values EXCEPT for the 6v. there isn't enough of a V differential.

marc

[fozzy]

Would you mind running a test with 7.2 volts as the input source.

Thanks

sure. see above.

as you can see, the regulated voltage is stable across the Vin values EXCEPT for the 6v. there isn't enough of a V differential.

marc

+t thanks for the update.  If this works w/ a JB3 i can ditch my lead and hook into my UA5 powering solution

[leegeddy]

Would you mind running a test with 7.2 volts as the input source.

Thanks

sure. see above.

as you can see, the regulated voltage is stable across the Vin values EXCEPT for the 6v. there isn't enough of a V differential.

marc

+t thanks for the update.  If this works w/ a JB3 i can ditch my lead and hook into my UA5 powering solution

i ran my sony cd walkman (takes 4.5v) with the vr circuit and it worked fine. hopefully, i'll test out the jb3 soon.

marc