7.5.17:
mobi`office/xpw`power
todo
7.4.13:
todo.web/mobi`electric/electronics not stackable due to
amperage limits ?
. look at all the links the physics forum to know them;
then ask about idea of avoiding dc conversion by adding loads:
(
electronics not stackable due to amperage limits ?:
. instead of using dc coverter (24v -> 16v)
I want to run my 16v laptop in series with a 9v appliance such as a
radio;
so, will that radio be adversely affected by all the current being
pulled by the laptop? (2.5 amps)
) .
log
7.3.16: stacked
devices to avoid dc converters
. could dc adapter be in series with another dc source ?
if it`s no more than a resistor then it looks like this :
[+-]-ww-
. why couldn't (batt, same batt with resistor) be put in series?
that would be the same as putting the load in the usual way,
and then also putting the resistor in as a 2nd load
so all it would do run the resister very hot
since that resistor was expecting some load to back it up with
additional resistance
.
. if using 2 separate batt's, then the DC-dc adapter could provide the
load that is needed;
as seen in texts, but the batt's must be matched?
I was hoping for 6v batt + (12v batt - 2v converter) - 16v xpw
.
the reason mismatched batts can't be in series
is that a strong one starts charging
the weaker one in front of it,
then why couldn't you simply order the batt's so that the weaker batt
was behind the stronger?
. to show this possible, take the voltage across the strong batt and
it`s load;
if the load varies then determine the lowest resistace (anti-voltage)
that the load offers,
eg,
+12 - { 16 ... 12 } = { -4 ... 0 } -- well, I stopped see that but ...
. the point is that it takes a certain voltage to start charging a batt,
and if your strong batt is countered by a strong resistance,
then as the smaller batt is needing recharge
say 6.8 has gone to 6.1, then you still need more than 6.1 v to start
charging it
. the key question here is finding out what electronics mean when they
require 16v:
does that mean they always result in a 16v drop?
. when xpw is getting hotter then it using more current,
and if voltage was constant, then
increased current meant xpw was offering less resistance,
so the essential question was is xpw going let go of more than 6v?
255:
. instead of using adapter, use which justmakes heat,
use 3 of 6 volt golf cart batt's (eg, optima agm)
and then run the xpw in series with a radio? .
300:
. problem is finding a radio that will take the same amps that xpw will
allow .
955:
. on the other hand,
a 12v is just the same as a pair of 6v in series,
so if they are the same type,
then you should be able to 6+12 just as easily as 6+6+6
. you have to pedal harder for higher voltages,
so you may want to use all 6's anyway,
with a switch that pulls them out of series and into parallel,
so then you need 2 sets of 3 to be charging one while using the other .
. if 12v can be trickle-charged leisurely,
then why can`t 18..20 volts?
. there should be a voltage regulator set that allows this:
put 16v in xpw,
and in parallel put 19v in the 18v 6x3
. then also xpw is getting 16v from a batt
...
. if you are working on the same batt as xpw is getting juice on ... uh
todo:
. study to remember about batt charging,
and how cars and ups's let you charge a batt and use it at the same
time .
1044,
. using an 18v batt doesn't help doesn't help
unless you have a resistor that can stop 2v and take as much flow as
xpw wants;
hence you can't safely use a dc adapter on 18 volts if it's rated for
12v .
1750,
. inspect ppc power needs: nearly 6v (5.4)
web:
. ppc would make a more efficient viewer for mac if it works,
1851,
... but the mac is so power hungry,
I'm not sure why it's important to use a more efficient viewer .
1855,
{ dev.py, dev.ppc, addm/pypy}: collect links from web session .
2300: ...
ppc/in series with
other apps
. get the meter working:
trouble fixed by pushing the leads further into their sockets
. the dc adapter doesn't work on ppc?
try the adapter tip with the ac adapter:
ok? it must be that it's sensitive to voltage out of range;
try running ppc (5.4v) in series with radio (3v) on 9v dc: +9v -
ppc - radio ):
ok? look for other 3v app's
that would be a candidate for
doing away with the dc adapter completely:
( gps -- not used much during ppc use
, voice tape recorders -- has voice-activation so could be on all the
time
, 2nd radio -- might be useful during some ppc use
, 3rd radio -- for when listening to one thing, recording another,
and letting the ppc charge .
, lights
) .
7.3.17:
. found modular systems access with alligator clips,
which were attached to an adapter that had a male (external connects)
for both poles
. on alligator clips,
red is +,
green is - .
there is a mini jack for the tape recorders to hear what's still on the
voice tape players
. found a jack for cassette-radio,
so it`s wired dummy batt's can be used to access something else
ppc/in series with other apps/modularly:
for a modular system that's in series rather than parallel,
you plug into a common bus as before,
but the bus is wired likes so ( <socket#>.{ 1= + , 0= - } ):
1.1 = batt.1;
1.0 = 2.1
2.0 = 3.1
3.0 = batt.0 .
233:
. remember that if you use the modular wire for anything else,
you're likely to confuse them
and then inject power into some data line .
7.4.12: xpw`16vdc
power supply
I have to a buy a dc source for the xpw (16v),
. another option is a 24v system
with the xpw in series for other app's amounting to 8v
how much harder than 12v can it be to pump a 24v system?
nice to know if cycling is too much of a destraction to do work .
. the most efficient and easiest thing
is pedal for 16v and feed it a capacitor .
