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Old 12th April 2012, 09:29 AM   #4951
AndrewT is offline AndrewT  Scotland
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Quote:
9.5V is too close to 5V.
Quote:
Originally Posted by dtses View Post
I didn't get your post at all.
9.5 - 5 = 4.5
That is far too low to meet the >=7V requirement for the voltage drop across a Salas Style Shunt Regulator.
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Old 12th April 2012, 02:19 PM   #4952
jeepy is offline jeepy  Switzerland
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Default Remote sensing

Would anybody explain me the remote sensing concept (Force wires)? Many thanks!
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Old 12th April 2012, 02:24 PM   #4953
Salas is online now Salas  Greece
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Kelvin (4-wire) resistance measurement : DC METERING CIRCUITS
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Old 12th April 2012, 05:18 PM   #4954
jeepy is offline jeepy  Switzerland
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Measurement purpose only! Thanks Salas
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Old 12th April 2012, 07:37 PM   #4955
Salas is online now Salas  Greece
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Its exactly the same purpose in the regulator too. The error amplifier is aided to ''see'' the actual voltage deviations at the remote nodes of interest, skipping to a large extent the effect of cabling in between.
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Old 13th April 2012, 06:35 AM   #4956
pidesd is offline pidesd  Canada
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Default battery charger

hello all,

i drew a minimalist battery charger while waiting for parts for the jfet CCS SSLV3.3V i am playing with.i m also trying to find P mosfet to allow the use of 1 battery pack for several regs.

please consider that this is merely an attempt to create a charger. i am not an EE.

the charger section was design taking bits from the lm317 datasheet and the rest is my creation.

it can accept any battery type.

there is an optional protection circuit for lithium types. if the battery voltage falls below a certain voltage set by R6, M1 shuts down and only a tiny current runs through the divider. r8 sets the relay coil_3 current. for around 6V-7V battery operation, use a high Vgs high Yfs fet like irf540, r6=1M r8 =100R and a 3Vdc (or so) relay.

as drawn, the circuit is playing music. if you close the power switch, it turns to charge state. some circuit parts are to be determine because they depend on the charge voltage and charger can be found if you look at the datasheet. the charger has a current limiter and the current diminishes until the battery reaches the desired voltage where no current will flow.



personally, i m a bit concern that coil_1 may induce noise in the circuit. maybe a separate dc coil with own small main trafo and rectifier always on is a good alternative?

notes:
-coil_1 is there relay coil to sw_1, etc.
-capacitor better be a high endurance type like nichicon HE
- you can parallel charge circuit to charge batteries individually and the protection circuit can be adapted to ''monitor'' lithium cells individually.


if you have any suggestion, comments, questions or concerns, please express yourself.

if you see any nonsense, just tell me
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File Type: jpg batt_chrg_circ.jpg (57.8 KB, 396 views)

Last edited by pidesd; 13th April 2012 at 07:01 AM.
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Old 13th April 2012, 06:48 AM   #4957
pidesd is offline pidesd  Canada
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Quote:
Originally Posted by stormsonic View Post
@pidesd
graphite resistor should be your next project?
GRAPHITE RESISTORS
have you tried it? if so what is your impression? looks not that easy to build...

Last edited by pidesd; 13th April 2012 at 06:53 AM.
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Old 13th April 2012, 06:52 AM   #4958
pidesd is offline pidesd  Canada
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Salas,a few pages ago, you commented:

Quote:
Originally Posted by Salas View Post
The R6 for CCS substitution I had tried back in the inception days and I did not like it too. Low capacitance Jfets main CCS is great if making for low currents. Its just so much quiet and fast using high gm low noise parts. As for pre-filters, members always rated CLC high instead of CRC. If for resistor, they rated thick film high in DCB1 over MOX. Your findings ring valid in other words. Post a schematic with your parts of choice and settings for the low current TO-192 nice cute mini 1.2R if you may, there are many members who want for a clock, opamp etc.
when you say ''Its just so much quiet and fast using high gm low noise parts.''

do you mean that jfet Yfs in CCS is important? if so, how?

Last edited by pidesd; 13th April 2012 at 07:07 AM.
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Old 13th April 2012, 12:25 PM   #4959
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Any idea if these will be legit?
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Old 13th April 2012, 12:29 PM   #4960
AndrewT is offline AndrewT  Scotland
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Cheap enough and you get postage included.
For a 3W, 1% resistor it is worth taking the chance.
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