|
Some of these posts are very old and might contain outdated information. You may wish to search for newer posts instead.
|
splifner180
Student


Registered: 03/24/06
Posts: 1,288
Loc: USA, East Coast
Last seen: 1 year, 3 months
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: creamcorn]
#5615769 - 05/11/06 12:10 AM (17 years, 8 months ago) |
|
|
creamcorn wrote: "...that will let you turn it down from 100% speed to about 75% speed, not too useful."
Actually, that would be perfect. I found a 9VDC transformer and it was just a smidge too slow. Since 75% of 12VDC would bring me to 9VDC, I think that would work well. Did you happen to get a stock number? I'm not sure they'd know what I was looking for.
"try your 9v adapter first. if it does the trick, you're golden. if its still a little too fast, the radio shack rheostat is the ticket. if its too slow, you can move back to the 12v, and might be able to get away with something like this in series with the radio shack rheostat."
Why would I need the resistor with the rheostat?
Hm. Maybe I *should* just use the 9VDC...
splif
-------------------- First Grow: Ecuador -> LC -> HPoo/Straw -> Monotub Build a Do-It-Yourself Magnetic Stirrer in thirty minutes with no money.
|
splifner180
Student


Registered: 03/24/06
Posts: 1,288
Loc: USA, East Coast
Last seen: 1 year, 3 months
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: splifner180]
#5615836 - 05/11/06 12:26 AM (17 years, 8 months ago) |
|
|
Ah, screw it. I went back to the 9VDC and it's creating a vortex that extends downward about 1" and no more.
Perfect.
Granted, not nearly as much fun to watch but I don't have to rig anything up.
splif
-------------------- First Grow: Ecuador -> LC -> HPoo/Straw -> Monotub Build a Do-It-Yourself Magnetic Stirrer in thirty minutes with no money.
|
alsnow469
Stranger

Registered: 10/15/05
Posts: 392
Last seen: 6 months, 13 days
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: Snaggletooth]
#5615922 - 05/11/06 01:01 AM (17 years, 8 months ago) |
|
|
My stirrerrers make the flea as my brother calls it
, he does lab work, makes the 2" flea jump
up and down . Thats cool too.
These will be handy at Halloween.
|
blacklabrat
Stranger

Registered: 09/07/04
Posts: 77
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: splifner180]
#5616539 - 05/11/06 09:33 AM (17 years, 8 months ago) |
|
|
Splif,
Personally found my best LCs have been made with very little, if any vortex while the mycelium is scaling up. Just enough to keep everything in suspension. Then a few hours before using the LC for inoculating I'll crank the RPMs to full throttle to break the little balls of mycelium into finer strands.
The method I use with my DYI stirrer is pretty low tech: I sit 2 CD jewel cases between the stirrer and jar for the first 4-5 days. This removes the stir rod just far enough from the magnet to give me the optimal stirring action. Remove CD cases and set directly on the plate prior to using the LC.
You can also use a stack of wide index cards instead of the CD cases. Add or remove cards to dial in and fine tune your set up.
simple - cheap - effective.
hope this helps
|
creamcorn
mad scientist


Registered: 03/13/06
Posts: 2,962
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: splifner180]
#5616652 - 05/11/06 10:38 AM (17 years, 8 months ago) |
|
|
Quote:
splifner180 said: creamcorn wrote: "...that will let you turn it down from 100% speed to about 75% speed, not too useful."
Actually, that would be perfect. I found a 9VDC transformer and it was just a smidge too slow. Since 75% of 12VDC would bring me to 9VDC, I think that would work well. Did you happen to get a stock number? I'm not sure they'd know what I was looking for.
"try your 9v adapter first. if it does the trick, you're golden. if its still a little too fast, the radio shack rheostat is the ticket. if its too slow, you can move back to the 12v, and might be able to get away with something like this in series with the radio shack rheostat."
Why would I need the resistor with the rheostat?
Hm. Maybe I *should* just use the 9VDC...
splif
Its the only rheostat they carry. The store had the same exact selection of parts as the website, I'm betting its pretty uniform at all the stores. This is it. I guess I was a little confusing there. I meant either use only the 25ohm rheostat with the 9V, or use the resistor and the rheostat with the 12V... that would actually give you LESS than the 9V by itself, and now that you know the 9V alone is a little too slow, it sounds like what you want is the 12V with the 25ohm rheostat, skip the resistor.
P.S. if its still a little too fast with the 12V and 25ohm rheostat at its lowest setting, another trick is to use diodes. a Si diode (the standard black guys with the white stripe) will drop voltage 0.7v when wired in series. using one or two of them would be a perfect way to fine-tune it, and they're cheap.
Edited by creamcorn (05/11/06 10:46 AM)
|
splifner180
Student


Registered: 03/24/06
Posts: 1,288
Loc: USA, East Coast
Last seen: 1 year, 3 months
|
Re: Magnetic Stirrer Vortex; Too Much? [Re: creamcorn]
#5616987 - 05/11/06 12:16 PM (17 years, 8 months ago) |
|
|
blacklabrat writes: "Personally found my best LCs have been made with very little, if any vortex while the mycelium is scaling up. Just enough to keep everything in suspension. Then a few hours before using the LC for inoculating I'll crank the RPMs to full throttle to break the little balls of mycelium into finer strands."
A couple of vets here recommended a similar method and that's the technique I'm going to use.
"You can also use a stack of wide index cards instead of the CD cases. Add or remove cards to dial in and fine tune your set up."
That is an extremely cool idea. I have vinyl CD sleeves kicking around so I'll kinda be using CD jewel cases but they'll be index-card thick. Best of both worlds. =)
creamcorn writes: "...and now that you know the 9V alone is a little too slow, it sounds like what you want is the 12V with the 25ohm rheostat, skip the resistor."
After talking to some people about the correct vortex size/speed (pretty much no vortex, just a stir), I re-wired the 9 VDC and found it to be perfect.
But a big thanks for your input. I didn't know that about diodes. I'll keep that in the back of my skull if the need arises.
splif
-------------------- First Grow: Ecuador -> LC -> HPoo/Straw -> Monotub Build a Do-It-Yourself Magnetic Stirrer in thirty minutes with no money.
|
|
|
You cannot start new topics / You cannot reply to topics HTML is disabled / BBCode is enabled
Moderator: Shroomism, george castanza, RogerRabbit, veggie, mushboy, fahtster, LogicaL Chaos, 13shrooms, Stipe-n Cap, Pastywhyte, bodhisatta, Tormato, Land Trout, A.k.a 5,064 topic views. 20 members, 141 guests and 24 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ] |
|