Comments for Procrastinatus

Comment on I wonder what we have here…. by aonomus

aonomus — Thu, 05 Nov 2009 19:37:44 +0000

Actually a 1000mL RBF.

Keep in mind that UGT does custom packages, and also has an ebay store, look around for the best prices. UGT has one of the better selections for common glassware (some things are more expensive than expected though, such has hardware/clamps/stands).

Comment on I wonder what we have here…. by worldspawn

worldspawn — Thu, 05 Nov 2009 19:13:26 +0000

Keck clips! And I think I see a beautiful 2000ml RBF.

Very, very nice. I think I’ll be buying from United next. Their prices for 3-necks and giant boiling flasks are definitely reasonable.

How did the heated stir plate hunt go?

Comment on Desulfator build and Lead Acid Revisit by shubham tiwari

shubham tiwari — Sat, 17 Oct 2009 11:56:03 +0000

excellent circuit sir,had great fun building it….the bets part is that this circuit has all easy to find and cheaply available parts,,
i had made 2 of this circuit and they both are working great,also added an led indicator to indicate working and a 15v zener diode….

anyways want to thank you for your great work…
please reply so that i can send the pictures….
and please let me know if any further improvements can be don in it.

thanking you
shubham tiwari
email– shubhamforme@gmail.com

Comment on Using a car alternator as a ‘brushless’ motor by Alternator Motor Update « Procrastinatus

Alternator Motor Update « Procrastinatus — Sun, 20 Sep 2009 14:35:06 +0000

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Comment on Revive ‘dead’ sealed lead acid UPS batteries by aonomus

aonomus — Tue, 25 Aug 2009 17:12:01 +0000

Its not a absolute fix, because its so hard to tell what failure mode the battery suffers from. Good luck though

Comment on Revive ‘dead’ sealed lead acid UPS batteries by Larry Baxter

Larry Baxter — Tue, 25 Aug 2009 15:57:46 +0000

Thanx for info. Will try technique. Tired of wasting money on replacing these batts.

Comment on Revive ‘dead’ sealed lead acid UPS batteries by Desulfator build and Lead Acid Revisit « Procrastinatus

Desulfator build and Lead Acid Revisit « Procrastinatus — Thu, 23 Jul 2009 08:31:21 +0000

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Comment on Coilgun 2.0? by aonomus

aonomus — Mon, 05 Jan 2009 04:24:36 +0000

Reluctance, at 400J I simply don’t have the power to repel via induction non-ferromagnetic objects.

Comment on Dual 2n3055 Flyback Driver by aonomus

aonomus — Mon, 05 Jan 2009 04:21:00 +0000

Personally I doubt the 15cm claim, as the 2n3055 system is a highly inefficient flyback driver. The inductance in the primary windings avalanches through collector-emitter as the circuit is turned off and the voltage rises, generating a ton of waste heat. Ontop of it the 2n3055 doesn’t have that much current capability at the frequencies discussed. From other experiments driving inductive loads at high frequencies, the 2n3055 easily overheats and destroys itself.

The die itself on the 2n3055 is tiny and simply isn’t designed to handle the level of power at the frequency (ie: dead short across an inductive load).

Image: (2n3055 insides)

For 15cm long sparks a ZVS or zero-volt-switching flyback driver would be needed, and those have been known to provide the power needed for 15cm sparks. As a spark is drawn longer the voltage required to sustain it doesn’t necessarily increase (as the plasma is already conductive), but the current required to sustain the arc increases. ZVS drivers can give enough power to destroy regular modern TV flybacks by overheating, burning out the secondaries, etc.

Comment on Dual 2n3055 Flyback Driver by federico

federico — Sat, 03 Jan 2009 19:21:02 +0000

Make a flyback driver is very easy, my flyback driver works at 24v DC with a single 2N3055 transistor and give 20kv out.
It give sparks of 15cm.