Thanks for explaining the input protection. I wasn't familiar with the THAT1200 series, and you motivated me to pull up the data sheet. That's a fairly impressive part, especially for the cost.
It sounds like you're making good progress. I look forward to your future notes.
Cheers -- KtG
Search found 23 matches
- Tue Dec 01, 2020 10:57 am
- Forum: Circuits, schematics and manuals
- Topic: Any chance of some schematic review?
- Replies: 11
- Views: 10231
- Sat Nov 28, 2020 12:28 am
- Forum: Circuits, schematics and manuals
- Topic: Any chance of some schematic review?
- Replies: 11
- Views: 10231
Re: Any chance of some schematic review?
I haven't tuned into the Trolls in a while, so I know I'm late to the game here, but I thought I'd mention that D21 seems to be backwards in the clip detector. I'm puzzled by the protection diode arrangements on the Input Stage sheet (D1-3, D6-10). As drawn, they limit the voltages at the +/- inputs...
- Wed Sep 28, 2016 5:43 pm
- Forum: Experimenters' & Innovators' forum
- Topic: A Futile Chip-Vacuum Project
- Replies: 20
- Views: 3091
Re: A Futile Chip-Vacuum Project
Grooveguy, We love failures! How else will one find out what's possible? I'm going to say that both Soulbear and Epicenterbryan are correct. Tandem fans need either (1) a large-ish plenum space between stages, or (2) a flow-straightening element between stages, or (3) counter-rotating blades. All th...
- Tue Jun 21, 2016 2:20 pm
- Forum: Experimenters' & Innovators' forum
- Topic: Reversing an aquarium vacuum pump
- Replies: 37
- Views: 6588
Re: Reversing an aquarium vacuum pump
Soulbear, is that 3 psi figure for static vacuum (sealed jar), or is it with the chip suction flowing? If it's the static vacuum, then I'm wondering how much it drops with chip suction, which would lower the available platter clamping force. Thanks.
Regards -- KtG
Regards -- KtG
- Thu Feb 18, 2016 4:34 pm
- Forum: Secrets of the Lathe Trolls
- Topic: Scully lamp socket/bulb holder
- Replies: 7
- Views: 1124
Re: Scully lamp socket/bulb holder
That pipe looks like it has a U.S. standard 1/2" IPS (pipe) thread, but as Bahndahn pointed out, you'll need to check this. If it does, then you might be able to use a socket like this Leviton 10051, plus a 1/2" close pipe nipple: Leviton_10051.jpg I can't tell from the photos how the shade is attac...
- Sun Feb 07, 2016 3:33 pm
- Forum: Experimenters' & Innovators' forum
- Topic: Deep Grooves Mastering - Project Bladerunner
- Replies: 501
- Views: 86048
Re: Deep Grooves Mastering - Project Bladerunner
Opcode66, do you plan to saw a slot across those aluminum forms, maybe on the side opposite the wire-start hole? It seems to me that such a massive shorted turn is going to waste a lot of your coil drive power as heat, whether the coil is moving or not. Regards -- KtG P.S. It's eddy current, not edd...
- Mon Nov 16, 2015 2:41 pm
- Forum: Classifieds & tip-offs
- Topic: AIRPOT dampers for sale
- Replies: 2
- Views: 865
SOLD OUT
Thanks to the buyers (in three countries!). I've made a donation to Steve E. for this site from the proceeds.
Thanks also to uvoscillator and jesusfwrl for posting photos of your mounting systems.
Regards -- KtG
Thanks also to uvoscillator and jesusfwrl for posting photos of your mounting systems.
Regards -- KtG
- Sat Oct 03, 2015 2:52 pm
- Forum: Experimenters' & Innovators' forum
- Topic: Heater Supply Schematics
- Replies: 11
- Views: 2114
Re: Heater Supply Schematics
Hi jesusfwrl, You're right, the LM317T is rated 1.5 A. My most recent usage was the LM317M, so I had 500 mA on my mind. On the issue of power dissipation, I'll accept that the LM317T can probably dissipate 20 W (although the Fairchild data sheet says only "internally limited"). My point was that the...
- Fri Oct 02, 2015 12:38 pm
- Forum: Experimenters' & Innovators' forum
- Topic: Heater Supply Schematics
- Replies: 11
- Views: 2114
Re: Heater Supply Schematics
Soulbear, I grew up building stuff with relays, so I love "clatter and bang!" ICs and MOSFETs are just too darn quiet. But I'm also passionate about reverse-engineering things because of what I might learn that I can incorporate into my regular work as an EE. When I see something unusual in a schema...
- Thu Oct 01, 2015 8:28 pm
- Forum: Experimenters' & Innovators' forum
- Topic: Heater Supply Schematics
- Replies: 11
- Views: 2114
Re: Heater Supply Schematics
Hi Soulbear, Are you sure that's drawn correctly? I don't see a reason for the diode being connected to the right end of the 220 ohm resistor, and as drawn, the available output current is rather limited. In fact, the higher the voltage setting, the less output current is available. It makes more se...
- Mon Sep 28, 2015 12:38 pm
- Forum: Secrets of the Lathe Trolls
- Topic: Possible dash pot replacement for ALL lathes.
- Replies: 23
- Views: 2797
Re: Possible dash pot replacement for ALL lathes.
Folks,
I always appreciate the ingenuity of the folks on this board in creating solutions like this!
Aside from that, this thread has finally convinced me to part with some Airpot dampers I acquired about 30 years ago. Here's the Classified Ad post.
Regards -- KtG
I always appreciate the ingenuity of the folks on this board in creating solutions like this!
Aside from that, this thread has finally convinced me to part with some Airpot dampers I acquired about 30 years ago. Here's the Classified Ad post.
Regards -- KtG
- Mon Sep 28, 2015 12:30 pm
- Forum: Classifieds & tip-offs
- Topic: AIRPOT dampers for sale
- Replies: 2
- Views: 865
AIRPOT dampers for sale
Hi folks, For those of you wishing to add damping to your cutterhead suspension, one of these just might be the answer: Photo-1.jpg Photo-2.jpg This is an Airpot dashpot, carrying the custom part no. 64264-3. It appears to be the same as a type 2K160A, with a .627" bore, a 1" stroke and adjustable t...
- Sun May 31, 2015 12:26 pm
- Forum: The Reference Archive
- Topic: Photo of Scully lathe at Gold Star, 1967
- Replies: 5
- Views: 1567
Re: Photo of Scully lathe at Gold Star, 1967
By the way, the gentleman at the center of the top photo is almost certainly Howard Holzer (of HAECO). I withhold 100% certainty because I didn't know him until 1969-1974, and he's a bit younger in that photo than I remember him. I don't know what association Howard had with Gold Star, but (1) it wo...
- Tue Mar 24, 2015 12:46 pm
- Forum: Experimenters' & Innovators' forum
- Topic: You wanna innovate? Make a good hi torque turntable
- Replies: 31
- Views: 8000
Re: You wanna innovate? Make a good hi torque turntable
Clearly, this is the solution you've been waiting for:
A working turntable made out of Legos
Adding the Lego feedscrew and cutterhead suspension is an exercise left for the reader...
-- KtG
A working turntable made out of Legos
Adding the Lego feedscrew and cutterhead suspension is an exercise left for the reader...
-- KtG
- Sun Jan 11, 2015 5:54 pm
- Forum: Newbie Forum
- Topic: A Silly question, Maybe (using an old telephone ringer)
- Replies: 2
- Views: 662
Re: A Silly question, Maybe (using an old telephone ringer)
It takes very little power to energize a mechanical telephone ringer, only about 1 watt. However, the impedance is very high, so it takes a lot of voltage. You may have seen the term Ringer Equivalence Number or REN printed on wireline telephones. 1 REN is equal to the impedance of a "traditional" m...
- Tue Apr 01, 2014 12:52 pm
- Forum: Playback!
- Topic: One for All the Math Geniuses
- Replies: 6
- Views: 7804
Re: One for All the Math Geniuses
And he's not going to be bothered by seeing the disc spinning at half speed?He's also a stickler for detail, into vinyl ...
Just sayin'... KtG
- Tue Jan 29, 2013 10:12 am
- Forum: Our Cutters and their work
- Topic: Lurkers' thread. Say hi once, OK?
- Replies: 83
- Views: 137685
Re: Lurkers' thread. Say hi once, OK?
I haven't been in the audio business in 35 years, but I peek in here almost every day. I love the enthusiasm and creativity the members show for this "mature" technology. Keep on cuttin'!
Cheers,
KtG
Cheers,
KtG
- Thu May 10, 2012 12:32 pm
- Forum: The Reference Archive
- Topic: Old RCA book with Scully lathe.
- Replies: 4
- Views: 2023
- Sat Apr 28, 2012 9:58 am
- Forum: Classifieds & tip-offs
- Topic: Ebay : Scully / HAECO complete system
- Replies: 4
- Views: 1269
Ebay : Scully / HAECO complete system
Item # 290694440792
Scully lathe modified with VP-1000 control, SC-2 cutterhead, $25K obo.
Just FYI! -- KtG
Scully lathe modified with VP-1000 control, SC-2 cutterhead, $25K obo.
Just FYI! -- KtG
- Tue Apr 10, 2012 11:46 am
- Forum: Services
- Topic: suction tubing for VMS70
- Replies: 7
- Views: 2450
Surgical hose is very flexible, but not very resistant to crushing from vacuum. It's been a long time since I saw a Neumann setup, but I seem to remember that it used a gum rubber hose. Go to McMaster-Carr's web site and search on 5543K46 as a starting point, and you'll see a whole pageful of sizes ...