Search found 158 matches

by GoingFastTurningLeft
Tue Feb 16, 2010 5:47 pm
Forum: General Discussion
Topic: Using a 32V fuse holder with 120V?
Replies: 15
Views: 3075

Re: Using a 32V fuse holder with 120V?

I learned a lesson, for once I should have gone to Radio Shack first. They carry several in-line 1/4" x 1 1/4" glass fuse holders. They are labeled 'automotive' but have a 250VAC rating. The one I picked up clearly has '250VAC 10A' printed right on the side of it. I believe another one I looked at s...
by GoingFastTurningLeft
Wed Feb 03, 2010 2:43 pm
Forum: General Discussion
Topic: Using a 32V fuse holder with 120V?
Replies: 15
Views: 3075

Re: Using a 32V fuse holder with 120V?

Of course the box is plastic, otherwise the PCB under the outlet would short out :grin: The devices I will be switching with it don't have ground prongs so I didn't use a grounding power cord. The more I discuss this part of the project with you N&V guys and a co-worker the more doubts I have. This ...
by GoingFastTurningLeft
Mon Feb 01, 2010 4:17 pm
Forum: General Discussion
Topic: Using a 32V fuse holder with 120V?
Replies: 15
Views: 3075

Re: Using a 32V fuse holder with 120V?

Only one of the terminals is spring loaded. Well if it means anything, it's labelled Made in the USA. I doubt Cooper Bussmann would cheap out on something like insulation. I'd be surprised if anybody even makes 14 gauge wire with a dialectric strength under 300V. I'm going to let it cycle some more ...
by GoingFastTurningLeft
Sun Jan 31, 2010 8:07 pm
Forum: General Discussion
Topic: Using a 32V fuse holder with 120V?
Replies: 15
Views: 3075

Re: Using a 32V fuse holder with 120V?

Yes, your standard 250V/2amp fast-blow fuse. The inline fuse made it easier and safer to install in my case, since it is crammed into the space below the outlet in a single gang 'new work' box along with a pcb that holds the relay and switching transistor.
by GoingFastTurningLeft
Sun Jan 31, 2010 4:04 pm
Forum: General Discussion
Topic: Using a 32V fuse holder with 120V?
Replies: 15
Views: 3075

Using a 32V fuse holder with 120V?

I am working on a temperature controller that switches 120V power using a relay. It's going to be used with a purpose-built 40W heating pad attached to the side of my beer fermenter in order to stop it from getting too cold. I'll probably use it with a fan in the summer months. I assembled everythin...
by GoingFastTurningLeft
Fri Jun 26, 2009 1:32 pm
Forum: General Discussion
Topic: Counterfeit Hardware.
Replies: 14
Views: 2778

Re: Counterfeit Hardware.

Once I bought 100W light bulbs from a dollar store.

When I turned on the lamp it tripped the breaker.

We reset it and I tried the other one. This one fried my surge protector.

Never buy light bulbs at a dollar store!
by GoingFastTurningLeft
Tue Jun 02, 2009 3:41 pm
Forum: General Discussion
Topic: Blew out power mosfets at low power?
Replies: 5
Views: 1470

Re: Blew out power mosfets at low power?

I just pulled them out and checked them again, looks like I was confused testing them in circuit. DS is shorted on 3, everything is shorted on the 4th. May have overheated it removing it. Its an AVR connected to some FQP30N06L (60V LOGIC N-Channel) power mosfets via 1.5K resistors. http://www.fairch...
by GoingFastTurningLeft
Tue Jun 02, 2009 6:22 am
Forum: General Discussion
Topic: Blew out power mosfets at low power?
Replies: 5
Views: 1470

Re: Blew out power mosfets at low power?

I haven't added any protection. These are not big motors, all they do is spin an off-center weight to induce vibration, I don't know what the inrush is but steady state they draw about 115mA @ 12VDC. The only other parts are a small disc cap across motor terminals. Originally they were wired through...
by GoingFastTurningLeft
Mon Jun 01, 2009 6:56 pm
Forum: General Discussion
Topic: Blew out power mosfets at low power?
Replies: 5
Views: 1470

Blew out power mosfets at low power?

I have a simple motor interface circuit I designed to control the motors in a massage pad with the intent of getting tactile feedback from a racing simulator. Its an AVR connected to some FQP30N06L (60V LOGIC N-Channel) power mosfets via 1.5K resistors (what I had sitting around). Motors have a +12V...
by GoingFastTurningLeft
Thu Jan 15, 2009 9:08 pm
Forum: General Discussion
Topic: The newest registered user is Forrest Mims III
Replies: 26
Views: 6514

I remember using that 555 book and another book a whole bunch when I was getting my feet wet back 15 years ago.

Thanks for everything Mr Mims.
by GoingFastTurningLeft
Tue Nov 25, 2008 4:27 pm
Forum: General Discussion
Topic: RadioShack prototyping pcbs?
Replies: 9
Views: 2646

RadioShack prototyping pcbs?

I was reading the article on breadboarding and saw the picture of the RadioShack 276-158B board, which has 3 hole pads and 2 busses running throughout (should have shown it in the article!). Great for IC projects when you need something bigger than the 1.5"x3" 276-150. My problem is that all 3 radio...
by GoingFastTurningLeft
Thu Nov 20, 2008 11:17 am
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 10185

I will build the device you showed me, Bigglez, with 10K pots (audio taper?) as suggested by CeaSaR, because one thing I am concerned about is over-driving any device I plug the unit into! Its a moot point but for my two cents worth I would place the gain controls ar the input of this circuit. It h...
by GoingFastTurningLeft
Tue Nov 04, 2008 5:50 am
Forum: General Discussion
Topic: HVAC design questions
Replies: 17
Views: 4405

I'm using an ATmega48. Current generation AVR's have a 1.1V internal reference voltage, so 1.1/1024 = 1.07mV/step... works out to around 9 steps/C, so around 4-5 steps/F. This is what makes it nice to use a part that outputs 0V to 1V from freezing to boiling temperatures as its output range matches ...
by GoingFastTurningLeft
Thu Oct 30, 2008 7:33 am
Forum: General Discussion
Topic: HVAC design questions
Replies: 17
Views: 4405

Coincidence - I have just completed working out a design for a room thermostat- heating system only. I was curious why you chose the LM35 (Celsious) instead of the LM34 (Farenheit). If you arent concerned with a calibrated readout on your control then it may just be a moot point. I also noticed in ...
by GoingFastTurningLeft
Thu Oct 30, 2008 6:58 am
Forum: General Discussion
Topic: RadioShack Recalls Power Supplies
Replies: 8
Views: 2071

Bigglez wrote:
Robert Reed wrote:comes at a price!
Broken link?... It doesn't work.
The link was made in China.