Search found 42 matches

by bdickens
Sat Sep 10, 2005 1:34 pm
Forum: General Discussion
Topic: Aquarium Backup
Replies: 6
Views: 1595

Aquarium Backup

I'm using an inverter to power my aquarium pump when the power goes off. But I need to manually unplug the pump from AC, and move it to the Inverter. Is there a really simple circuit that would cut to the inverter when the AC went off ? Ideal would be to have another to recharge the battery when it ...
by bdickens
Sat Apr 30, 2005 7:13 am
Forum: General Discussion
Topic: Charging from Multiple sources
Replies: 1
Views: 1019

Charging from Multiple sources

My son and I are working on a (mostly) human powered boat. For lots of reasons, we are going to use an pair of electric motors, powered by some deep discharge batteries. The charging will be done by pedaling the generator circuit. Our test bed worked fine with one battery. <p>In thinking about this,...
by bdickens
Mon May 20, 2002 6:20 pm
Forum: Robotics
Topic: Monitoring Battery Condition
Replies: 1
Views: 2138

Monitoring Battery Condition

Anyone got a simple ( ie beginner level) way to measure the volt/amp condition of a set of nicads with a microcontroller ? I need to make sure that the batteries driving my tethered robot are ok and have it return if they drop below a certain point. 7X1400mah cells.
by bdickens
Sun May 19, 2002 9:25 am
Forum: General Discussion
Topic: Another ROV Question -Tilt
Replies: 7
Views: 2321

Another ROV Question -Tilt

I'm spending a lot of effort keeping my UW ROV level so to speak. I would like to add a simple circuit to sense pitch and roll and correct automatically. <p>Any ICs out there for that ? I have a tilt switch from a pinball but it's a bit too "mechanical". <p>Recommendations ?
by bdickens
Sun May 19, 2002 9:04 am
Forum: General Discussion
Topic: Do Compasess work underwater ?
Replies: 3
Views: 1635

Re: Do Compasess work underwater ?

Thanks. I'll order and configure.
by bdickens
Sat May 18, 2002 3:03 pm
Forum: General Discussion
Topic: Do Compasess work underwater ?
Replies: 3
Views: 1635

Do Compasess work underwater ?

ok; it's probably a stupid question but I've been surprised before. <p>I've got an underwater ROV that needs to be able to tell me at least what direction it's heading. I was going to lookup and purchase an IC Compass. Any issues ? <p>Thanks
by bdickens
Sat Mar 30, 2002 1:34 pm
Forum: General Discussion
Topic: 1500ma from a 12V battery
Replies: 2
Views: 1652

1500ma from a 12V battery

I've just gotten a new video camera for a project and the Powersupply is 12v 1500ma but from AC. My old camera used a 9v transitor battery and I am hoping to power the camera from either a second set of batteries or the automotive battery on the boat. While both are 12V,I don't think I want to conne...
by bdickens
Thu Jan 10, 2002 9:04 am
Forum: Robotics
Topic: p.p.m to p.w.m conversion
Replies: 5
Views: 4771

Re: p.p.m to p.w.m conversion

I asked a similar question around OOPIC processing not long ago. I ended up using a PAK-VII pulse input coprocessor ( Al Williams)<p>My intent was to read a servo and convert to something I could manipulate using the oopic and send it on to the servo. Seems to work on my test bed and the instruction...
by bdickens
Sun Jan 06, 2002 8:43 am
Forum: General Discussion
Topic: High AMP Conversion
Replies: 1
Views: 1529

High AMP Conversion

I need to provide about 20AMPS of power @ 9-12 volts. All the voltage regulators I see stop at a max of 5 amps. <p>Are there components rated for 20 or do I have to choose a different direction ?
by bdickens
Mon Dec 24, 2001 6:50 am
Forum: General Discussion
Topic: Multiple Speed Controls
Replies: 4
Views: 2850

Re: Multiple Speed Controls

btw: I gave the total battery capacity in the original because I'm not sure what makes a difference. They are multiple cell packs in series.<p>Thanks
by bdickens
Mon Dec 24, 2001 6:39 am
Forum: General Discussion
Topic: Multiple Speed Controls
Replies: 4
Views: 2850

Re: Multiple Speed Controls

Sorry for the delay. Business Travel. <p>Yes, if you can sketch out the circuit I would appreciate it. I can't afford the power loss from the resistor network athough I at least understand that one !<p>Thanks
by bdickens
Sat Dec 08, 2001 1:45 pm
Forum: General Discussion
Topic: Multiple Speed Controls
Replies: 4
Views: 2850

Multiple Speed Controls

I'm driving four motors and one computer from one battery pack. Two of the motors ( and their speed controls) will handle the current direct from the battery. Two motors and the CPU however, will not. They need quite a bit less. <p>So I need to drop 12V,3000 mah to 9V, 300 mah for the computer and 9...