Search found 2840 matches

by haklesup
Thu Jul 02, 2020 1:45 pm
Forum: General Discussion
Topic: Linear power supply problems
Replies: 1
Views: 26

Re: Linear power supply problems

increasing current should just be a matter of adding more output transistors or substituting higher power ones. Increasing voltage is not usually so straightforward but the LM723 should operate up to 40V, you may need to tweak some resistor values though. Study the datasheet and the many examples on...
by haklesup
Wed Jul 01, 2020 3:34 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 331

Re: High Power Ultrasonics

the dog bark should work, maybe throw in a cougar growl for good measure, I can think of all sorts of things a deer should be frightened of. For the poppers, I'm recalling how we used to put freeze mist in a film container and when disturbed they would easily pop open. A motion activated camera will...
by haklesup
Tue Jun 23, 2020 4:03 pm
Forum: General Discussion
Topic: Basics Article on Using Accelerometers?
Replies: 1
Views: 99

Re: Basics Article on Using Accelerometers?

Don't let a steep learning curve turn you off, keep at it and eventually you'll obtain critical mass and an understanding. I've often said, if it doesn't make you angry, you aren't learning. I am aware of three types, Analog output, Serial output and the gyro I am not so familiar with. I would think...
by haklesup
Thu Jun 18, 2020 3:24 pm
Forum: General Discussion
Topic: 4G LTE Interference on OTA Antenna TV
Replies: 16
Views: 439

Re: 4G LTE Interference on OTA Antenna TV

Placing these antennas on top of the tallest nearby mountain or hill when there is one is SOP, it definitely improves line of sight for the microwave links and increases range and reduces multi path interference. The height of the mountain has nothing to do with the height of the antenna, that is de...
by haklesup
Thu Jun 18, 2020 10:54 am
Forum: General Discussion
Topic: 4G LTE Interference on OTA Antenna TV
Replies: 16
Views: 439

Re: 4G LTE Interference on OTA Antenna TV

Look up the towers near you on the internet. One near me is 600 feet and the mountain it is on is just under 2600 ft. It supports multiple stations in the VHF and UHF bands and has clusters of other Microwave and other monopole and dipoles it appears part way up. These are often more complex than th...
by haklesup
Thu Jun 18, 2020 10:33 am
Forum: General Discussion
Topic: Voltage and Current
Replies: 4
Views: 156

Re: Voltage and Current

Going back to the plumbing analogy, Consider a system with 2 buckets of water connected by a tube. We know if we raise one, water will flow from it to the other bucket until they have the same level. If water level determines head pressure in the tube, it is like voltage, it causes water Current to ...
by haklesup
Thu Jun 18, 2020 10:12 am
Forum: General Discussion
Topic: Charging lithium ions
Replies: 10
Views: 486

Re: Charging lithium ions

Simpler would have been one that uses a sense resistor. Sounds like you found its Achilles heel. What load are you testing, I would expect a hall sensor to do better at high current and a sense resistor to do better at low current and better linearity across the whole range. When I just looked at th...
by haklesup
Wed Jun 17, 2020 3:21 pm
Forum: General Discussion
Topic: Multisim simulation error in High-pass Filter Circuit Design
Replies: 2
Views: 90

Re: Multisim simulation error in High-pass Filter Circuit Design

your image did not come through so I think part of the question is missing. I think you would get better answers from the NI MultiSim forum anyway. Assuming you are asking why does my simulation get different results than my calculation? I might guess that the math underlying the simulation was not ...
by haklesup
Tue Jun 16, 2020 12:51 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 331

Re: High Power Ultrasonics

No booby traps, you don't want to injure the deer, that is probably prohibited and it increases your liabilities if a trespasser gets hurt. The electric fence if installed properly should be 100% effective and legal. If you are that far from neighbors, the safety concern is reduced, if you have dogs...
by haklesup
Tue Jun 16, 2020 12:41 pm
Forum: General Discussion
Topic: Charging lithium ions
Replies: 10
Views: 486

Re: Charging lithium ions

That's a nice one. I hadn't seen the hall sensor for DC yet. I never was comfortable putting a sense resistor in series with the car battery. Looks like it may be a little less precise than the sense resistor types but that's still adequate for many applications. A little thought needs to go into ra...
by haklesup
Tue Jun 16, 2020 12:36 pm
Forum: General Discussion
Topic: I'm Starving here....
Replies: 17
Views: 739

Re: I'm Starving here....

There are many ways to learn code online without a formal class you have to pay for. Online support forums exist in many places for just about every programming situation where people are eager to lend a hand to someone learning the trade. Pick a platform and then seek out the forums and resources i...
by haklesup
Fri Jun 12, 2020 3:58 pm
Forum: General Discussion
Topic: I'm Starving here....
Replies: 17
Views: 739

Re: I'm Starving here....

What I mean is if you know how something works, you are more capable of caring for it properly and performing preventative maintenance for example even if repairs are not possible. But there are plenty of fix it topics in our reach but not for others. Tablet and phone screen replacement is one examp...
by haklesup
Fri Jun 12, 2020 3:39 pm
Forum: General Discussion
Topic: 4G LTE Interference on OTA Antenna TV
Replies: 16
Views: 439

Re: 4G LTE Interference on OTA Antenna TV

hard to say what was going on there, did you have more than one earth grounding point? you can get a lot of voltage drop per foot of ground with lightning flowing through it. In any case, the setup is supposed to protect you from a direct strike and not necessarily the equipment. I was trying to fig...
by haklesup
Fri Jun 12, 2020 3:25 pm
Forum: General Discussion
Topic: Charging lithium ions
Replies: 10
Views: 486

Re: Charging lithium ions

I think I know what you mean. I got a panel mount one I was going to put in my explorer to monitor the battery but it was for charge or discharge only (one way) So I need to get back to that project someday and buy the bi-directional meter or wait for a Bluetooth enabled version so I don't have to m...
by haklesup
Fri Jun 12, 2020 3:08 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 331

Re: High Power Ultrasonics

How about an array of deer whistles attached to a compressor hose. Sort of an air horn. With a parabolic reflector, you could even make it directional. You would still need a deer detector, solenoid and trigger circuit but that could just be a flood light motion detector and AC solenoid. Really any ...