|
Post by x on Mar 11, 2006 12:51:00 GMT -8
I am building your proximity detector and I have a couple of questions regarding your circuit.
1.) Are there any advantages or disadvantages when designing this proximity circuit to operate at frequencies higher or lower than 65 Khz? If so, what are the advantages and what are the disadvantages.
2.) What are you referring to earth ground? Do you mean the 'earth ground leads' must tie into the negative end of the power supply?
Thanks for your help.
|
|
|
Post by Gary Lecomte on Mar 12, 2006 5:54:42 GMT -8
In my experiments I found this frequency to work best for me. But it might depend on what your detecting as well as the surrounding objects.
Earth Ground means exactially that, "Earth Ground". In North America all houses have a 3rd wire which is Grounded to the Earth. I would think most other countries also have a simular grounding sysem.
This circuit will work without that ground but for best sensitivity, I recommend you properly ground it as shown. This is Especially Important if you run it on a Battery.
|
|
|
Post by Alvin on Aug 16, 2019 2:50:38 GMT -8
I could not get your circuit to work with a 741 IC.
|
|
|
Post by Alvin on Aug 16, 2019 2:52:12 GMT -8
I haven't tried a TL081 yet. How long must the antenna be, before connecting it to metal plate?
|
|
|
Post by Alvin on Aug 16, 2019 2:53:33 GMT -8
This circuit is difficult to get to work. The relay does not activate with 10K resistor or a 1K resistor.
|
|
|
Post by Alvin on Aug 16, 2019 2:55:20 GMT -8
Can you please post a pic of the circuit with test voltages at certain points so I can test the circuit.
|
|
|
Post by Gary Lecomte on Aug 16, 2019 7:14:27 GMT -8
Test Voltages Seldom Help as Adjusting Trim Pots can Change Readings. Send me some Pictures of what you built. Both the Copper Side and Parts Side.
|
|
|
Post by rezavir8 on Jan 2, 2020 1:29:37 GMT -8
hi send circuit schematic for build shear info please
|
|
|
Post by volkswagenvan on Jan 2, 2020 9:41:54 GMT -8
|
|
|
Post by rezavir8 on Jan 4, 2020 2:29:40 GMT -8
hi this site end register and close please share info
|
|
|
Post by volkswagenvan on Jan 4, 2020 8:51:52 GMT -8
The Link I posted is still up and running!
|
|
|
Post by Jean on Jan 5, 2020 20:09:26 GMT -8
Not sure how many of you are still using Gary's forum and are able to read this but I have just figured out how to get into it and must inform you that Gary sadly passed away on November 7th 2019...
|
|
|
Post by volkswagenvan on Jan 6, 2020 18:05:18 GMT -8
Thank you Jean.
Yes we know.
Jerry
|
|
|
Post by rezavir8 on Jan 8, 2020 5:47:25 GMT -8
Not sure how many of you are still using Gary's forum and are able to read this but I have just figured out how to get into it and must inform you that Gary sadly passed away on November 7th 2019... Gary is alive He answered my email Mon, Jan 6, 2020 at 7:44 AM ؟؟؟؟؟؟؟؟؟؟؟؟؟
|
|
|
Post by volkswagenvan on Jan 8, 2020 9:12:43 GMT -8
rezavir8,... May have been Gary's lady.
|
|