Another Merry-Go-Round tester

[Jerry]

I never pass up a chance to copy a good idea. This one came from watching one of dfbowers videos of an TGSL air test.

The 1x3 inch board with holes spaced 1 inch apart is free to move up and down by moving the wood dowel to another hole. This lets the height of the test coins be adjusted from about 5 to 25 inches. This will cover any detector that I am likely to build.

The whole thing is clamped to the table top.

The motor is 12 volts DC from a junk printer. I am driving it with a variable power supply. Most anything will do since the current drain is about 100 ma at the speed I want for testing. I may mount an LM317 between the angle brackets with a nice speed control and on/off switch.

The coins are super glued to a thin stick which is fastened to an old radio knob at the center. One stick has U.S. quarters on it and the other with nickels. It is also very easy to change the height while it is running.

This is my first attempt at posting a new thread so I hope everything turns out ok. I have not been able to figure out how to embed comments between the pictures yet. I also tried posting a video clip of it running but was not able.

thanks for looking

Jerry

[simonbaker]

I never pass up a chance to copy a good idea. This one came from watching one of dfbowers videos of an TGSL air test.

The 1x3 inch board with holes spaced 1 inch apart is free to move up and down by moving the wood dowel to another hole. This lets the height of the test coins be adjusted from about 5 to 25 inches. This will cover any detector that I am likely to build.

The whole thing is clamped to the table top.

The motor is 12 volts DC from a junk printer. I am driving it with a variable power supply. Most anything will do since the current drain is about 100 ma at the speed I want for testing. I may mount an LM317 between the angle brackets with a nice speed control and on/off switch.

The coins are super glued to a thin stick which is fastened to an old radio knob at the center. One stick has U.S. quarters on it and the other with nickels. It is also very easy to change the height while it is running.

This is my first attempt at posting a new thread so I hope everything turns out ok. I have not been able to figure out how to embed comments between the pictures yet. I also tried posting a video clip of it running but was not able.

thanks for looking

Jerry

Very nice! An idea I'd like to copy also.

I just wonder if the motor is far enough from the coil to not cause any noise. Easy to test for that looking at the output of the LM308s (TGSL).

Now you've got the equipment to do the test of a ferrite piece with the coils nulled to both sides of minimum, taking video of output of LM308 (.1 sec/div)!

Excellent work!

Regards,

-SB

P.S. For posting video, most people put it on YouTube and just embed a link in the message.

I don't think there is a way to put text between uploaded photos. Instead, you can put photos on a website and embed picture links in your text.

[Jerry]

Thanks Simon. I have not been able to tell any difference on the noise with the motor on or off.

I will have to see if I can break a few smaller pieces of ferrite off of some larger bars I have.

Will be gone for the weekend so will give it a try next week time permitting.

Jerry

[Qiaozhi]

I also tried posting a video clip of it running but was not able.

If the file is not too large you can attach it as a zip file.
I also removed your duplicate post.