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David Stoll (Davidstoll)
New member
Username: Davidstoll

Post Number: 1
Registered: 10-2005
Posted on Tuesday, October 18, 2005 - 10:58 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Three penny radio not working....embarrassed.

I have checked all the connections with a volt meter for connectivity and all the right spots are connected. The transistor is oriented the correct way, the resistors are in the right spots. There aren't any wires that are accidentally touching things they shouldn't. It looks exactly like the picture and I followed the directions exactly. I get absolutely no sound.

What could be wrong?
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Simon Quellen Field (Sfield)
Senior Member
Username: Sfield

Post Number: 764
Registered: 12-2004
Posted on Wednesday, October 19, 2005 - 12:15 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

The earphone could be polarized by a static electric spark.
To depolarize it, simply drop it on the table from a height of about 6 inches.
This will generate a current in the piezoelectric element, and neutralize
any residual charge.

If you get clicks and scratchy noises from the earphone when you touch the
wires together, then this is not the problem.
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David Stoll (Davidstoll)
New member
Username: Davidstoll

Post Number: 2
Registered: 10-2005
Posted on Thursday, October 20, 2005 - 9:26 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Thank you for the suggestion, however it did not seem to help. The earpiece clicks when the ends touch. Also, I have a second earphone that I bought from the store for another project.
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David Stoll (Davidstoll)
New member
Username: Davidstoll

Post Number: 3
Registered: 10-2005
Posted on Monday, October 24, 2005 - 12:58 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

I may not have made it clear...the second earpiece did not help either....
Any other suggestions?
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mike (Mike11298)
New member
Username: Mike11298

Post Number: 3
Registered: 10-2006
Posted on Friday, December 15, 2006 - 7:03 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

make sure your components are in working order - if they are salvaged, old or were in a poor condition, its a good idea to check them. also, make sure your battery is good.

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