Powered by Invision Power Board


Forum Rules Forum Rules (Please read before posting)
  Reply to this topicStart new topicStart Poll

> Neon Bulb In Antenna Circuit
Hamra
Posted: September 18, 2016 03:25 pm
Reply to this postQuote Post


Newbie
*

Group: Members+
Posts: 3
Member No.: 40,247
Joined: September 18, 2016




Hello!

What would be the purpose of a small neon bulb connected in parallel with 1 MOhm resistor inside the old, 1970s Panasonic radio?

The "bottom" side of resistor is connected to Ground/Earth connector on the back side of the radio, where external ground can be hoked up.

Another side of resistor is connected to capacitor, which has connection to a whip antenna (with all subsequent circuitry), as well as connected to External Antenna connector, which is also on the back side of the radio.
PMEmail Poster
Top
kellys_eye
Posted: September 18, 2016 05:01 pm
Reply to this postQuote Post


Forum Addict ++
*******

Group: Spamminator Taskforce
Posts: 11,418
Member No.: 2,735
Joined: June 21, 2005




It's used to discharge static build-up before it can cause any damage to the receiver front end.

Not such a problem with receivers using built-in ferrite rod aerials but any radio using an external or telescopic antenna may be prone to damage during electrical storms.


--------------------
May contain nuts
PMEmail PosterYahoo
Top
Hamra
Posted: September 18, 2016 06:50 pm
Reply to this postQuote Post


Newbie
*

Group: Members+
Posts: 3
Member No.: 40,247
Joined: September 18, 2016




What would be the approximate static voltage to cause the neon to "fire up"?

This post has been edited by Hamra on September 18, 2016 06:54 pm
PMEmail Poster
Top
Sch3mat1c
Posted: September 18, 2016 11:46 pm
Reply to this postQuote Post


Forum Addict ++
Group Icon

Group: Moderators
Posts: 20,505
Member No.: 73
Joined: July 24, 2002




Around 60V for an NE-2.

Tim


--------------------
Answering questions is a tricky subject to practice. Not due to the difficulty of formulating or locating answers, but due to the human inability of asking the right questions; a skill that, were one to possess, would put them in the "answering" category.
PMEmail PosterUsers Website
Top
Hamra
Posted: September 20, 2016 09:02 pm
Reply to this postQuote Post


Newbie
*

Group: Members+
Posts: 3
Member No.: 40,247
Joined: September 18, 2016




K.E. and Tim, thank you.
PMEmail Poster
Top
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

Topic Options Reply to this topicStart new topicStart Poll

 


:: support us ::




ElectronicsSkin by DutchDork & The-Force