Seems a lot of you feel that Breck is a JHS student. He probably even then knew all the things mentioned here. I sure did. It worked for him, so, he calculated everything correctly. It was a clever approach for his needs. 73 – Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
908-902-3831
From: [email protected] <[email protected]> On Behalf Of [email protected]
Sent: Tuesday, September 16, 2025 3:30 PM
To: [email protected]; 'B. Smith' <[email protected]>; 'Christopher Bowne' <[email protected]>
Cc: [email protected]
Subject: Re: [MRCA] Mystery Project
Keep in mind that a tungsten filament lamp has 10-12 times the resistance at normal operating temp as it does at room temperature, so can be used as a ballast/ current limiting some applications, but makes a poor dropping resistor. If it is AC, consider using face to face Zeners rated at the voltage drop needed, if the drop is small, series forward biased diodes can be used similarly. Make sure the current and power dissipation ratings are not exceeded.
Scott W7SVJ
From: [email protected] <[email protected]> On Behalf Of ac2eu--- via MRCA
Sent: Tuesday, September 16, 2025 8:43 AM
To: B. Smith <[email protected]>; Christopher Bowne <[email protected]>
Cc: [email protected]
Subject: Re: [MRCA] Mystery Project
Subbing the filaments with bulbs is a tricky proposition. They have to have the same current rating as the tube or the string voltage will be out of balance.
