Welcome, please log-in to participate in this (your) forum, by logging in you agree to abide by the rules of this forum.

Antique Radio Forum for Collectors
HomeHome  RegisterRegister  FAQFAQ  SearchSearch  Log inLog in  
The Forum is Now Easier to Navigate. We now Have Catagories then the related Forums.

Share | 

 Home built testers

Go down 

Join date : 2010-11-22

PostSubject: DIY cable tester- Easy one to make   2015-04-12, 7:10 pm

Take a panel or box and attach every type of connector you commonly use to it in pairs.
IE: 2 mono 1/4" jacks, 2 1/4" stereo Jacks, 2 RCA jacks, etc. You get the idea.
 Now you will need a pilot light socket for every conductor of the jacks. Put a pilot light socket in SERIES with one of leads coming from the connector. Install a 6.3V pilot light in the socket. Off one side of the other connection to the pilot light, again in series, put a 6.3V fil transformer or wall wart, and install a fuse in the secondary and a power switch in the primary. Fuse the secondary so that it is about 1/8 amp larger than the pilot light draws. This protects the transformer against shorts. You can also use batteries, but a 150 ma or larger pilot lamp is essential.

When you plug in a cable to test continunity you can wiggle the cable and see if the light goes out. If so, the cable has a
short or open in it.

Many commercial units only use LED's, but they will not truly tell you if you have a high resistance/ marginal connection, due to the fact an LED draws practically no current. A real pilot lamp will, due to its higher current draw.

You can test practically any cable you may run across with this device. (Yes, a IDE 50 connector will require 50 pilot lamps, etc.) Most of us typically would use it for coax and stereo cable continunity.

I have also built these units specifically for computer cables using the LED's to test everything from the 2 pin header conn to the IDE 50 conn, including cat 5 conn and telephone conn. Some even had selector switches and LED's that would tell you exactly which line in a cable was shorted to what other line. Sort of a "must have" back in the days of the  S100 computers when you assembled the cables by hand. (I just wished I had patented the unit I originally built, as a year later somebody else did).
Back to top Go down
Cliff Jones
Site Administrator
Site Administrator

Join date : 2010-11-22

PostSubject: Home built testers   2015-07-14, 9:45 pm

Making testers, help those who cannot find needed test equipment.
Good suggestion Frank!

I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
Back to top Go down
Home built testers
Back to top 
Page 1 of 1
 Similar topics
» dream of home being sold
» Bringing Home the Dharrma - new book by Jack Kornfield
» Last Wisconsin Guard unit arrives home from Iraq
» In house that doesn't feel like home, Dog, husband and son and fire
» When God Calls Someone Home

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench :: Test Equipment-
Jump to: