More praise for the QRP Continuity Tester
Don Smith, a high school teacher writes:
"The December 2004 issue of WorldRadio contained a set of instructions by Richard Fisher, KI6SN, for constructing a QRP continuity tester.
"I waited nearly three months before I tried to build the tester, and immediately wished that I had built it sooner. It works great. (SEE SCHEMATIC IN NOVEMBER 2004 ARCHIVE)
"I teach Physics in high school, and this has quickly become one of the most valuable devices I use in the classroom for demonstrating such concepts as the charging of a capacitor. I use a 1,000 microfarad capacitor, which causes the tester to buzz loudly when the charge is low, but gradually stops as the capacitor reaches its full charge.
"It's also great (as the article stated) for testing diodes and transistors. Another neat demonstration that I use in the classroom is to hold a probe lightly in each hand, which causes the tester to click slowly.
"When I squeeze the probes a little harder between my fingers, the click turns into a low growl, which proves that the human body does indeed conduct electricity. Thanks for a great little circuit. It's one of the reasons I subscribe to WorldRadio."
"The December 2004 issue of WorldRadio contained a set of instructions by Richard Fisher, KI6SN, for constructing a QRP continuity tester.
"I waited nearly three months before I tried to build the tester, and immediately wished that I had built it sooner. It works great. (SEE SCHEMATIC IN NOVEMBER 2004 ARCHIVE)
"I teach Physics in high school, and this has quickly become one of the most valuable devices I use in the classroom for demonstrating such concepts as the charging of a capacitor. I use a 1,000 microfarad capacitor, which causes the tester to buzz loudly when the charge is low, but gradually stops as the capacitor reaches its full charge.
"It's also great (as the article stated) for testing diodes and transistors. Another neat demonstration that I use in the classroom is to hold a probe lightly in each hand, which causes the tester to click slowly.
"When I squeeze the probes a little harder between my fingers, the click turns into a low growl, which proves that the human body does indeed conduct electricity. Thanks for a great little circuit. It's one of the reasons I subscribe to WorldRadio."
posted by Richard Fisher, KI6SN at 10:31 AM
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