The One Chip Beeper In-Circuit continuity tester
Description and operation
The One Chip Beeper is an audible continuity tester. It works well in circuits that already have components installed because only wires and low value resistors will cause a tone. The One Chip Beeper will not turn on diode junctions or damage sensitive circuits. The one piece construction is compact and easy to use.
No power switch is needed due to its very low power consumption.
Use any 9 volt battery. An inexpensive carbon/ zinc battery will
last almost forever.
The entire circuit is built on a printed circuit board the size
of the end of the 9 volt battery. To do this, many of the parts must be
surface mounted. Standard through- hole parts are used by forming their
Packaging it up
By putting the beeper board on the end of the battery, you don't
absolutely need a case. If you want to put the beeper into a case, I suggest
using the box that bicycle patches come in.
|Open circuit voltage||250mv maximum.|
|Short circuit current||1ma maximum.|
|Threshold resistance||100 ohms typical.|
|Size||1.3" x .75" x 2.7" in optional case.|
|Battery life:||Over 2 years idling. (Limited by the shelf life of the battery).|
Order Part Number 12523
(pdf, 49k, June 26, 1999)
. Updated February 17, 2000
|Go to the Rho Enterprises home page|